Air Conditioning Oversizing Causes and Effects Part #2
When it comes to this topic, Doug Rye, a nationally known speaker says it this way, "DO NOT, DO NOT, and I repeat DO NOT let anyone install your air conditioning system without having the experience and expertise to size it correctly for your home. Too many homeowners allow the contractor to estimate or guess the size of the system. This nearly always results in an uncomfortable home. Make sure you ask how they sized it or did they just install the same size that was in their before. A reputable contractor will be happy to provide you with this information.
Here are the problems of not sizing the system correctly:
The ability of the air conditioner to remove moisture (latent capacity) is lowest at the beginning of the air conditioner cycle. The moisture removed from the indoor air is dependent upon the indoor coil temperature being below the dew-point temperature of the air. The moisture then wets the indoor coil and, should the unit run long enough, will begin to flow off the coil and be removed out of the condensate drain in your floor by the furnace.
Uncomfortable humidity levels. One of the consequences of short cycling is uncomfortable humidity levels, which compounds the problem by compelling homeowners to turn the thermostat even lower because they feel clammy. “In a house that’s properly engineered, you’ll feel cool even when the thermostat is set as high as 74 degrees, because the humidity levels are low. The house should not be above 50% humidity in the summer.
Mold, mildew, and warping. High humidity can encourage the growth of mold and mildew. You may notice mold growth in bathrooms and on interior walls or ceilings. Another sign of too much humidity is warping of wood floors and wood-framed windows.
Also, according to Doug Rye, buying an oversized air conditioner penalizes you in the following ways: a large air conditioner will not provide the best cooling and it costs more to buy a larger air conditioner than you need.
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