Professional, honest, and they'll do it right.
Just give Guthrie & Sons Heating and Air a 6. They're very knowledgeable about about high-tech systems, thoroughly honest, and pleasant to work with. I wish all contractors could be so professional.
They go above and beyond, and even their office personnel are pleasant to work with if you have something like a change of schedule. They're all bright guys. If you're ever in San Diego and need HVAC work done, get in touch with Guthrie & Sons 'cause they're the best.