Preventative Maintenance Studies & Statistics

Pacific Gas and Electric found the average heating energy savings can be found when repairing the following items:

  • Repair of disconnected duct could save 15%
  • Repair of leaky diffuser could save 7.5%
  • Correct low airflow could save 5.6%
  • Repair leaks and correct refrigerant charge could save 18.4%

Other recent studies have found the following problems with most heating and air conditioning equipment:

North Carolina Alternative Energy Corporation found that 90% of units tested exhibited some sort of energy wasting problem, 50% of those systems had improper refrigerant charge, 40% failed to meet minimum airflow requirements (only 20% were inside the range set by the manufacturer).
Further studies showed that a 20% deficiency in air flow can decrease SEER rating by 17%, and that a 15% return air leak can cut efficiency in half!
Texas A & M University found that systems that are undercharged by as little as 23% could result in a 52% efficiency loss.
Lakeland Electric and Water researchers found that repairing leaky duct could reducecooling energy by 17.4%.
Honeywell found that most units lose 50% of their efficiency after 20 years
Louisiana State University and Gulf States Utility found that customers could save an average of $30.00 per month just by making sure their furnace and air conditioner was serviced and cleaned regularly.

Cost Savings Information

  • Some HVAC problems can DOUBLE your operating costs without reducing your comfort level.
  • Up to 80% of all HVAC compressor failures could be eliminated if the problems that led to the failure were found and eliminated in a timely manner.
  • A “Freon” (refrigerant) undercharge of only 10% can increase your operating costs by up to 20% or more.
  • Freon should never need to be replaced. It has no known shelf life. If it must be added every year, there is an expensive leak which should be found and repaired.
  • A dirty evaporator, condenser and blower wheel could increase electrical usage by 50% or more.
  • Just a 100th of an inch of dirt or film on an evaporator coil can reduce efficiency by as much as 15%.
  • Undetected and un-repaired small problems often lead to expensive major repairs.
  • PMP inspections can find and repair dangerous problems.
  • According to studies conducted by Pacific Gas and Electric Utility Company, you can save up to $50 a month on your utility bill by making sure your HVAC system is cleaned and serviced regularly.

PG&E's Online Resources

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