Very diverse comments about Geo. I will say that it all starts with the installation. Those that have it and hate it probably didn’t get a great installation or perhaps a great product line. Those that love it probably had the job done right.
Let me preface this by saying I used to burn wood and I also had a fuel oil furnace. I strongly disliked both options.
Before installing our Geo in 2013 (Water Furnace) we did a complete house makeover. We had blown in insulation put in all the walls, R-60 in the attic, and closed cell foam 2” thick in the crawl space along with all new doors and windows.
We have a 3000 sq ft house and I heat in the coldest Ohio months for about $130 a month. That cost is slightly elevated because I also run a mini-split in the winter months for a 400 sq ft 4 seasons room with a concrete floor. The cooling portion is almost a none issue about $15-$20 a month to have the house like an ice box. I also have a 2nd water heater that the Geo uses to keep water temps around 90 degrees and that fills my other water heater saving me a little bit of money.
We had the heating ducts replaced, 4 vertical wells drilled and the GeoThermal installed for just shy of $27k minus the 30% tax rebate. I was getting a new system anyway so once that was subtracted from the cost it didn’t take me long to get back into the green from what we were spending. I figured about 2 years it took us to break even.
I do realize that we could have went with a normal system and made the house more energy efficient and still had some great savings but no natural gas where we live and propane or fuel oil are just not as appealing.
I had one small issue in 5 years and it was a power issue during a storm where the Geo locked itself out because it wasn’t getting clean power. Easily remedied with a reset on the controller. With 5 years parts and labor left on my warranty I would do it again. The well has a 50 year warranty which will be far beyond my need for it.
If you do decide to install a Geo do some research on the local installers, then do some more. Then after that do some more. Ask for 10 references and to visit a current and past installation.