We have been talking to companies about getting Geothermal installed in our 200 year old, stone, 1500 sf home. (Currently have oil hot water radiators and a central air unit.) I have read the sticky threads but have not seen some of my questions answered. At this point, we hear some of the same things from everyone, yet some very different, and are not sure who to believe. We are Not "handy" so I need to make sure that I'm choosing the right people and right brand. I would not choose someone with less than 15 years experience with this, so that is not an issue. 1) We have a large enough yard (1.3 acres all out back) to do horizontal, but the companies all want to do vertical. Of course, we know that is more expensive, but what would the benefit be of one over the other? 2) Several have suggested a 3 ton system. One has suggested a 2 ton, which he says is really 2.75 tons, and that 3 tons are really 3.75 or thereabouts. Our central air is a 2 ton system (according to Mr. 2Ton geothermal) and cools our house well, even at higher temps. I have not seen much written about 2 ton systems so I wonder - should we do 2? Or 3? We are in southeastern PA, and last winter got several feet of snow. Some, on the other hand, we get none. BTW we keep our heat at about 57 degrees all winter, use a propane fireplace insert in the living room while we are in there. My January oil bill was $700. That's with the Oil Hog set at 57, 24/7. 3) This *is* a 200 year old stone house w/cedar shake roof, stone basement, and there are some insulation issues. One said we are not a good candidate, others said we are. It's not our windows, they are tight. I do plan to put extra insulation into some of the floor areas, attic, etc. Would geothermal serve an old place like this? 4) The basement holds the heat in really well over all seasons (thank you, oil burning hog)...will the geothermal unit also make it hot down there? You don't know how much wine we ruined when we first moved in - our last basement was COLD! 5) One guy is trying to say we need a UV light. Something about mold in the A/C vents... We do have a major water filtration system, which includes 3-4 tanks and a UV light. Not sure how the extra UV light fits into the picture...How do we know what's a bogus add-on and what's not? One of the guys gave us an estimate and added all kinds of things at the end that were optional. Another *said* "well, this might be needed and that" - *after* giving us the estimate. We *know* we will need additional duct work in the kitchen and maybe 2 returns. I just am not sure of all the other stuff. 6) When I asked about using the radiators instead of forced air, another guy said "well, you should have another Oil Burner as a backup." Huh? I thought I wanted to get rid of the oil bills.... Is it possible to use radiators without the oil heater? Or do we have to do the air vents? 7) Any brands you would suggest staying away from? Any which are more highly recommended than others? ClimateMaster has been the one most of them use, also Carrier and Trane. 8) And, how long of a warranty should we ask for, and for what? Sorry so many questions - I just want to head off problems before I sink so much money into something entirely new to us - thanks!!