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Exhaust fans
If your bathroom and kitchen exhaust fans have not been changed for 15 years or more, they are most likely in need of replacement. Fans get clogged over time with the detritus from the air they are taking out of the room. They lose efficiency and finally stop altogether. Next time you have an electrician come in, consider asking for exhaust fan replacements at the same time. You will notice a difference. The fans will work better and do the job in a shorter time.