How often should I service my HVAC system?
Once a year for an AC or furnace, and twice a year (spring and fall) for a heat pump.
What size air conditioner do I need?
It depends on your home's heat gain, not just square footage. Ask for a Manual J load calculation.
What SEER2 rating should I buy?
The federal minimum is 13.4 SEER2 in the North and 14.3 in the South. 15–17 SEER2 is a good value sweet spot in hot climates.
How long do HVAC systems last?
Typically 12–17 years for AC and heat pumps, and 15–25 years for gas furnaces.
Why is my AC running but not cooling?
Common causes include a dirty filter, a frozen coil, a failed capacitor, a dirty condenser and low refrigerant from a leak. See our troubleshooting guide.
Can I still get R-22 refrigerant?
R-22 production ended in 2020. Only recovered or stockpiled supply remains, so recharges are expensive.
What is R-454B?
A lower-global-warming-potential A2L refrigerant used in many new AC and heat pump systems made from 2025.
How often should I change my air filter?
Every 1–3 months for standard 1-inch filters, more often with pets or allergies. Thicker media filters last 6–12 months.
What temperature should I set my thermostat to?
The US Department of Energy suggests 78°F when home in summer and 68°F in winter, with setbacks when you're away or asleep.
Is a heat pump good in cold climates?
Modern cold-climate heat pumps work well below freezing. Very cold areas often add backup heat.
Should I repair or replace my AC?
Try the "5,000 rule": age times repair cost. Over $5,000 suggests considering replacement.
Do you provide HVAC service?
No. AC Heating Service is an independent information site. We help you understand problems and choose a licensed local contractor.
