Frequently Asked Questions
How often should I change my HVAC air filter?
In most homes a 1"-thick disposable filter should be checked every 30 days and replaced at least every 60-90 days. The U.S. Department of Energy notes that dusty environments, constant system use, or pets can shorten that interval to monthly or even every 3 weeks. Leaving a filter in too long restricts airflow, drives up energy costs, and can damage the blower motor.
How often does my heating & cooling equipment need professional service?
Industry best practice is twice-a-year preventive maintenance. Once in spring before the cooling season and again in fall before heating season. Techs clean coils, test refrigerant levels, tighten electrical connections, and verify safety controls. Skipping tune-ups can trim short-term costs but leads to higher bills, surprise breakdowns, and voided manufacturer warranties.
How long should an HVAC system last?
With proper upkeep a central air-conditioner or heat pump typically lasts 15-20 years, while gas furnaces average 15-25 years. Efficiency drops 5-10 % after year 10, and repair frequency rises sharply after year 15. ENERGY STAR recommends considering replacement if your AC/heat pump is 10+ years old or the furnace is 15+ years and needs expensive repairs, because today’s high-efficiency units can cut energy use by 20-40%.
What size HVAC system does my house need?
“Size” is measured in BTUs (for heating) or tons/BTUs (for cooling). A contractor should run an ACCA Manual J load calculation, which factors in square footage, insulation levels, windows, occupancy, and local climate. Rule-of-thumb sizing (e.g., “1 ton per 500 sq ft”) often overshoots, causing short-cycling, humidity issues, and higher bills. Reputable pros supply the Manual J report or use reputable calculators that follow the same method.