(2 of 2 customers found this review helpful)
Don't fall for form over function
Damaged My System
I purchased my 2nd generation Nest in February of 2013 and installed it on my 9 year old A/C and Gas furnace. It was a newer house and had a common wire available so I had no issues needing the unit to steal power that many were complaining about on the forums and reviews. At first I loved it, its sleek lines, the ability to tweak temperatures from my phone while away, the cute little Leaf reports every month. What was not to like? I was under the spell of Nest's marketing and design. All was good in the land of heating and cooling at my house. However, the relationship started to go sour in under a year. The Nest engineers started giving me unannounced, surprise presents in the form of software updates that I had no choice in accepting. Suddenly my previously solid Nest started dropping my home WiFi making it unreachable remotely. Of course it must be an issue with my wireless router not properly supporting the standards (never mind that it worked flawlessly for 6 months). Now when my wife asked me to change the heat/air in the middle of the night I got to walk downstairs to do it. Truly deja vu.<br /><br />Now fast forward another 8 months. I come home on a Saturday afternoon in mid-June from my son's baseball game and the house seems a bit warm. As the day progresses, the temperature continues to rise. When I look at pretty Nest display I see an error message E24 No power to Rh detected. Playing around I find that nothing on my HVAC system is working (A/C, Heat, blower). A call to my friendly HVAC service company determines that the transformer in the furnace has blown. No problem I say, transformers can get old and break. They put on a new one and it immediately fries as well. Further investigation shows heat damage on the controller board as well. I get the quote to fix all the electronics and compare with the cost of a new high efficiency furnace with a 10 years parts&labor warranty and decide to bite the bullet and replace the furnace. They hook up the wires and everything starts humming as expected. All is again good in the land of heating and cooling and I can go out of town on business safe in the knowledge that my family will be comfortable with my new furnace/circuit board and Nest thermostat.<br /><br />Fast forward 7 days. I'm back from my trip and in the basement. I notice that the A/C lines are dripping water and the evaporator coils are iced up. I turn off the system at the thermostat and shortly later notice the outside compressor is still running. I'm not an HVAC expert, but don't understand how that can be. I turned off the thermostat and everything should be off. I throw the breaker on the unit and call the HVAC company and give them an earful. Obviously something was not connected properly on the install or they didn't find the correct problem. Another tech comes out to diagnose the problem. As he enables the thermostat (breaker still off) we hear a loud buzzing coming from the contactor in the A/C unit. He turns off the thermostat again and swaps in a new part, but to his surprise the contactor starts to pull closed as he connects the wire. Did you turn the 'stat on again he asks me? We go and confirm the Nest is still turned off and then head for the basement to confirm the wiring in the furnace again. Putting the multimeter on the board we see the the A/C is still getting a call for cooling even though everything is turned off upstairs. The tech then says the words I can't believe: Looks like the thermostat is causing the problem I ask: Could that be the cause of all the damage to the old system over the past 2 weeks? Very well could be. he tells me. I still have my old Honeywell thermostat from 18 months ago. We hook it up and the A/C and furnace immediately start behaving as expected. **** you Nest!!!. You lured me in like a fool and now you've trashed my system and cost me quite a bit of money.<br /><br />That evening searching on Google and the Nest forums, I start to find quite a few complaints about Nest running the A/C continually due to the components in the backplate shorting out. Search for some combination of: Nest Backplate short Y1 FET. You'll find the threads. Please read them before you buy. Remember, the purpose of a thermostat is to regulate the temperature in your house as well as be reliable. Don't fall for the form over function trap that Nest is laying for you. I find it kind of ironic that Google who now owns Nest is indexing it all.<br /><br />I'll be reaching out to Nest shortly to see what they have to say and if there is any willingness to help offset some of my expenses. I'm not holding my breath, but what do I have to lose? If not, I'm saving my bills and info and waiting for the inevitable class action suit that will be coming. I will update my review when I get my reply from Nest.
How long have you owned it:
More than six months
No, I would not recommend this to a friend.