General Maintenance Tips

You wouldn't drive your car 100,000 miles without changing the oil. The same logic holds true for your home comfort system. Regular preventative maintenance is the best way to ensure trouble-free operation and peak performance. 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.


The old adage is true: an ounce of prevention is worth a pound of cure. Below you'll find our Preventative Maintenance Checklist, which is our proven method to keep your system in the pink and your home in constant comfort.

For a system that heats and cools: perform maintenance in the spring and fall.

For cooling only: perform maintenance at least once a year, before the cooling season.

For heating only: perform maintenance at least once a year, before the heating season.


Many dealers provide priority service for their customers who have an annual maintenance or service agreement. Bi-annual preventative maintenance will ensure that your system runs as efficiently as possible. Your local dealer will perform the following tasks, depending on the unit:


Inspected the following:

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 contractors, 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


Inspected the following:

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


Inspected the following:

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: Piedmont Mechanical 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.


Air Conditioning systems are designed to provide optimal efficiency and comfort. Now it's time to do the same to your home. Here are some things you can do around the house to optimize the operation of your system, as well as the comfort inside your home.


Inspected the following:

Set the thermostat as high as comfort will permit.

Make sure attics are adequately ventilated to relieve heat buildup. If necessary, improve airflow by adding or enlarging vents.

When building a new house or renovating an old one, choose light-colored roof shingles to reflect more of the sun's heat.

During moderate weather, don't use the air conditioner unnecessarily.

Draw blinds or drapes to block the sunlight during the hottest part of the day.

Install awnings over windows exposed to direct sunlight.

In the cooling season, don't run kitchen and bath exhaust fans longer than necessary.

Don't place lamps, TV sets or other heat-producing devices beneath a wall-mounted thermostat. Rising heat from that equipment may cause the air conditioning system to overcool your house.


Inspected the following:

Locate the thermostat on an inside wall away from windows and doors.

Set the thermostat as low as comfort permits. Each degree over 68°F can add 3% to the amount of energy needed for heating.

People generate heat. So lower the thermostat a degree or two when expecting a large group of guests.


Inspected the following:

Make sure your home is properly insulated. This is the single most important step in conserving energy. Thermal insulation should be specified in terms of thermal resistance (R-values). R-30 (10") is recommended for ceilings, and R-11 (3-1/2") for exterior walls and floors over unheated areas. In colder climates, consider additional insulation.

Infiltration of humid outside air is your heating and air conditioning system's worst enemy—it could account for 15% to 30% of air conditioning energy requirements. Find the places where air can sneak into the home and plug them with caulking, weather-stripping or plastic. Also, weather-strip and caulk around all entrance doors and windows.

Cut heat transfer through your windows by 40% to 50% with double-glazing (two panes of glass separated by a sealed air space) and low-e glass.

Use wood- or metal-frame storm windows even if single-glazed windows are high quality. The extra layer of glass and the layer of still air will cut heat transfer considerably.

Install storm doors at all entrances to your house.

Keep all windows and doors closed.

Remember that by increasing the glass area, you increase the amount of heat added in summer and lost in winter.

Make sure fireplaces have tight-fitting dampers, which can be closed when the fireplace is not in use. Invest in a humidifier to conserve energy in winter. The air in your home won't be as dry, so you stay comfortable at a lower temperature setting.


     General Maintenance & Quick Fixes

     Air Conditioning Tips & Quick Fixes

     Heating Tips & Quick Fixes

     Purchase Maintenance Agreement