What size Air Conditioner Furnace does my House Require?

Many factors are involved when determining what size air conditioner or furnace would have the required power output to cool or heat your home.

What size Air Conditioner Furnace does my House Require?

These factors include the extent of exposure to the sun and the outside air, the thickness and type of outside wall insulation, the size, type and number of windows and outside doors, the ceiling height, etc.

Generally speaking, however, if you live in the Greater Toronto Area or Southern Ontario, you may use the following charts to estimate the correct size of the heating or cooling product that you may need for your home. It is very critical in the installation of furnaces and air conditioning systems that you are recommended the right size unit most suitable for your home. Under- or over sizing can cost you performance, comfort and efficiency related issues when it comes to both the furnace and the air conditioner. Under sizing will, of course, result in the unit being unable to meet the desired temperature setting. Aside from the issue of your comfort, under sizing the equipment and/or material will most likely lead to the premature failing of the units. This being said, it is as important to make certain that the units are not oversize, either. It is rather a quite often observed misconception of consumers that the more powerful the furnace or the air conditioner, the better heating and cooling performance that will be achieved.

* The above square footage do not include the area of the basement

Over sizing a furnace will result in many different shortcomings. First of all, what is most important in having a uniform distribution of the warm air is the optimum run time of the furnace. The same statement is also true for an air conditioning unit with respect the uniform distribution of the cool air. When going with a more powerful HVAC unit, it will satisfy the temperature setting quicker than when it should and it will not run that optimum length of cycle for you to have a uniform temperature everywhere in your home and the existence of those hot and cold spots in the house is inevitable in that case. With an over sizing of the gas furnace, there also exists a great chance for the overheating of the furnace. This is mostly caused because in the case of over sizing of a furnace, the existing ducts in the home will not support such high volumes of air flow causing pressure build-up in the return air duct and therefore overheating. Also, do keep in mind that the maximum level of efficiency with the gas consumption of a gas furnace is achieved when the right size furnace is installed in your home. In fact, the right size furnace should almost continuously run during the coldest day of the year. Of course, it should be able to satisfy your desired temperature set point.

Keep in mind that the following furnace output power estimates are aside from the furnace’s nominal power ratings. For example, a 95% rated efficiency furnace with a power rating of 80,000 BTU/hr has a power output of 0.95 x 80,000 BTU/hr = 76,000 BTU/hr.

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