Flagstaff Comfort Systems (FCS) sets the bar high with every interaction. We used FCS for both our heater replacement and an air conditioner installation. The owner, Steve, and his son were fully approachable, timely, and competent. Moreover they were very careful with our home/belongings and left no indicators of construction behind for us to clean. They were equally patient as we connected (and learned) the new control schema to our home network; so glad we sprang for the connected thermostat (e.g. I no longer have to leave bed to alter the temperature for my lovely wife). We could not be more pleased with FCS. Steve was even helpful beyond the install, correcting a warranty status error for us (that originated from the manufacturer). Full marks for Steve, son, and everyone at FCS. We would hire them again without hesitation.