That's exacly what researchers found when they examined the air conditioners of homeowners complaining about high summer electric bills.

Here's what independent researchers commissioned by Pacific Electric and Gas found:

• 67% had improper air flow.
• 53% had dirty or clogged coils.
• 40% had dirty,clogged or missing filters
• 27% had refrigerant that was overcharged.
• 27% had refrigerant that was undercharged.
• 20% had a refrigerant leak.
• 93% had dut leakage greater than the recommended maximum.

​They concluded that these homeowners could achieve from between 10% and 30% reductions in energy bills without major repairs.

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