Whole House Fan – Q & A

What is the advantage of a whole house fan?

There are two types of fans which are often confused.  In the roof of your home you should have an automatic thermostatically controlled attic fan.  When the attic air reaches a preset temperature of about 95 degrees, the fan will turn on and exhaust the hot air through the roof.  It also creates a negative pressure at the soffit vents and gable vents, which brings in fresh outside air.

The whole house fan is located in the ceiling beneath the attic and is manually controlled by a switch.  This fan will draw fresh air in from open windows on your lowest level and pull the stale hot air near your ceilings up into the attic.  Simultaneously, the now pressurized attic will have its hot air pushed to the outside of the house.  You get two cooling effects from one fan; the inside of the house and the attic temperatures are both lowered.

We recommend a whole house fan for good air circulation and the prevention of humidity and moisture accumulation.  Just remember to always keep several windows open while the fan is running.  Be careful not to create negative pressure in the conditioned living space.  This could potentially blow out pilot lights on gas appliances or heating equipment.  We find that running the fan for 10 minutes before turning on the AC helps cool the house down much faster.  Just remember to turn off the whole house fan!