Getting quotes on switching to geo. All but one contractor sais 3 ton. Our home is a 2100 sq ft two story, with propane funace. All bids so far want to go with three 150 ft vert wells. I'm all about saving money, but want to make sure I get it done right the 1st time. The 4 ton contractor sais the main reason is an unfinished block basement. His bid for a water furnace two stage, desuperheater is about 5k more than a Carrier 3 ton 2 speed, desuperheater. The carrier guy swears we dont need 4 ton will have ac problems in summer. The 4 ton guy sais if we go 3 ton we wont even have enough heat for water heater. Getting frustrated, this shouldnt be rocket science. Home is 10 yrs old, decent.insulation and new topend replacement windows. Any thoughts?