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Question DetailsAsked on 4/17/2015

What type of service would install fan in my attic to help send the heat that is conducted through the roof outside

I have a southern facing house. In the summer a lot of heat is conducted through the roof. What service would install an attic fan to send the heat back outside.

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Power exhaust fans are not the way to go , to reduce the attic temperature.

First they will use enough electricity ,to eat up the savings on the AC system from a lower attic temperaure.

They will not pull the heat out evenly, meanig the air they exhaust will come from "the path of least resistance" in the attic. So they will cool some areas much more then others.

If you don't greatly increase the size of the vents in your eves so air can flow in, they will put the attic under negative pressure, and actually pull conditioned air from inside you home. There are many small paths through walls and fixtures that will allow air to be pulled out.

Google Ridge Vents, and read abot ventilating your attic with them. Or install multiple vents in your roof. Ask a roofer about these. As the attic heats up,warm air rises and escapes throuh the vents. Best way to ventilate an attic.


Answered 5 years ago by BayAreaAC


Bay AreaAc is right on the mark about powered fans being a last resort - for many reasons.

A couple more things in addition to what he said - The fan will pull mostly from the stud bay it is installed in, plus some from the two adjacent ones - but unless a full-flow gable vent (blowing horizontally through the attic) they only ventilate a narrow with of the roof.

You best bet, for a normal gabled roof sloping down away from ridge(s), is eave vents combined with ridge vents, which are not difficult to install as a retrofit on houses that do not have them, and provide year-around passive (no power) ventilation of the attic, so not only remove heat in the summer but also ventilate moisture form the attic in the winter. Lots of discussion on the attic ventilation/insulation issues in the Home > Roofing and less so in the Home >Insulation links in Browse Projects at lower left. Flat roofs your choices are a lot less.

BTW - contractor for ridge vents is Roofing, for powered roof vents usually Heating and A/C but some roofers do it also, though they will likely sub out the electrical part or ask you to get that run.

Answered 5 years ago by LCD

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