Attic Fan Installation Cost (2026): Gable, Roof-Mount and Whole-House Fans

Attic fan installation is priced by fan type and the trades involved. A gable-mounted attic exhaust fan is mostly an electrical job; a roof-mounted unit adds roofing work; a whole-house fan adds framing and a ceiling opening.

What does an attic fan cost to install?

A gable-mount powered attic fan runs $300 to $650 installed. A roof-mounted attic fan runs $400 to $900 including flashing. A whole-house fan runs $700 to $1,800 installed. Solar-powered attic fans run $500 to $1,200 with no wiring but lower airflow.

What is included in each?

• Electrical: a dedicated or tapped circuit, a thermostat/humidistat control, and a manual override switch
• Roof-mount: cutting the deck, curb or low-profile mount, and proper flashing into the shingles
• Gable-mount: mounting to the existing louver opening, sometimes enlarging it
• Whole-house: framing the ceiling opening, damper box, insulated cover, and a wall control

What should the estimate flag about intake air?

A powered exhaust fan without enough soffit or intake venting will pull conditioned air from the house and can backdraft combustion appliances. Note the existing intake ventilation, and if it is inadequate, quote adding soffit vents as part of the job. This is the detail that separates a competent quote from a callback.

Roof-mount vs. gable-mount in the quote

Recommend gable-mount where a usable gable vent exists — it avoids a roof penetration and future leak risk. Reserve roof-mount for hip roofs or attics with no gable. Explain the trade-off in the estimate so the customer understands why you are steering them one way.

Example: gable-mount attic fan with new intake vents

Line item	How it's priced	Example
Gable-mount powered fan with thermostat	Cost + markup	$220
Mount fan at existing gable louver	Hours × rate	$180
Wiring and control	Electrical flat rate	$240
Add 4 soffit intake vents	Per vent	$200
Total		$840

Illustrative numbers only. Use your own rates, production times and local costs.

Attic access is a real cost

Attic work is slow when access is tight. A small hatch in a closet, low clearance, deep insulation and summer heat all add time. Many contractors schedule attic work early in the day in hot months. Ask for a photo of the attic access and note any access surcharge on the quote.

When to recommend passive ventilation instead

Not every attic needs a powered fan. A balanced system of soffit intake and ridge or roof vents can be enough. If the customer's main concern is heat or moisture, check intake and exhaust venting first and explain the options on the quote, including the risk that a powered fan can pull air from the living space if intake is inadequate.

Frequently asked questions

How much does it cost to install an attic fan?

Commonly about $300 to $650 for a gable-mount fan and $400 to $900 for a roof-mount fan, installed. Whole-house fans cost more because they need a ceiling opening and framing.

What's the difference between an attic fan and a whole-house fan?

An attic fan exhausts hot air from the attic. A whole-house fan pulls air from the living space through open windows and pushes it out through the attic, cooling the whole home.

Do solar attic fans need wiring?

No. Solar attic fans are powered by their own panel, though they usually move less air than wired fans.