The checklist for an HVAC tune-up is extensive. Here are a few of the most significant things to check:

• Verifying and adjusting the blower motor and belts
• Testing and setting analysis for the thermostat
• Change the air filter
• All moving parts should be lubricated.
• Straighten and inspect fins
• Tightening the electrical connection
• Condensate drain cleaning
• Measuring the charge and levels in a refrigerator
• Check the controls
• Coil maintenance

A heating maintenance check includes an inspection and testing of your furnace or boiler right before or during the heating season. Your HVAC technician will inspect your furnace filter during this visit, and replace it if necessary. He will look for signs of wear on the exterior and ventilation system of your heater and make any required repairs. The interior parts of your furnace will then be thoroughly cleaned and checked for wear or damage. This includes the blower, motors, pressure switches, and ignition assembly. Your furnace's electrical components and power consumption will be measured to look for any irrational power use. Additionally, the thermostat in your house will be examined, cleaned, and calibrated.

Before or during the cooling season, your home's air conditioner will be thoroughly inspected to make sure it is in excellent working order. Your technician will examine all internal parts, motors, and belts in your air conditioner, as well as its exterior and interior components. The amount of coolant in the air conditioner will be measured, and any lost coolant will be replaced as necessary. Your technician will also check all caps and valves in addition to the circuits, safety controls, drain line, and condensate pump. To avoid sparking or failure, electrical components will be examined for signs of wear or damage and replaced as necessary. For best performance, he will ensure that your outdoor unit is level. To keep dust and debris out of your home, he will if necessary also change the HVAC filter.