Had a Geothermal unit installed 2005 to provide heat and AC to whole house? Contractor of course went belly up about 2 years later and of course that's when the unit stated acting up. Many authorized installers for the manufacturer in the area but almost no authorized maintenance, or at least no one who wanted to respond to a trouble call.There's more money in installations than repairs it seems and I guess you need to know less as well. Over the next 2 years we used 3 other services; 2 no longer exist and the third makes Lowe cheap by comparison... Finally after aggravating the manufacturer enough, they responded and suggested Lowe. Are they pricey? Definitely. Are they good? They're EXCELLENT. When they responded to my first trouble call, 2 service men showed up, looked at the installation and said and quot;Wow. Who did this?and quot; and called in their supervisor. Over the next 2 days they diagnosed back and forth with the manufacturer. Initial price to me? before repairs $98 service call. Once they had the installation understood, they fixed 2 leaking valves (geo system replacement parts are notoriously overpriced; just do a web search). Lowe charged the same price as the best price I could find on the Internet. After that, once a year diagnosis, cleaning, adjustment, etc. under maintenance contract both maintenance and subsequent repair calls are discounted. Valves leaked again in a bit over 2 years; sulfur in the water corroded the parts. Lowe suggested a different, cheaper, stainless steel unit. 3 years now, no leaks. This last repair was for a part I think began failing soon after installation but because it showed no diagnostic errors, is difficult to prove. Since it was replaced, the system runs flawlessly, better than when new. The company is a bit pricey, but they are true to their estimates, no matter how long it takes. Some of their estimates are outrageous so I laugh and look elsewhere. BUT THEY COME WHEN YOU CALL, and when it's cold outside and the heating system is down, that's what I need. They are clean to a fault, booties on shoes before they take a step into the house; refuse cleaned up and taken away. About everything I want in any type of contractor or service; high quality service that is there when you need them. I'll gladly pay a bit extra for that.