A yearly professional checkup is a good general maintenance schedule, with cooling systems commonly checked in spring and heating systems in fall. Always follow the equipment manufacturer's recommendations.
Yes. A dirty filter can restrict airflow and make the HVAC system work harder. ENERGY STAR recommends checking filters monthly during heavy-use periods and replacing them as needed.
A furnace may blow cold air because of a dirty filter, thermostat issue, airflow restriction, ignition problem, or other mechanical malfunction.
Unusual noises, inconsistent temperatures, restricted airflow, increasing energy use, frequent cycling, or repeated breakdowns can indicate that professional inspection is needed. ENERGY STAR notes that declining performance and frequent repairs can also be signs that an older system may need replacement.
Frequent cycling can be caused by a dirty filter, thermostat problem, airflow restriction, overheating, or an improperly sized HVAC system.
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