Replacing your air filter regularly is probably one of the simplest things you can do to keep your heating and air conditioning system working its best. Keeping filters changed regularly will also help with indoor air quality and prevent contaminants and allergens build up in your home.
Most higher-end pleated filters have a three-month life (cheap ones don’t last as long). If constant air conditioning or heating is necessary where you live, you may need to replace your filter more often — even monthly. You may also need to replace your filter more often if you have allergies or asthma, and if you have pets.
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