This house was built in the 40s but is very sturdy; with two floors of 1500sf each and another 1500sf of basement. It has two separate Forced air AC of 3 tonnes and 3.5 tonnes (total of 6.5 tonnes) and an old oil boiler powered baseboard. I am very interested in upgrading to a geothermal system. I need help with the two main the proposals that I am considering. Proposal#1: Two separate geothermal systems of Climatemaster 26.1 EER 3 tonnes 2 stage Heat Pump with variable speed air handler and 10kw heat with no bells and whistles for the total amount of $46,560. Proposal#2: One geothermal system of WaterFurnace 5 series 5.25 tonnes with Hot Water Assist option & Variable Speed blower(ECM), Intellistart (soft starter), "Ultrascroll" Dual Capacity compressor, and Aurora Performance and Refrigeration Package with two zones for the total amount of $32,650. I confess I have no clue as to how to proceed further. After reading more than few posts here, I am confused as to what should be my main concern and how I can/should proceed.