HVAC tune-up checklist

Record both the refrigerant pressure readings and whether levels are adequate. Low refrigerant often indicates leaks, while high pressure can signal airflow restrictions or overcharging. Note the specific refrigerant type and compare readings to manufacturer specifications for the particular unit you’re servicing.

Focus on verifying tight electrical connections at all terminals, checking contactor condition for pitting or wear, inspecting capacitors for bulging or leaking, and measuring amp draw on motors to ensure they’re operating within manufacturer specifications. Also examine wiring for signs of overheating or insulation damage that could indicate potential problems.

Measure static pressure across the system using a manometer and compare to manufacturer specifications. Check supply and return vents for proper air delivery, ensure no obstructions block airflow, and verify filter condition isn’t restricting air movement. Uneven airflow often indicates duct issues or blower problems that need further investigation.

Replace disposable filters showing visible dirt accumulation, damage to the filter material, or when they’ve been in service for the manufacturer’s recommended time period. Washable filters should be replaced when the frame is damaged or the filter material shows signs of deterioration that cleaning can’t resolve.