I have a home that was built in 1986 in South Florida. It is a 2- story with only a single central unit. The upstairs has always been warmer than downstairs. I have always used the "auto" setting for the fan, but found that the house has the roller coaster effect when the unit cycles on and off. BTW, the unit IS correctly matched for the house, so it is not over or under rated for the SQ footage of the house.
I read somewhere that when there is a 2-story home w/out zoned A/C, it is preferable to run the fan 24/7 because it will keep circulating the air from upstairs thus keeping the whole house more consistent with temperature. Does this make sense?
The unit that I have is an Intertherm and it has a variable speed fan, so it is moving 1600 cu.ft. when the compressor is on, and when it is off, the fan slows to 1/2 speed.
Thanks in advance for any help or advice.
SD