Originally Posted by
beenthere
That depends on how the unit is sized.
Im my own house. My unit is single staged. And if I try to drop 1 degree. It takes over an hour on average temp days, and can take 2 or more hours on hotter days.
Mine is set up to remove a lot of moisture.
Yours is 2 stage, and is trying to drop temp running in low stage. So it will take hours.
I strongly doubt, that your contractor installed a duct system sized for 4 tons, when he was installing a 3 ton unit.
That tech was probably using a rule of thumb. Which is what got you into this situation to begin with.
There is also a good chance your stat isn't set up right.
I would set it up to go to second stage quicker, and finnish the cooling cycle on second stage, when its hotter outside.
Depending what stat they used, you may need another stat to do that.