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Reply by DrDirt

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Posted on HVAC questions to the Pro's

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DrDirt

4600 posts in 4345 days


#1 posted 11-14-2018 10:57 PM

You are definitely on track with the variable speed unit… For us it wasn’t about humidity, but circulation, where our unit will run the blower, w/o heating or cooling, to help keep the temperatures level in the house… especially downstairs would get cold w/o kicking on the heat, as the thermostat is upstairs in the bedroom hall.

Unit size – - look at how cold or Hot do you like it. those are as a difference between outside. If you and SWMBO, like to have the heat at 75 in the winter… stay with the larger unit. If you are frugal and keep to 68 or so, the smaller unit will work.

The Variable speed will prevent the need for cycling on and off with an oversize unit. But the old single speed, that was a big issue because the heat would kick on… Spike the temp, shut off, then equalize and get cold. Your High Efficiency new unit wont have that issue. We dealt with this on the AC side… and would err on having more capacity, then a small unit needing to run and run and run to keep up.

-- “The two most important days in your life are the day you are born and the day you find out why.” Mark Twain


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