Grass Allergies
Whole house fans are fans mounted in the ceiling that draw air up and out of the house to lower the temperature and circulate the air. These fans are often used in the place of air conditioning because they can lower the temperature by several degrees for a much lower cost than most air conditioning units.
Grass Allergies
They're different from attic fans which are designed to vent the attic of a home. If you use a house fan, you will also need to have an attic fan or some type of adequate venting to allow the hot air pulled out of the house to escape the attic. If you don't have adequate venting in the attic, the hot air that's pulled into it will cause condensation and moisture problems that will damage your home.
Grass Allergies
These fans cost much less to operate than air conditioning and often cost less to purchase and install, but they do have some disadvantages. Whole house fans typically can't cool as efficiently as air conditioning. In extremely hot weather, the temperature inside the home is still going to be very warm. With air conditioning, you can set a temperature as low as you choose and reach it. That's not possible with a fan of any kind.
Grass Allergies
Also, if allergies are an issue then air conditioning is by far the better choice for cooling a home. House fans work pulling hot air up and out, which only works efficiently if windows are open and allow air to be pulled in from outside. When air is pulled through an air conditioning unit, it goes through a filter that can trap some allergens and irritants. Air that a house fan pulls inside comes in directly with no filtering, and will contain pollen, mold, grass and other common problems for allergy sufferers.
A third disadvantage to whole house fans is the noise. Even some models designed to run quietly are loud enough to be intrusive in everyday activities. If the fan is mounted in a high ceiling or a place where noise isn't a problem, you don't have allergies and you don't need the house to be extremely cool in the summer, a house fan could be a budget-conscious choice.
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