p>Regarding the wait time for replacement parts for <strong>repairing a geothermal heat pump</strong> that’s an issue of comfort and inconvenience that we of course can’t council you on, but if you decided to wait, perhaps a few electric space heaters may get you through that time depending on how much you use your basement. </p> <p><strong>For geothermal system repair</strong>:</p> <p>You need to determine exactly what caused the failure, so first have a contractor pressure test the system to ensure it isn’t a leak down in the well. </p> <p>We called ClimateMaster to get their input, what we heard back from their tech support was that if water is leaking into the refrigerant that is a pretty significant and costly failure, if refrigerant is leaking into water than is less serious and can probably be remedied by replacing the coaxial coil. </p> <p>It’s of course frustrating to replace a system prematurely, but it’s still probably worth repairing the geothermal system rather than switching to gas, since digging the holes accounts for the biggest expense and it will offer savings long term.  But if you decide to switch, of the options you laid out I’d go with the gas boiler and keep your warm floors, that way the tubing in the floor will continue to provide even heat distribution without having to run ducts around your house, which you would probably need to do with a gas furnace. </p> <p>Radiant heat provides a lot of thermal comfort in a home, and given that you are already accustomed to having warm feet, I think the drop in floor temperature you would experience by switching to a forced-air heating system would be quite noticeable.</p