I'm an HVAC Maintenance employee for the local hospital in Roosevelt, Utah.
I've been designing, installing, selling, maintaining, troubleshooting, etc HVAC systems since about 1995. The economy got so bad here that I had to go to work for someone else...the hospital.
Anyway, I've focused on geothermal heat pumps since about 1995. In 2001, we started specifically using EarthLinked direct exchange geothermal. I know that will discredit me for some people, but it shouldn't. We've had great success with them, and I love mine in my own house. We've also had great success with water-based geothermal. They both have their place. They both work great, and they both save lots of money.
Lennox is the brand we've used since 1965 for furnaces. Recently, though, I haven't been all that impressed with customer service, so I tend to use many brands now.
Not sure that many people even read the intros, so that's probably enough about me for now...