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Question DetailsAsked on 7/30/2014

How much should a whole house fan cost to have someone install it?

I'm looking to Install a whole house fan and was wondering what's the cost of installing one for an 2 story home? Thanks in advance

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Voted Best Answer

Whole House Fan" has two meanings to different people - some use it for a large attic fan to cool the attic over the whole house or to suck air out of the living space at one point, others for a ventilation-only fan that moves air through the entire house including vents in each significant room.

Here is a link to a similar prior question for a single fan with single collection point like an attic fan or hall-vent fan -

If you meant a true "whole house fan" which draws air from all major rooms, that can run from $1500-2000 in the easiest case with easy access for vents in 2nd story ceiling from open attic and through floor vents from open basement or crawlspace for bottom story, to as much as $2-5,000 for one where ducting has to be installed in existing walls and floors. For the latter type system, cost is held down in many cases by putting it in existing HVAC ducting if available - though requires installation of some specific safety measures so it cannot run when the furnace is active because it will "pull" the flame out of the firebox (gas or oil heat) into and damage the furnace and pose a fire hazard - so it becomes a seasonal use only item. Generally, if you want whole house ventilation available on a daily basis including during times when the furnace might be running also, then that is handled by installing a larger capacity variable-speed fan on the furnace which can move air through the ducts in either furnace, A/C, or air-only mode, and generally has to come with the furnace - not as a retrofit, though that can be done in some cases.

You will need to consider if you want to try to install in existing ducts or not, have only one draw point (commonly top of cathedral ceiling or upstairs hall) or many, etc - then get quotes from Heating and A/C contractors - one good one you like might work for a single-point install - I would recommend three if talking new ducting or a major in-duct modification job.

Answered 6 years ago by LCD

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