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Question DetailsAsked on 8/8/2014

How much does it typically cost to replace 2 exhaust fans in the attic?

Our house was built in 2002 and after this last awful winter, discovered water/condensation in the attic. Now this summer the fans that typically run aren't working.

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2 Answers


If you have 2 fans, couple of things to check:

1) if breaker that feeds them is tripped, likely only one is defective so maybe no need to replace 2 - and could be just bad or wetted or rodent chewed wiring and the fan itself is OK.

2) if they are wired to run simultaneously, could be bad wiring or a shot thermostat or humidity switch and the fans are actually OK.

3) in either case, if breaker is tripped, I would not turn it back on - at least not without someone in the attic for 15 minutes or so (away from the fans) to make sure there is no sparkingor arcing when you turn it back on, but may have tripped out due to moisture in the wiring and no control or fan problem at all.

What I am saying is you quite likely do NOT have to replace the fans, or maybe only one, or maybe only the motor on one, not the whole unit, so when you call a Heating and AC contractor or Electrician to look at them do not say you want the fans replaced - say they are not working and want the problem located and solved.

Not knowing what type of house or roof you have, but I would recommend checking out the discussions in Home > Roofing in Browse Projects, at lower left, regarding attic ventilation - because fans should be a last resort measure, and generally do not do anywhere as good a job as eave and ridge vents, if they can be used with your roof >

The fact you had condensation in the attic this winter is likely an indication that the fans are not doing their job - or are on temperature control only and not humidity control also as they should be, so you might talk to the contractor about that at the same time - likely about $100-200 additional to put thermostat/humidistat control(s) on them if done during the repair visit.

Answered 5 years ago by LCD


I lost the trend of my thoughts there and forgot to give you ballpark $ - diagnosis and minor wiring issue should cost $100-200 range plus maybe $50 range if thermostat is bad, amount I previously said additional if you intend to put humidity control on it too. If fan(s) need replacement obviously depends on size and whether surface-mounted inside the wall or roof or if integral unit that has to be changed out on the roof - can run about $150-400 each range depending - cheapest if surface-mounted in gable or under roof, most if exterior mount and have to remove and relay some shingles and water shield to change the unit out. Second one if both happen to be dead might run $50-100 less if done at same time.

Remember when you talk to contractor, if fans need repair/replacement - most have removeable motors that can be replaced without removing the housing/hood, which saves a lot of labor.

Answered 5 years ago by LCD

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