All - I'm new here, but looking for some help. We are building new construction. Up until this weekend, we thought we had natural gas. Surprise: we don't (our neighbor does, and that's where it stops -- $20K to extend 215 feet). The builder and his HVAC sub were planning to put in a propane system. I don't have any of our load numbers yet, but house is 2-story, 2510 finished sq ft with about 130o sqft unfinished basement. At this point, just trying to understand what the ballpark would be. With the propane system, we will already have the rigid duct in place (so, no cost increase there?). We would be replacing the gas furnace and the AC unit with the geo heat pump - so some extra cost there for the geo unit? Quote on the wells for a 4-ton system was "rough" estimate of $9600 ($15/ft). Seems reasonable. So, what I can't figure out, is why the rough estimates for geo are $25-$35k ABOVE the full cost of the propane system, when it seems to me it should only be the cost differential in the heat pump, plus the wells (maybe $15k extra)? What am I missing? Also, any contractors in SE PA that would like to bid on this, please let me know!