Thermal Zone Maintenance
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Regular HVAC preventative maintenance is the best way to ensure peak performance & trouble-free operation. Pre-season maintenance is also important. It can help to avoid a system failure in severe hot or cold weather when you need it most, and it can also keep your energy bill from getting out of control.
When should I do furnace maintenance?
Below you’ll find our Preventative Maintenance guide, which is our proven method to check your system and your home in constant comfort.
- For a system that heats and cools: perform maintenance in the spring and fall
- For cooling system maintenance only: perform maintenance at least once a year, before the cooling season
- For furnace maintenance only: perform maintenance at least once a year, before the heating season.
Outdoor Units Checklist
- Inspect unit for proper refrigerant level and adjust if necessary
- Clean dirt, leaves and debris from inside cabinet
- Inspect base pan for restricted drain openings—remove obstructions as necessary
- Inspect coil and cabinet—clean as needed
- Inspect fan motor and fan blades for wear and damage—on older models lubricate as needed
- Inspect control box, associated controls/accessories, wiring and connections. Controls may include contactors, relays, circuit boards, capacitors, sump heat and other accessories. All control box and electrical parts should be checked for wear or damage.
- Inspect compressor and associated tubing for damage
Indoor Units Checklist
- Inspect and clean blower assembly (includes blower housing, blower wheel and motor)
- On older models, lubricate motor and inspect and replace fan belt if needed
- Check combustion blower housing for lint and debris and clean as necessary
- Inspect evaporator coil, drain pan and condensate drain lines. Clean as needed
- Inspect for gas leaks in gas furnaces
- Inspect burner assembly—clean and adjust as needed
- Inspect ignition system and safety controls—clean and adjust as needed
- Inspect heat exchanger or heating elements
- Inspect flue system—check for proper attachment to the furnace, any dislocated sections, and for signs of corrosion. Replace if necessary.
- Inspect control box, associated controls, wiring and connections
- Clean or replace air filters
- Inspect conditioned airflow system (ductwork)—check for leaks
- WHILE YOUR SYSTEM IS OPERATING
- Monitor system starting characteristics and capabilities
- Listen for abnormal noise
- Search for source of unusual odors
- Monitor air conditioning and heat pump systems for correct refrigerant charge
- Measure outdoor dry bulb temperature
- Measure indoor dry and wet bulb temperature
- Measure high and low side system pressures
- Monitor gas furnace for correct line and manifold gas pressure—make adjustments as needed
- Measure temperature rise and adjust airflow as needed
- Check vent system for proper operation
- Monitor system for correct line and load volts/amps
- Monitor system operation per manufacturer’s specifications
- Provide system operation report and recommend repairs or replacement as necessary
- NOTE: Thermal Zone recommends all maintenance and service work be performed by a professional air conditioning and heating dealer that holds the appropriate credentials to install and service air conditioning and heating equipment.
Contact Us
Contact your local independent Thermal Zone Heating & Air Conditioning Dealer. You can find the closest dealer to you by completing our find a Thermal Zone dealer form.
