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Most people describe the sound of an unbalanced ceiling fan as a buzzing or grinding noise. This is caused by the parts of the fan rubbing or rattling against each other as the blades spin. However, a wobbling fan can also make squeaking, rattling, or thumping sounds, depending on the severity of the balance issue.

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.

Exhaust fans push air out of spaces, removing moisture, heat, odors, and pollutants. They vent air outside through ducts, preventing mold and improving air quality. Unlike ventilation fans, which circulate fresh air in and out, exhaust fans focus solely on expelling unwanted indoor air.

Some disadvantages of a blower cooler—a type of cooling device sometimes known as a swamp cooler—are its increased energy demand and its higher noise level. Blowers require more energy to run because they push air out at a higher pressure. This also means a blower cooler can be louder than a fan. Blower coolers are also not recommended for humid areas because humidity limits their cooling potential.