Attic Fan Installation Cost: Roof-Mount, Gable, and Whole-House

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.