Bought a brand new, top of the line Carrier furnace with wifi thermostat. After a few months, the wifi thermostat lost connection with the furnace and didn't work properly. I called the owner of RJ and he said "no problem" and to let me know if it continued (we were waiting for a software update). After a few months, winter came and the thermostat still had issues. After it got cold, the furnace itself also developed an issue where water built up in the CARBON MONOXIDE exhaust so I called them again. This time, I asked them to reimburse me on a new thermostat and fix the issues. After two months and THREE VISITS and three different stories, they fixed the issues, didn't reimburse me for the thermostat, then sent me another bill for "their" time. If you think they stand behind their work, you will be wrong.