I apologize if this issue has been flogged to death somewhere else on this site but I could not find it. Closest I could come is the comparison between propane and geothermal.
My question - I need to replace an old air HP and am trying to decide whether the 10- 20k additional upfront cost for geothermal is going to make sense. From what I can tell it comes down to efficiency between the two types of systems. Electricity rates sky rocketed here in Maryland last year so either way I'm going to come out better with a new unit of either kind. However, if electricity rates continue to climb, the system with the better efficiency will keep the bill lower and heating and cooling should really be no different unless I add a desuperheater to offset hot water costs some. Problem is, I cannot find an apples to apples comparison of air HP v geothermal HP to see if the differences in efficiencies are large enough to justify paying that much more.
I also have not seen anything telling me how long a new air system would last relative to a geothermal system. People have posted numbers all over the map. Some firm figures would be greatly appreciated.