Geothermal furnace ratings/comparisons
I'm getting bids for a ground source heat pump. It will be 3 tons, vertical closed loops, for an 1800 sq. ft. house in the Kansas City area. The bidders propose different furnaces (Ruud, WaterFurnace). One vendor includes 10 years' maintenance as part of the bid, but they're about $4000 more than another vendor.
I haven't been able to find any info on furnace efficiency and reliability so I can make my decision knowledgeably. Can anyone help me out?
Thanks in advance.