Here in Central PA, the average well is 150-165' per ton. Carrier and Climatemaster are the same. We always use 2 speed units with ECM motors, and desuperheaters. This generally equates to the purchase of high end air-to-air equipment, but with 2 or more times the eff. The homeowner gets his 30% which just about covers drilling. We're now doing more direct refrigerant systems than propylene, using a new approach that addresses oil return issues.. and the wells aren't as deep.
PA school systems have been doing more and more geo over the last 15 yrs. They started out using boiler-tower setups, but now design puts wells under football fields. There are individual h/p(s) installed with 2-way valves in each room with VFDs in the mechanical rooms.
Geo doesn't get you off the grid..but with deregulation coming in PA, facilities and homeowners are looking at rates to rise 35% +. This is being done here without any support from state government.
Look to your distributor for educational opportunities.