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If you have a heating company and would like to be our page sponsor, we want to hear from you. This site is part of a large consumer tip site build and managed by internetWorld.ca Corp. Please go to www.internetworld.ca, go to the \"purchase ad space\". Your company logo, name as well as link through to your companies web-site will be inserted through-out. You can view www.calgarywaterheaters.com for a good example of this.


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Q=I hear a humming noise from my furnace when I try to turn the fan on, I notice a burnt wire smell ?


Your furnace motor has seized. As with everything else mechanical, your motor has reached the end of its life. You can increase the life of your furnace with regular maintenance and cleaning. Some furnaces have what is called a \"direct drive\" blower motor, this type of fan system has no belt. The other type is a belt driven motor. Our recommendation is to call our \"Service Expert\" listed in the web-site and with the numbers below. If you choose to try to do the job yourself. Parts can be found at most hardware stores. Be careful! and good luck..

A picture of a belt driven Motor

A picture of a directdrive motor, a very dirty one!



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My Fan Is Blowing, but air is very cold?


If your have good air-flow coming from the vents, but its cold, your furnace burners are not igniting.
Depending on the age of your furnace, IE; on furnaces before 1985 your thermocouple may be defective. Furnaces built after 1985 more commonly have an automatically lighting pilot. Most furnaces built since 2000 are either electronic spark ignition, or hot surface ignition. Trying to repair an automatically lighting pilot can be a bit of a challenge if you have never done this type of thing before. We recommend you call our “Service Expert” and let him know you have narrowed the trouble down to a non lighting burner.

“REBOOT” Your Furnace


Another quick assessment for you to try is turn the furnace power switch off for 1 minute. The power switch can be found in most cases just above or beside the furnace. Sometimes the main control board becomes “locked out” and will not properly send the right electric signals to the main components. Simply turn the power to the furnace off, wait, and turn it back on. Simply turning the thermostat down will not do the trick. You must turn off the power.

Dirty Filter


Furnaces build since year 2000 are most prone to shutting off when a furnace filter becomes to dirty to properly allow air-flow. Simply remove the filter, replace with a new one, turn the main power off for 1 minute, turn on.

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How Often Should I Change/Clean My Filters?

All forced air furnaces should have an air filter installed just before the cold-air return supply reaches the blower motor. It is recommended that during times of continued fan use, you should clean your filters every 30 days. There are several different types of filters. The standard filters are the basic minimum and will help to keep the larger dust partials from getting in the fan. The slide in filters come in many different sizes and types. If you purchase a filter that claims to remove fine dust partials, be sure to replace your filter more frequently as the more dust it catches, the faster it will become dirty there-by restricting air-flow.


Another air cleaning system is the electronic filtering systems. They are located on the side of the furnace close to the blower motor. These filters have “cells” inside that can be cleaned and reinserted. Follow manufactures recommendations for cleaning.
Other types are of the “Hepa” type. This type of filter system should only be used as a secondary to the ones mentioned above. Hepa filters units also can be purchased with a carbon filter installed along side the Hepa filter to remove odours from the air.


Basic Type of slide in Filter
Dense slide in type
Electrostatic Type
Electronic Type
Hepa Type


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My Thermostat doesn't seem to keep proper temperatures like it use to. Why?

If you have a battery operated thermostat, it may be time change your batteries. Change the batteries once a year to avoid problems.
If your thermostat is wired direct to the furnace, and the power is on, you may have a dirty or plugged sensor located inside the stat itself. Vacuum around the fins that you should see on the sides of the thermostat housing.
If you have a basic stat that is operated with a sliding trigger, your calibration of the inner workings need adjustment. This can be done with a small wrench that is shipped with the thermostat when purchase. Simply measure the room temperature with a trusted sensor, then carefully adjust the slider to match the readings on the stat.
If you have a programmable thermostat, make sure the proper settings are set for the times you are home. Check the manufactures manuals for how to change batteries or program your stat


Battery Type Stat

Fins can be seen in this picture. They should always be clean

Areas to adjust your programs may look like this

Old Style Basic Sliding Type

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Carbon Monoxide Is A Killer

Carbon Monoxide

Every year many people are poisoned by this dangerous tasteless,odorless gas. Death to animails and humans is a very real danger. For this reason it is common sense that unqualified persons should never work on gas fired appliances. Always insist that any service personal have proper certified training to work on your gas appliances!


Symptoms Of CO. Poison At Work


The most common symptoms of carbon monoxide poisoning may resemble other types of poisonings and infections, including symptoms such as headache, nausea, vomiting, dizziness, fatigue and a feeling of weakness. Infants may be irritable and feed poorly. Neurological signs include confusion, disorientation, visual disturbance, syncope and seizures


What to do if you suspect CO poisoning

If you experience symptoms that you think could be from CO poisoning: DO GET FRESH AIR IMMEDIATELY. Open doors and windows, turn off combustion appliances and leave the house. DO GO TO AN EMERGENCY ROOM and tell the physician you suspect CO poisoning. If CO poisoning has occurred, it can often be diagnosed by a blood test done soon after exposure

Official recommendation: concentration levels should be below 30 PPM average exposure.
30 PPM Permissible Averaged over 8 hours 200 PPM Maximum for acute exposure 800 PPM Lethal < 2 hour exposure



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I have several grates on the walls through-out the house. Some are wider than others. Can I block them off?


No, These grates are most likely the return air registrars to your forced air furnace. The furnace needs to pull air from rooms through-out the dwelling down into the furnace to heat as needed then return it to the rooms via the hot air portions of the duct-work. Anytime you plug off theses vents, even just one, you restrict the airflow, this will cause the furnace to work harder, waste energy, and decrease the life of the furnace. Having a couch blocking a grate, or a large dresser blocking the grate is a no no. Always leave room between any furniture and the grates for good air flow.


Cold Air Return Duct

Cold Air Grate

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Q=I hear a growl sound from my furnace, it started out as a minor squeak, but has gotten progressively worst, what can I do?


What your hearing may be the belt (assuming its a belt drive motor) or the bearings on the blower wheel. Other problems are on direct drive blowers, the wheel may have came loose and is rubbing against the blower housing. Its best not to use your furnace until you get this repaired. Repairs consist of replacing the bearings, belt, or even the complete blower assembly


Belt Drive Blower

Healthy Direct Drive Blower Wheel



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A few pictures below of dirty ducts in Calgary.






This is just one of the tools used for cleaning ducts and pipes of your heating system.





Dust Mites, cleaning your heating system will help keep the mites under control.




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One of many types of Octopus furnace grvity fed heating systems

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Forced Air Furnace

Since 1935, forced air furnaces have been the main source of heating in many homes across north America. As of 1999, New furnaces installed in Canada must be of the high efficient type. The energy rating on the high efficient furnaces are often higher than 85 % and in most cases in the low 90% percent range. You can recognize a high efficient furnace by looking for the condensation drain hose. The need for the drain hose is related to the removal of what was previously wasted “heat energy” from the chimney gases. The venting of high efficient furnaces is now a special grade PVC as opposed to the tin style of previous out-dated types.
You will notice a label on your furnace similar to this one:


Be sure to ask your Service Expert about the government rebate programs in place to retrofit your forced air furnaces with new high efficient models. In Alberta, the rebate information can also be found on http://www.climatechangecentral.com
A great source of information related to the reliability and types of high efficient furnaces can be found by clicking here. Permits and Regulations Of New Furnace Installs
In most major city's in Canada, municipal regulations required a permit for all new furnace installations. You should call your local City Information Line for information as to what type of permits are needed. Having a permit and City Inspection of any work completed in your home is one way to make sure no corners were cut during the installation of new furnaces and related equipment.

Brands Of Furnaces

American Standard American Standard manufactures and markets central furnaces that are available in single and multistage configurations, some models are said to be capable of an AFUE rating of more than 90 percent. Units do meet Energy Star requirements.
Armstrong
Armstrong is a brand you may have in your home, the company was purchased by Lennox in 1988.
Bryant
Bryant manufactures and markets gas central furnaces that are available in single and multistage configurations, Bryant has models capable of an AFUE rating of more than 90 percent. Bryant markets units that meet Energy Star requirements.
Carrier
Carrier is another leading manufacturer and marketers of gas central furnaces. Carrier central furnaces are available in single and multistage configurations. Carrier has some models capable of an AFUE rating of more than 90%. Carrier markets units that meet Energy Star requirements.
Lennox
Lennox is said to be the first to market a forced air furnace. They are also a leading manufacturer and marketers of gas central furnaces. As with most brands of furnaces, Lennox central furnaces are available in single and multistage configurations with some models capable of an AFUE rating of more than 90 percent. Lennox markets units that meet Energy Star requirements.
Rheem Rheem manufactures and markets gas central furnaces that are available in single and multistage configurations. Some models are said to be capable of an AFUE rating of more than 90 percent. Some units meet Energy Star requirements. Rheem products are made by the same manufacturer as Ruud.
Trane Trane is another leading manufacturer and marketers of gas central air furnaces. Trane central forced-air furnaces are available in single and multistage configurations. Models capable of an AFUE rating of more than 90 percent.
Other Brands Arcoaire, Clare, Comfortmaker, Dettson, Heil, KeepRite, Lincoln, and Tempstar. are all owned by International Comfort Products.
Goodman Goodman makes residential and commercial heating and cooling equipment. Goodman owns the Amana, Janitrol, Goodman and GmC brands of HVAC equipment. Goodman is privately owned and headquartered in Houston, TX, USA.


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Examples and meanings of common energy labels.

Much the same with all appliances, you will find a label with information about that products energy performance.

EnerGuide


The energy efficiency of all natural gas furnaces is measured by a symbol that relates to the AFUE -- annual fuel utilization efficiency information. The higher the AFUE number, the more efficient the model. High-efficiency furnaces have AFUE ratings of 88 to 97%, whereas the now discontinued in Canada mid-efficiency furnaces range from 78 to 82%. You’ll notice that there are labels on new furnaces. One is the EnerGuide label. This label is on every furnace, it tells you in very simple terms what the furnace’s AFUE rating is. Keep in mind that just because a furnace has an EnerGuide label it does not necessarily mean that the furnace is energy efficient, it simply means it has been tested.


EnergyStar


You may see another label on the furnace that has an ENERGY STAR® label on it, it means that it is an excellent energy wise choice. Based on EnergyStar criteria, only furnaces that are exceptional in the area of energy efficiency (AFUE rating of 90% or more) earn the ENERGY STAR label. The ENERGY STAR mark is administered and promoted in Canada by Natural Resources Canada and is registered in Canada by the United States Environmental Protection Agency.
When looking for a high efficient furnace, you might also want to consider an ENERGY STAR programmable thermostat.



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Rebate Programs


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Q= I Smell Natural Gas In My Furnace Areas, What Should I Do?


ANYTIME you smell Natural Gas in your home you should call the gas company and make arrangments for them to inspect the leak source. If any problems are found, you may be required to call a Service Expert to come in and make the repairs necessary. Problems like gas leaks do not correct themselves. It’s very important that you be proactive to have the gas leaks repaired in a timely manner.


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Furnace Sizing


In most cases when changing the old furnace over to the new models on the market today, you will not need a furnace with the output of your current furnace. Over the years it has become apparent that most furnaces in Canadian houses are oversized. A properly sized furnace and properly sized duct system is where a furnace installer professional is king. Having a furnace of a correct size will result in efficient operation during the whole heating season. A grossly oversized furnace will run only for a short period, never coming up to peak efficiency. Note, however, that sizing may not be a big issue with high-efficiency, condensing gas furnaces. Due to the design of condensing appliances, they are efficient even when oversized.
So, how do you size your furnace? You can have the contractor use a home heat loss calculation that is available from Canadian Standards Association (CAN/CSA F280) or a sizing procedure from the Heating, Refrigeration and Air Conditioning Institute of Canada (HRAI). Having a proper sizing will cost you $150 – $300 from a qualified contractor.



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What are the Different Types of Air Cleaning Products?


There are many different types of products you can use either as a stand-alone room air cleaner, as we well as a whole house air maintenance system. Studies have shown that while all air cleaners have some success with cleaning the air borne particulates, that the best results are from having more than one type of air management system installed for the best broad range of cleaning.


Hepa Filter

Hepa stands for High Efficiency Particulate Air, a true Hepa filter is regarded as the ultimate filter. The history of the Hepa stems from the ww2 days when the Atomic Energy Commission required a filter to protect staff from radioactive dust. That was the first and as far as we can tell the birth of Hepa. A Hepa is capable of removing .3 microns with efficient rating of 99.97 %. You may wonder, “What is a micron?” Simply put, a micron is 4/1000, 000ths of an inch or for metric, 1 millionth of a meter. Pollens range between 5 and 100 microns, human hair about 70 – 100 microns. A Hepa filter will only allow 3 particles to flow through for every 10,000 that enter the unit. (within the filtering range) If you are shopping for a Hepa, be sure to check the filter ratings as some Hepas are not “true” Hepas.


Ultraviolet Irradiation lights

UV lights sterilize the air that passes through UV lamps via forced air. These lamps are great when installed properly for keeping cooling condensate pans sterile as well as when installed in duct systems, they are great for killing virus and bacterial contaminates. Having a good filter system to remove the dead contaminates is also recommended to take care of the cleaning part of air management.

Activated Carbon

Known for its absorption ability, this type of filter is usually used with the Hepa filter system. This type of filter is great for removing volatile chemicals on a molecular basis. Keep in mind it will not remove the larger partials.


Ionizer Purifiers

Ionized Purifiers work by using charged electrical surfaces or needles to generate electrically charged air or gas ions. These Ions attach to airborne particles which are then electrostaticly attracted to a charged collector plate. This mechanism produces trace amounts of ozone and other oxidants as by-products. Most ionizers produce less than 0.05 ppm of ozone, an industrial safety standard. There are two major subdivisions: the fan-less ionizer and fan-based ionizer. Fan-less ionizers are noiseless and use little power, but are less efficient at air purification. Fan-based ionizers clean and distribute air much faster. Many people have installed this type of filter in their homes and are permanently mounted home electrostatic filters.

Electronic Air Cleaners

It is very common to fine electronic air cleaners in stalled in many homes. These units can be recognized by 2 cells that produce a “snapping” sound when they are working. Many people have became annoyed by the constant snapping and have turned the units up, leaving the home with no air management.


Ozone Producing Air Purifiers

Most air purifiers produce small amounts of Ozone. Ozone is not considered safe to breath in large volumes. Ozone generators are specially designed air purifiers that are used to remove the strong odors such as smoke after a fire, or the smell of decaying flesh, or mold and musky smells after a flood.


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What Can I Do To Cut Down On Maintenance Cost Of My Heating System?


It’s important to start off by saying, “You Should NEVER allow anyone who is not trained, to service ANY gas appliance. Your furnace being one of the most dangerous appliances in your home is no exception. Death and Damage are a very real concern. You can help keep your heating system running properly with a few simple tricks. By doing simple things like keeping the furnace filter clean, making sure any person that touches your furnace is trained to do so. Have regular tune ups (once a year) and you will enjoy a safe 25 to 30 years of trouble free heating.



Simple Things You Can Do


1) Never run your furnace without a filter. Always make sure your filter is never overly dirty. Change or clean it often.
2) Have the moving parts such as the fan motors lubricated at least once a year. Have a qualified furnace service tech come in and service your heating system should include this.
3) Regular duct cleaning to keep the system as clean as you can with prevent overheating, and overworking of your furnaces main components.

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Plastic venting is largely an issue in Ontario, and having the law passed in that province that would require the fuel source to be cut off from any home that has not replaced the plastic vent the issue should be taken care of by now. However, things to look for are:
Plastic exhaust vent pipes labelled Sel-Vent, PlexVent or Ultravent. (or any vent other than those in service on high efficiency furnaces, which are labelled ABS, PVC or CPVC, and are acceptable)


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Smells from furnace


Funny smells coming from your furnace are from debris or dust on the heat exchanger in the furnace. Drip pans will cause condensation “slime” build-up during the cooling season from condensation on the a/c cooling coils. Dust build=up over the warmer months on the furnace will also start to burn during the beginning of the cooler months. Having your furnace cleaned by a professional will help reduce this funny smell issue.


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Banging Noise In Duct Work


Q = “After my furnace is running for a few minutes, there is a loud banging noise that seems to come from the ducts. The noise occurs every 5-10 minutes when the furnace is running.”
A= Sometimes the duct can expand and contract. When they heat up a little they can 'pop' like a plastic bottle that you have crushed the sides of. Put a little air pressure on it and POP it goes to the expanded mode. When it cools off it probably does the reverse and bangs again when it contracts and it falls back to a smaller volume. Sometimes you can find the general area that the banging is coming from, and try to put a dent in the duct work, to give it a bit of a “kink”. This has been known to stop the banging due to the issues as mentioned above.


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Heat Recovery Ventilator


How it works

As shown below, a heat recovery ventilator (HRV) consists of two separate air-handling systems – one collects and exhausts stale indoor air; the other draws in outdoor air and distributes it throughout the home. At the core of an HRV is the heat transfer module. Both the exhaust and outdoor air streams pass through the module, and the heat from the exhaust air is used to pre-heat the outdoor air stream. Only the heat is transferred; the two air streams remain physically separate. Typically, an HRV is able to recover 70 to 80 percent of the heat from the exhaust air and transfer it to the incoming air. This dramatically reduces the energy needed to heat outdoor air to a comfortable temperature.


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Service Expert Required!


We are currently taking consumers service calls and dispatching quality Licensed Edmonton Furnace Service Technicians. If you own or know of a quality Service Contractor in your area that would like to be our Service Expert, please have them Call Ron 780 800 9302 or 403 589 0711

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No Heat?
Top Three Things That Can Go Wrong

1) Plugged Furnace Filter
2) Blower Wheel Issues
3) Thermocuple or Hot Surface/flame sensor malfunction as shown below

The author and founder of this consumer web-tip site has nearly 3 decades of service to homes in Calgary Alberta. During his time, he has found that the following three things were the casue of furnaces having a break-down.

1) Plugged furnace filter. Your furnace filter must be clean or the furnace will over heat due to overly restricted airflow. This is a dangerous situation if your furnace has shut down due to this issue. What has happen is the safety device inside your furnace that is preset to shut the gas off at about 250 - 300 degrees F has done its job. The danger for all the dust and debris igniting and starting a fire is a very real concern. Simply change your filter, then reset your furnace by turning the power off and then on again a few minutes later.




2)Blower Motor Issues Your blower motor or the belt that drives the blower wheel may have broken down. On belt driven blower wheels, your belt can snap and stop moving the wheel. The belt can be changed without a whole lot of trouble is your semi mechanically inclined to do so.


Other furnaces have a direct drive blower motor. There are no belts, if the motor has stopped working, your best to call the furnace repair company listed through-out this web-site for help.

 

Below Is A Dirty Direct Drive Motor


3) Pilot Light Gone Out Or Wont Light. The third most common issue with no heat is the fail of the pilot assembly. There are many different types of pilot systems from standing pilots that are always on burning gas when needed or not or the auto ignition systems that use either a sparker, or hot surface igniters. The new furnaces have a flame sensor that is part of the pilot system that is a very common part to fail the ignition of your furnace.

Thermocuple found on the standing pilot systems as shown below



Standing pilot with a regular type manual lighting pilot, and a auto spark type ignitor



Hot surface ignitor the is used with a flame sensor as shown below


Flame Sensor


ITS very important to remember the simplest thing and the most important thing you can do to keep your furnace running trouble free is keep the filter clean. Change it every 30 days during the seasons you use the blower. If you use the summer fan features during the summer, you still need to change the filters every thirty days.



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Natural Gas Leaks and Information

Natural gas is an energy source that is commonly used in homes for cooking, heating, and water heating. Natural gas that is used in our homes is clean methane with an additive of “Mercaptan” to give it that rotten egg odour. This odour is added to give us a very definite clue that we have a natural gas leak for obvious reasons. In many homes, steel pipes are used to connect our gas appliances to the gas supplier’s pipe line. Gas codes and regulations also allow certian types of copper tubing, as well as newer materials such as \"Tight Flex\". If you have noticed a faint smell of the gas, it’s important that you act on it and have a professional look at your gas pipes for leaks. A reputable gas detection company will have a licensed gasfitter with the proper gas detection equipment to properly locate any leaks you may have. Often, your gas utility company will come out to inspect your gas piping system and in some cases at no charge to you.
Other types of sources of gas leaks can be the initial start up of a gas appliance such as a water heater, or your furnace. This is also a concern as the appliance design is as such to prevent the spillage of gas into the room on start up. You are advised to call a qualified gas appliance service person to inspect why the gas is accumulating before ignition.



A faint smell of gas is a concern, a strong smell is a warning to;
1) DO NOT light a match, turn on the lights, use the phone, as a spark is all it takes to cause an explosion.
Leave the house.
2) DO call your utility company or service company and request a qualified gas fitter to come out to inspect.


Steel Gas Pipe Picture


Tight Flex Gas Tubing


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Humidity and Your Home



Most Canadians know that to much or to little humidity in your home will leave you feeling uncomfortable.


Two Types Of Humidity problems

  Too much humidity in Your Dwelling   Too little humidity In Your Dwelling  
Typical symptoms 
  • Excessive condensation on windows 
  • Patchy wet stains on walls and ceilings 
  • Moldy bathroom 
  • Musty smells 
  • Allergic reactions 
  • Chapped skin and lips and dry hair 
  • Scratchy nose, sinuses and throat 
  • Breathing problems 
  • Static and sparks 
  • Problems with electronic equipment 
Long-term effects 
  • Damage to the house and its contents 
  • Ongoing allergies
  • Other health problems 
  • Continuing discomfort 
  • Damage to furniture, hardwood floors and other items 
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Adding Humidity To Your Dwelling



Humans control their body temperature mainly by sweating and shivering. The United States Environmental Protection Agency cites the ASHRAE Standard 55-1992, Thermal Environmental Conditions for Human Occupancy, which recommends keeping relative humidity between 30% and 60%. At high humidity, sweating is less effective, and we feel hotter. Air conditioning works by reducing humidity in summer. In winter, heating cold outdoor air can decrease relative humidity levels indoor to below 30%, leading to discomfort such as dry skin and excessive thirst. In homes that are on the prairies, the dry air can be a brutal uncomfortable thing. In newer homes, the construction is much tighter, locking in air and humidity from cooking, showers etc. Regulating the humidity is even more important to prevent over humidification. Newer homes have fans through-out that can be turned on to rid the home of excess humidity. Heat recovery ventilators are another great way to control humidity and save money by extracting the heat from the inside air and reheating the new outside air while dumping old air outside. Most people in areas on the prairies require a humidifier in the winter time to increase comfort levels. Room humidifiers and whole house humidifiers are common. Steam humidifiers are becoming more popular to prevent the waste of water being lost due to flow thru and leaking drum type humidifiers.

Types of humidifiers that will work well if used for the intended design.

Steamer Type

Having one of these installed requires proper water treatment before the humidifier. In many cases, “Reverse Osmosis” is used to clean water of hard water partials. This is done to prevent rapid scaling up of the humidifiers. Advantages of this type are fasted humidity into the home even when the furnace burners are not on. Disadvantages are the units are 110 or 240 v powered. So operation cost is higher than the other whole house units.


Whole House Steamer


Flow-thru Type

These units are fairly common. However, the consumption of water that is needed is high. They must have water flowing over a pad that is inside the humidifier. If the air isn’t heated, the amount of humidity given is greatly reduced. Some installs have used the water from the hot water tank to try and get better vapour released during a sudden warm dry winter spell.


Flow-thru type



Portable Humidifiers

These units are great for smaller rooms. It’s important to keep these units clean to prevent bacteria build-up.


Travel Type Great For Hotels and Other Dry Stays





Room Type



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Dehumidifiers


As you probably already know, a dehumidifier is an appliance that removes humidity from the air. Areas of Canada close to the oceans or large bodies of water will be candidates for de-humidifiers. Large portable dehumidifiers are also used in flood clean-up to remove dampness from the dwelling after a major water leak or flood. On the prairies, your most likely only going to see a dehumidifier if you have had a flood in your home or office.
In addition to human comfort, removing the humidity from the air is required is to prevent damage from molds as well as to prevent stains on the walls and other construction related issues. Insects are also attracted to high humidity areas. Moths, clothes, fleas, cockroaches to name a few are likely to be found in areas of consistently high humidity.

Homes with air conditioners also will enjoy the dehumidification of the air at the same time. As the hot humid air comes in contact with the air conditioner coil, the air condensates, this water is then captured and drained off by the air conditioner pan.

Below are a few pictures of dehumidifiers.

Whole House Type




Porable Type




Large Scale Type for Pool and Other Like Areas




Types used for flood clean-up



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UV-Lights In Furnaces and Ducting Systems


Properly installed UV lights will help get rid of the mould spores as well as most of the viruses, bacteria’s, air-borne pathogens. Issues with them burning out on some models can be expected. Making sure your filter system is cleaning the air will help keep the UV bulb clean and free to do its job. If the bulb is dirty, the killing power drops off dramatically. There are different sizes of UV bulb that are to be matched with the size of the dwelling you’re treating. If you have an air-conditioning coil in your furnace, properly installing a UV light will help keep the mould from taking hold in and around the condenser coil. There are reports that the amount of UV a typical residential lamp sold for many homes is enough to directly kill the mould. Studies have shown that the UV lights need to be clean, and installed properly. Then, the UV lights will make mould spores sterile so the reproduction of moulds eventually is hindered to the point of greatly reducing or in some cases eliminating the moulds.


Bottom Line
The UV lights are great if you install them in the right places, have a clean filter to keep the UV bulb clean. They do not kill the actual mould unless you have industrial grade UV lights installed. They do kill spores, which take away the ability of mould to reproduce. They need to be properly sized for your home.



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