HVAC
HVAC Record guides
Plain-language answers to HVAC questions, written from the same sourced data behind HVAC Record. Every guide lists its sources and the date it was last updated.
Updated June 13, 2026
Why is my AC running but not cooling?
AC running but not cooling? Check the thermostat, a clogged filter, a tripped breaker, a blocked outdoor unit, and frozen coils — and know when to call.
Updated June 13, 2026
What are the signs your AC needs repair?
Seven signs your air conditioner needs repair — warm or weak airflow, short cycling, odd noises, bad smells, rising bills, water leaks, and ice.
Updated June 13, 2026
Should you repair or replace your air conditioner?
Repair vs replace your AC: the $5,000 rule, the 10–15 year age line, SEER2 efficiency savings, and how the 2025 R-410A phaseout shifts the math.
Updated June 13, 2026
How do you choose a trustworthy HVAC contractor?
Vetting an HVAC contractor: EPA 608 certification, state license and insurance, Manual J sizing for replacements, written quotes, and review proof.
Updated June 13, 2026
How much does AC repair cost in 2026?
What AC repair costs in 2026: a typical $150–$650 service call, part prices from capacitors to compressors, and how to avoid overpaying.