Attic Cooler Than House

In contrast whole house fansare most effective in the cooler temperatures of the evening and early morning.

Attic cooler than house.

Which way does your house face. In many houses it is impractical to increase the insulation in the attic. Attic fansare most effectiveduring the hottest part of the day and they are usually controlled by a timer thermostat 2 or humidistat. So everything else being equal any house would benefit from a cooler attic.

The obvious benefit of increased ventilation in the warmer months is a lower attic temperature which can decrease cooling costs in the home. The third graph shows attic temperatures from the middle of the attic for several different types of roofing as well as a sealed attic. In summer the ideal is to have lots of air movement so the attic is as cool as possible. The ideal temperature outside is at least 5 degrees fahrenheit below the desired indoor temperature.

Insulation can only slow and not stop the energy transfer. Regardless of what the insulation level is there will be some level of energy transfer from the warmer attic to the cooler house. Proper attic ventilation has year round benefits. The result is a cooler attic space with plenty of air exchange.

Maybe but not always. Attic fans perform this ventilation by pushing hot air out into the environment while also pulling fresh cool air into the attic.