We were contacted by Devina HVAC via Homestars about a non-functional AC unit in our house. When they got here, they quickly looked the unit over, diagnosed and explained the issue, and installed the required part within the hour, and we have absolutely no qualms about how smooth *that* part of the process was. They were also extremely professional and friendly.
I would only note that getting to this point took about two days, which was a torturous delay during a heat wave. That being said, the arrangement process did span a statutory holiday, so I understand the difficulty involved and wouldn't hold it against them too strongly. All in all, I would still highly recommend Devina HVAC.