Attic Fan Installation and Repair
An attic fan that has quit is easy to miss until the upstairs will not cool down in July. Most of the time it is not the whole fan that has failed. It is the motor, the thermostat that tells it when to run, or the wiring feeding it through a hot attic.
Why attic fans stop running
A powered attic fan is a motor, a thermostat and a circuit. The thermostat switches the fan on when the attic gets hot and off when it cools, and it is the part that fails most quietly: the fan looks fine, it simply never gets the signal to start. Motors wear out too, usually announcing it first with a hum, a rattle or a fan that has to be nudged to spin.
The other half is the wiring. An attic is the harshest place in the house for a connection, hot every summer and cold every winter, and fans that were wired off the nearest light circuit with a loose splice are common. We find which part has actually failed before replacing anything, and we check that the fan has enough intake venting to pull from. A fan without enough intake pulls cooled air up out of the house instead.
What moves the price of attic fan work
We do not publish a dollar figure we cannot stand behind. What we can tell you is which parts of the job move the number.
| Job | Relative cost | What drives it |
|---|---|---|
| Replacing a failed thermostat or humidistat | Baseline | The control that turns the fan on. A common fix when the fan itself still spins freely. |
| Replacing the motor | Moderate | When the motor has seized or burned out and the housing is still sound. |
| Replacing the whole fan | Higher | Like-for-like in the same opening, gable or roof. The wiring is checked and brought up to date while we are there. |
| A dedicated circuit | Depends on distance | When the fan was tapped off a lighting circuit or has no proper disconnect. Distance to the panel decides it. |
| Adding a fan where there is none | Project | Depends on the attic, the opening and the venting. We look before we quote. |
We diagnose first, tell you whether it is the motor, the control or the wiring, and give a flat price before any work.
What to Expect
Find what actually failed
Motor, thermostat, or the power feeding it. Testing takes minutes and saves replacing the wrong part.
Check the venting
A fan needs intake to pull from. Too little and it pulls cooled air out of the house.
Flat price, then fix
Repair when repair makes sense, replace when it does not.
Test it running
Thermostat set, fan cycling, and the circuit left labelled at the panel.
Questions We Get
Why did my attic fan stop working?
Most often the thermostat has failed and never tells the fan to start, or the motor has worn out. Less often it is the circuit: a tripped breaker, a failed connection in the attic, or a fan that was wired off another circuit. We test each before replacing anything.
Is it worth repairing an attic fan or should I replace it?
If the housing and blade are sound, replacing a thermostat or a motor is usually cheaper than a new fan. If the fan is old, noisy and rusted, a like-for-like replacement is often the better value. We will tell you which after looking at it.
How do I know if my attic fan thermostat is bad?
If the attic is clearly hot and the fan is not running, but it runs when the thermostat is turned down or bypassed for a test, the thermostat is the likely fault. That test is best left to an electrician, since it means working on a live circuit in the attic.
Does an attic fan need its own circuit?
It depends on the fan and on what else is on the circuit. Many are wired off a nearby circuit, and some of those are overloaded or have no local disconnect. We check how yours is fed and recommend a dedicated circuit only when it is actually needed.
Can an attic fan make my house hotter?
It can make your air conditioning work harder if there is not enough intake venting. The fan then pulls conditioned air up through gaps in the ceiling instead of drawing outside air through the vents. Checking the intake is part of every attic fan job we do.
Do you work on solar attic fans?
Solar attic fans run on their own panel rather than house wiring. We can tell you whether a failed one is the panel or the motor, but the wiring side of attic fans is where we add the most.
Ready to Get Started?
Call, text, or request a free quote online — we typically respond within one business day.