text: had to return this. Installed per instructions and still didnt work. Called NEST customer service and had me switch wires around over 10 times..It got annoying because my circuit breaker is down stairs. I lost about 5 pounds that day..Customer service finally told me that maybe I installed unit incorrectly and that I needed to pay more money to get a NEST PRO out there. I said NAh im good and i told them I will just install my old thermostat.. He said it wouldnt work. I hung up on him and installed my old thermostat. Worked perfect. Wish he would have just listen and sent a new unit.