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Troubleshooting Library

Common HVAC & AC Problems

Start with the symptom you are seeing. These guides cover safe homeowner checks, explain what different symptoms can indicate, and show when professional diagnosis is the better next step.

AC Not Cooling: Common Causes and What to Check

A practical guide to why an AC may run without cooling well, including thermostat settings, airflow, dirty coils, refrigerant-side issues, and equipment faults.

AC Blowing Warm Air: What It Can Mean

What to check when your air conditioner is blowing warm air, from thermostat settings and airflow to outdoor-unit and refrigerant-side problems.

AC Won't Turn On: Safe Checks Before You Call

What to check when an air conditioner will not start, including thermostat power, breakers, drain safety switches, and signs that need professional service.

AC Leaking Water: Drain and Condensate Problems

Common reasons an AC leaks water, including clogged condensate drains, frozen coils, drain-pan problems, and improper drainage.

Frozen AC Unit: Why Ice Forms and What to Do

Why air conditioners freeze, including airflow restrictions and refrigerant-side problems, plus what to do before restarting the system.

AC Running Constantly: Causes of Long Run Times

Why an AC may run nearly nonstop, including extreme load, airflow restrictions, thermostat issues, duct losses, dirty coils, and equipment problems.

AC Short Cycling: Why It Starts and Stops Too Often

Common causes of AC short cycling, including thermostat, airflow, electrical, frozen-coil, and system-sizing problems.

Weak Airflow From Vents: What to Check

How filters, vents, returns, ductwork, blower problems, and frozen coils can contribute to weak HVAC airflow.

AC Making Strange Noises: Buzzing, Rattling, Grinding and More

A guide to common AC noises and when buzzing, rattling, grinding, squealing, or clicking can indicate a service problem.

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