System Maintenance & Safety Checks

Carrier - Air Conditioning & Heating Equipment Preventative Maintenance

Expert Air can improve the efficiency of your existing system(s) as well as reduce repair frequencies with regular interval maintenance. Here are a few examples of problems that have been found by third party research and the benefits gained from correction:

A study by the Louisiana State University and Gulf States Utility found consumers could save about $30 per month just by making sure that their air conditioning system was cleaned and serviced regularly.

Home Energy Magazine found during an engineering study three main areas of concern:

  1. Duct Leakage
    • Average loss per home = 360 cfm
    • Average loss (as % of sq. footage) = 19.5%
  2. Refrigerant Charge
    • 62 % were overcharged
    • 23 % were undercharged
  3. Sizing of the Unit
    • 88 % were oversized
    • 2 % were undersized

The North Carolina Alternative Energy Corp (non-profit organization) examined air conditioning manufacturers' efficiencies versus the actual efficiencies that resulted after installation.

  • 90% of the units tested exhibited some sort of energy-wasting problem
  • 50% had an improper refrigerant charge
  • 40% failed to meet minimum air flow criterion. 20% were barely inside the range specified by manufacturers.

Texas A&M University found a 23% refrigerant undercharge could result in a 52% efficiency loss

Pacific Gas & Electric found the average heating energy savings for:

  • Repair of disconnected ducts was 15%
  • Repair of diffuser leakage 7.5%
  • Correcting low air flow 5.6%
  • Repairing leaks and correcting refrigerant charge 18.4%

Honeywell found that heat pumps lost almost 50% of their efficiency after 20 years, even if a typical "dust stop" filter was installed. In 20 years, a 12 SEER unit could degrade to a 6 SEER. This would double the energy cost!


Cooling Maintenance

  • Check refrigerant levels and pressures
  • Inspect electrical motors and connections, measure amp draw
  • Inspect fan blades and blower wheels for wear and damage.
  • Check electrical relays, contactors, circuit boards, and all related electrical connections
  • Clean condensate drain
  • Clean dirt, debris, and leaves from inside cabinet of outdoor unit.
  • Check compressor, compressor connections and amp draw
  • Inspect condenser and evaporator coils
  • Check air filters
  • Inspect ductwork for air leakage
  • Verify safety devices intact and operational
  • Measure temperature split
  • Check thermostat calibration

Heating Maintenance

  • Perform electronic leak search for gas leaks
  • Check compressor, compressor connections and amp draw (heat pump)
  • Inspect condenser and evaporator coils (heat pump)
  • Clean dirt, debris, and leaves from inside cabinet of outdoor unit (heat pump)
  • Check air filters
  • Inspect ductwork for air leaks
  • Check refrigerant levels and pressure (heat pump)
  • Inspect electrical motors and connections, measure amp draw
  • Check electrical relays, contactors, circuit boards, and all electrical connections
  • Inspect heat exchanger
  • Verify proper gas valve operation
  • Inspect flue exhaust vent
  • Check draft inducer and record amp draw
  • Verify safety devices are intact and operational
  • Measure temperature split
  • Check thermostat calibration
  • Check humidifier and humidifier pad
  • Check auxiliary heat strips and measure amp draw & staging (heat pump)
  • Check condensate pump operation

Note; Maintenance tasks vary based on equipment type. Package units (all-in-one) have a different task list than split systems. Heat pumps and dual fuel (hybrid) systems have a different task list than gas furnace systems.