Replaced approx 4 years ago, both of our systems are 2-stage 16 SEER units from Amana that employ advanced communicating system technology and ComfortNet CTK01 display thermostats. We have really enjoyed and benefited from the excellent efficiency of these units. Recently, one of our ComfortNet displays displayed the error "Call for Service". The original installation (by another provider) had gone So poorly that I would Not call them back for the repair. I decided to check both the Amana website and Angie's List for trained and recommended companies who could repair these Amana communicating systems. The first company I called sent a tech to my home; however, he was unable to repair the system since their only Technician who had completed training on these communicating systems was currently unavailable. The tech who showed up said he had to leave town for a couple of days and that he would call me back to reschedule a time when he could return to my home and call Amana's Dealer Tech Support personnel so they could talk him through how to repair the system. (Not confidence inspiring). The second company I called was Spring Woodlands Air Technicians. Todd and his assistant Brandon came to my home the following afternoon when they said they would. They were both very courteous, very professional, and they knew what they were doing. The tech from the other firm who had come the previous day had told me, "The heating vent pipe for one of your units was completely disconnected, was probably leaking carbon dioxide into your attic, so I turned off the gas because it was unsafe." In contrast, Todd from SWAT (without me having mentioned anything) told me he had noticed that the heat vent pipe was disconnected and the gas was off, so he simply reconnected the vent pipe to the unit and turned the gas back on. (Probably took him 30 seconds to do so. I was immediately impressed.) Todd and Brandon checked and took measurements and discovered the fan motor on my Amana 16 SEER 5 ton unit needed to be replaced (part was under warranty). I also mentioned that my outdoor temperature sensor for the unit saying "Call for Service" had not registered a correct outdoor temperature for years, and he said it could also be replaced under warranty. (Before it was repaired by SWAT, one ComforNet display showed an outdoor temperature of 75F while the other one showed an outdoor temperature of 165F. Clearly not accurate!). In addition to the repairs I had requested Todd noticed the intake plenum on my other unit was coming detached from the Air Handler / Furnace. He said the repair was very easy and agreed to fix that also. Altogether, I was Very pleased with the service I received from S.W.A.T. and would highly recommend them. Todd was extremely knowledgeable and knew exactly what to do to repair my system. Thank You SWAT!