Posted by Bob M on July 05, 2012 at 09:19:47 from (69.207.87.163):
In Reply to: Another AC Question posted by 8N'r--WI on July 05, 2012 at 04:57:45:
Tim - The difference in energy efficiency between continuous running and constant cyling is miniscule. It's not likely to be noticed in your electric bill.
Constant cycling (especially short-cycling) IS harder on the compressor however - startup is what puts the most stress the compressor, contactor, etc.
Running the furnace blower continuously very slightly reduces efficiency. There is energy required to run the fan plus the latent heat added to the air as the small amount of condensation left on cooling coil evaporates at the end of each cooling cycle. However I've found the house feels more comfortable (and wife/kids less likely to fiddle with the cooling setting....) if I let the blower run continuously.
FWIW my home A/C cycles every 15 - 20 minutes at 90 deg and high humidity.
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