During the design phase of their home, new home builders should consider a constant circulation of air throughout their home. We obtain fresh air from a number of sources; however, stale and stagnant air can still occur, especially during the prime heating and cooling months of the year.
Since mould is caused by lack of air circulation and the presence of moisture with a nutrient base, homeowners who are susceptible to allergies may want to consider running their furnace fan on a 24-hour basis. New homes also exhaust various gases from rugs, walls, paint and furniture. These gases combine to form a pollution levels in your home sometimes more than 100 times that
of the outside air.
Forced air systems will circulate air throughout the home while drawing air in from the outside through windows, chimneys, and exhaust vents. Homes that rely upon baseboard electric convection heaters or baseboard hot water heaters, do not circulate air throughout the entire house and do not draw
fresh air into the home.
Air temperature in a home will vary constantly, particularly on very cold days. Drafts from windows, skylights or unheated rooms will also occur as the cold air sinks to find the lowest level. The location of your thermostat will determine how often your furnace will cycle on and off. Extreme
factors such as being close to a window or draft area or even a hot air vent will affect this. As your house cools from the last on-cycle of your furnace there may be a period of time when the temperature in your home feels uncomfortable and cold.
Air temperature levels in your home can be improved and more uniformly
maintained by having your furnace fan run constantly. This forces air throughout your home on a constant basis and avoids those cold air pockets. Air in rooms warmed by the sun is moved to colder areas of the house, saving energy. Constant fresh air circulation replacing the pollutants in your home is another advantage.
the positive benefits of continuous air circulation include better air quality and a more comfortable constant air temperature, the constant flow of air requires the furnace fan to use more electrical energy. Consumers should consider the various types of electrical motors that are available in forced air furnaces and make this selection at the time of installation. Furnaces with lower electrical ratings use electronically commutated motors (ECMs). ECMs, sometimes referred to as brushless DC motors, are somewhat
more efficient than a standard blower motor.
To summarize, constant airflow will increase the amount of fresh air in the home, it will reduce drafts, move sun-warmed air into other parts of the home and provide a greater level of comfort to the consumer. Electrical usage operating costs will increase; however, the
increased cost can be controlled by selecting an ECM or brush less DC motor.