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Fan power is measured by CFM, or cubic feet per minute. For every 1,000 feet of square footage in your attic, you need a minimum of 700 CFM. Steeper roofs may need larger fans or about 840 CFM.  You can figure the size of attic fan you need by multiplying the square footage of your attic floor by 0.7. (multiply by 1.2 for a steep roof and 1.15 for a dark roof). That number is the CFM required for your fan to run efficiently.

The lifespan of an attic fan depends on the type. Passive fans can last 40 to 50 years, while electric and solar models typically last 10 to 15 years. You can extend the life of your fan with regular maintenance, such as cleaning the fan blades and shutters and checking for moisture. For professional service, you can consult a local attic fan installer or have an HVAC technician clean, oil, and inspect the unit for potential issues.

If you think your fan needs to be oiled, the first thing that you have to do is cut the power to the fan. The best and safest way to do this is by flipping the circuit breaker that leads to that room.  Depending on the model of your fan, you may need to remove a cover. Look for a hole labeled oil. If there isn't one, check the manual or look for schematics online. Once located, use the recommended lubricant or spray. 

A whole-house fan will not allow you to control your home's temperature and keep it at a specific temperature like a traditional AC unit would. You rely on the night and morning weather to cool your home down efficiently. Also, whole-house fans can be loud and may allow cold air to enter your home in the winter. They also require penetrations through your exterior walls or roof, which could invite water and pests in if they aren’t installed properly.