HVAC FAQ: Answers to Google's Most-Asked Questions

How Often Should HVAC Be Serviced?

Schedule professional maintenance twice yearly — cooling tune-up in spring, heating check in fall. Change filters every 1–3 months during heavy use. Maintenance extends equipment life, keeps warranties valid, and catches small issues before peak season breakdowns.

How Much Does AC Repair Cost?

Minor repairs (capacitors, contactors, condensate switches) often run $150–$400. Refrigerant leak repairs and coil work cost more. Always request a diagnostic fee policy upfront — many companies credit the fee toward repair if you proceed.

How Long Do AC Units Last?

Central AC condensers average 12–17 years in the Sun Belt due to heavy runtime. Furnaces last 15–20 years. Heat pumps share similar lifespans. Salt air and poor maintenance shorten equipment life.

Does AC Refrigerant Need to Be Refilled Every Year?

No. Annual top-offs indicate a leak. EPA-certified technicians must repair leaks before recharging. See our full guide on refrigerant signs for details.

What Temperature Should I Set My Thermostat?

Energy Star suggests 78°F when home in summer. Raise it when away. Each degree lower can increase cooling costs roughly 3%. Program gradual setbacks to avoid long recovery cycles.

When Is HVAC an Emergency?

No heat below 40°F outside, no cooling above 95°F with vulnerable occupants, gas smells, carbon monoxide alarms, or sparking electrical components are emergencies. Turn systems off and call 24/7 service.

What HVAC Work Can Homeowners DIY?

Safe DIY: filter changes, thermostat batteries, clearing outdoor debris, resetting breakers once. Not DIY: refrigerant, gas valves, electrical rewiring, duct sealing in attics with asbestos risk.

USA HVAC Repairs answers questions 24/7 at (380) 227-0861 with licensed, insured technicians nationwide.