Common HVAC Problems & How to Fix Them

Troubleshooting Your HVAC System

Before calling for service, some issues have simple solutions you can try yourself. Here are the most common problems and their potential causes.

AC Not Cooling Properly

Possible Causes:

• Dirty air filter: Replace every 1-3 months - part of regular maintenance
• Thermostat settings: Check it's set to "cool" and fan to "auto"
• Frozen evaporator coil: Turn off AC, let thaw, check airflow
• Low refrigerant: Requires professional service
• Dirty condenser coils: Clean debris from outdoor unit

System Won't Turn On

• Check thermostat: Batteries dead? Settings correct?
• Circuit breaker: Check electrical panel for tripped breaker
• Safety switch: Condensate pan may be full (clogged drain)
• Outdoor disconnect: Ensure it's in the "on" position

Strange Noises

• Banging/Clanking: Loose or broken part - call for service
• Squealing: Belt issues or motor bearings - needs attention
• Buzzing: Electrical issue - turn off and call immediately
• Clicking: Normal at startup, persistent clicking needs diagnosis
• Rattling: Loose panels, screws, or debris in unit

Uneven Temperatures

• Blocked vents: Ensure all vents are open and unobstructed
• Duct leaks: Conditioned air escaping before reaching rooms
• Insulation issues: Some rooms may need better insulation
• System sizing: Undersized systems struggle with large homes - consider zoning

High Energy Bills

• Dirty filters: Force system to work harder
• Aging equipment: Efficiency decreases with age
• Duct leaks: Losing 20-30% of conditioned air
• Refrigerant leak: System runs longer to compensate
• Thermostat issues: Running more than needed

Water Leaks

• Clogged drain line: Most common cause - can often be cleared
• Frozen coil thawing: Check airflow and refrigerant
• Cracked drain pan: Needs replacement
• Improper installation: Unit not level, water not draining

When to Call a Professional

Some issues require expert attention:

• Refrigerant leaks or low refrigerant
• Electrical problems
• Compressor issues
• Gas furnace problems
• Persistent problems after basic troubleshooting