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I'd go with the Tranquility 27 by Climatemaster have not seen any problems with them have seen some ploblems with the waterfurnace unites

yepper in DFW 4 tons would be 4 wells 300 feet of 1"

Well here in Texas wells have to be mim of 20'
and can not be less than 50' from water well

Well I would call a tech like myself that works on geo system but you can look at inlet and outlet water temps to see what going on