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When maintained and repaired when necessary, your whole-house fan can last between 10 and 20 years. Check your warranty when purchasing the unit, as it will typically only cover between 5 and 15 years. Its longevity will also depend on your local climate and how much you use the fan. Having a professional size your fan appropriately for your home size will also help ensure it doesn’t get overworked, which can limit its lifespan.

Leaving an exhaust fan on constantly isn’t ideal. While it helps remove moisture and odors, continuous use will lead to wear and tear, higher energy costs, and even fire risks if the motor overheats. Bathroom fans should run for 20 to 30 minutes after a shower, while kitchen exhaust fans should be used only when cooking or clearing air.

It is unlikely that a ceiling fan will fall, even if it develops a wobble. During a proper installation, ceiling fans are securely bolted to a ceiling joist, and the fasteners used for mounting are generally separate from the components related to balancing. A wobble is typically caused by an imbalance, which can be annoying and may lead to other issues, but is not usually dangerous on its own.

However, if a fan is wobbling because it was not installed correctly, it could be at risk of falling. For safety, it's always a good idea to ensure all mounting screws are tight and to address any wobbling or imbalance issues promptly.

If your ceiling fan is humming, that's usually a sign of an electrical issue. A low-pitched grinding sound could be caused by the motor or a lack of lubrication in the bearings, but a true humming sound will be caused by a failing capacitor or faulty wiring. Unless you have experience with electrical issues, you should call a pro for any ceiling humming noises.