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premature failure.
“To the untrained eye, two indoor coils may look alike, just as two keys may look alike,” says Marris. “But one key will leave you in a hot spot if it doesn’t properly match thelock. The same holds true for air conditioning and heat pump systems. If you don’ replace your indoor unit, you won’t be getting what you paid for.”
Bryant’s studies show that when a typical condensing unit of today —with a Seasonal Energy Efficiency Ratio (SEER) of 10.0, the minimum according to Department of Energy standards — is combined with a typical 1970s indoor coil, there is a five percent drop-off in capacity, an 11 percent loss in efficiency and a 20 percent increase in compression ratio, w'hich could lead to premature compressor failure. The study compared two clean, identical units, one with a matched indoor evaporator coil, the other with an older indoor coil. The older coil was devoid of the dirt and grime that would be found on a typical 15 year-old coil, culprits that are sure to lessen capacity and efficiency even more, while further taxing the outdoor unit.
Changing the indoor coil in
87.3%