If you have regular 20th century thermostat, by all means, use Griffith Energy. If you own a Nest thermostat, AVOID Griffith Energy. I don’t fault the technicians so much as I fault Griffith itself for not training these guys. As for why I’m giving them 1 star…. I have two Nest thermostats in my house, upstairs and downstairs, both are using the Trane XR-13. Upstairs, cold air stopped blowing, so I called Griffith. Their tech, Matt determined that the issue was a blown capacitor on the condensing unit which is fairly common. He also noticed that the relays weren’t making the best contact and I said “you’re the expert”. After working for must’ve been an hour, he had power to the fan but my Nest thermostat indicated that there was no power to the Rh terminal. He then said “show me your attic” and proceeded to look at the air handler. He said that he somehow popped the breaker to it and it needed to be reset which he did but my Nest, when looking at the wiring diagram indicated that there still was no power to the Rh terminal. While I was pointing that out to Matt, he said “I’m seeing it up here so I don’t see what the problem is”. He then checked the voltage at the red wire at the Nest base and sure enough it read 27 volts before entering the Nest base. So to further troubleshoot the issue, I brought the Nest unit downstairs and sure enough it worked fine. Upon being plugged in downstairs the unit’s error message indicating no power to Rh went away. Nest thermostat is ruled out as a problem. it worked fine put onto a base where the Rh line was working. Matt, apparently in over his head, called his cohort, a smarmy tech named Michael who then came out and quickly diagnosed the issue as a bad Nest base. He pointed out “We hate Nests, they do this all the time”. I already knew what kind of tech he was, uneducated on modern technology and condescending on top of that. I’ve been a software engineer, a LINUX one, for 20+ years and, I have embedded linux experience to boot. I retrieved my old Trane dumb thermostat and Michael quickly did a **** poor job of just screwing the two small screws right into the drywall. Really frustrated by this time, and just to get rid of these two techs, I just paid the bill. $119.00 “Response fee” and $248.00 for a capacitor replacement which is a ghastly markup but hey, they have to make money, so that’s understandable too. No mention of replacement for the relay. I took the “defective” nest base unit downstairs, plugged in the wires downstairs he was right, the base unit was blown. Recap. Upstairs unit was blowing cold air and the Nest thermostat was working fine. Capacitor was replaced which should have solved the problem, again the thermostat was NEVER the issue. Tech decides to monkey with the relay and blows a breaker in the air handler and, WOW! coincidence of coincidences, your Nest base unit is bad now. I called Nest support and they said this thing happens all the time when HVAC guys who know nothing about how a Nest works, and they do their monkey business of hot wiring circuits will oftentimes blow out base units because, contrary to how they appear, base unit are NOT just simple terminal blocks. They have have soldered fuses wired in to protect the actual Nest itself from just the very shenanigans that Matt was performing. Now I want to call another HVAC company just to verify that everything is working ok. So while my upstairs air conditioning was fixed, it came at the cost of me having to replace my Nest base unit, so Griffith gets one star for fixing my problem. My advice is to completely ** AVOID ** Griffith if you have a Nest because they are completely incapable of understanding the technology at this point. Griffith needs to do a better job of training their techs on the latest technology ( and Matt gave it his best shot with his limited knowledge ) and in the case of customer service, educating smarmy techs like Michael.