Most homeowners and businesses benefit from scheduled maintenance before periods of heavy heating or cooling use. The appropriate interval depends on equipment type, operating hours, environment and manufacturer guidance.
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Clear filtersENERGY STAR recommends checking the filter monthly, especially during heavy heating and cooling use, and changing it when dirty; its general guidance says at least every three months. The correct interval may be shorter with pets, construction dust, smoke, high system use or a filter that has less surface area. Use a filter type and resistance appropriate for the equipment. A very restrictive filter can reduce airflow even when it appears clean.
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