ATTIC VENTILATION
How to Estimate Attic Fan Installation
Contractor method to estimate an attic fan by fan type, CFM, thermostat and labor with clear materials and labor lines.
An attic fan moves hot air out of the attic, and the price depends on the fan type, the CFM you need and the wiring. A roof-mounted fan also means a cut in the roof that has to be flashed. This guide covers sizing the fan, choosing the type, and quoting the wiring and the roof work.
THE SHORT ANSWER
How to Estimate Attic Fan Installation
A gable fan at 1,500 CFM with thermostat and 6 labor hours at $75 totals about $890.
Size the fan to the attic
Price by the CFM the attic needs, which comes from the attic area. An undersized fan moves little air; an oversized one wastes energy.
- Fan type
- CFM
- Thermostat
- Labor hours
Roof-mounted vs gable
A roof-mounted fan needs a roof cut, flashing and weather-proofing; a gable fan mounts in the wall and is simpler. Match the type to the attic.
Thermostat and wiring
A thermostat turns the fan on by heat, and the wiring has to reach a circuit. Confirm the electrical work separately.
Compare attic fan installs
Ask for the fan, the roof or wall work, and the wiring as separate lines. Confirm the flashing on a roof-mounted unit.