First, follow manufacturer’s routine maintenance directions. Second, have entire system checked twice a year by a qualified service person. An annual service check should include such inspections/items as:

Condenser Units (Outside Unit):

• Lubricate condenser fan bearings (if not permanently sealed)
• Clean air intake side of condenser coil
• Tighten electrical connections
• Check operating current with volt amp meter
• Check supply voltage with volt amp meter
• Check refrigerant levels and pressures
• Inspect compressor start and run capacitors

Furnace / Air Handler:

• Clean or replace filter
• Lubricate unsealed blower fan motor and blower bearings
• Check and adjust fan belt tension/condition
• Clean blower wheel
• Inspect/adjust burner
• Clean evaporator coil and check fin condition
• Clean and inspect drain lines and pan
• Check for excessive attic air leakage into return chamber

Filters:

• Permanent-Clean with mild detergent, per manufacturer’s recommendations, every 30 to 60 days
• Replaceable-Replace every 30 to 60 days

Duct Work

• Check for air leaks, particularly at furnace/air handler. Seal leaks with duct tape
• Ductwork should be insulated with at least 1-1/2″ of batt insulation with a foil or vinyl vapor barrier on the outside

Windows & Doors:

• Keep closed when system is running
• Caulk and weather-strip to close air gaps
• Open drapes and shades over windows facing sun

Activities:

• Wash/dry clothes during warmest times of day (late morning and afternoon)
• Use exhaust fan when cooking only when needed
• Keep thermostat at desired setting

Others:

• Check thermostat for proper operation and calibration
• Measure air temperature at supply and return vents