• 2.0 out of 5 stars

    Once a avid backer of Nest. Might be again, if.....

    • Written by from Ramsey

    Had a GEN1 Nest. It did not want to switch to heat in the winter. No problem. Gave it to a friend who loves it. Purchased a GEN2. Wonderful. Does everything I want until now. Not heating properly because ambient temperature states 75 degrees F. Removed Nest module and felt back plate. Warm. Looks like Y1 FET blown. When I removed Y1 wire, FET cooled down. It is less the 20 degrees F here in Minnesota. So my thermostat was running the heat and also trying to activate the A/C. Fortunately at the end of the cooling season, I had removed power from the A/C.
    Now as a test engineer with almost 30 years of experience and also with an engineering physics background I know my way around circuits.
    Nest has a very serious issue with how they dealt with the 24VAC input power. Their circuit is not fault tolerant for the fact that the 24VAC is unregulated and can vary quite a bit depending on input voltage and load conditions. The 24VAC technology was designed when the world was analog and the voltage was used to switch mechanical relays. Nest needs a solution that protects their wonderful implementation. Isolation, solid state relays, an actual power control/condition/switcher. Pick one. Looks like a group of digital engineers approaching problem from digital side with little experience with analog and HVAC. Their competitor is approaching the market from the HVAC side with not as much talent in the digital side.
    Will invest in Nest when they get their power supply situation worked out. This is not a compatibility issue as 24VAC transformers exist on most furnaces. If you do not think you have power spikes, the only way to be certain is to have some type of power conditioning and/or surge protection at the 110V input to the furnace.

    21 of 21 people found this useful

  • 5.0 out of 5 stars

    Easy to Install! Save a lot of Money...

    • Written by from Washington

    My old neighbors had the first generation NEST and they swore by it. They told me that in a couple of months (3 in total) they had already saved as much money as the NEST had cost them. I was a little suspicious of the hype behind it all, but after the second generation NEST came out, I finally gave in and bought it.
    It took a little more than 30 minutes to install and just watching the video that NEST has on the website is enough for you to do it.
    After a week, it learns your pattern and makes one initial one for you to save money, but it never really stops to learn. Its AWAY mode is brilliant and having access to it on your iPhone or computer is priceless... I would highly recommend it to anyone...

    28 of 36 people found this useful

  • 1.0 out of 5 stars

    Nest is Junk

    • Written by from Minnetonka

    Woke up one morning freezing and found that the Nest "learning" thermostat had stopped communicating with my furnace. Tried to turn the heat up and received a low battery message. Called support and they assured me that after charging the thing with a phone charger that it would work again. Temps went to -15 in MN and I woke to a temp of 49 degrees inside my house. Called customer service again and spent over an hour trying to correct issue until they decided it was time to send me a warranty replacement. It took over 3 days for this to arrive and the customer service rep told me that I should go to the hardware store and purchase a traditional thermostat if I hadn't saved my old one to keep my pipes from freezing in my home! Warranty replacement still does not work, I've spent way more on electric bills to run space heaters while the furnace was out, missed a day of work to install emergency thermostat so my pipes wouldn't freeze, I have an 11 year old son who couldn't sleep on a school night because it was bitterly cold in our house, spent hours on the phone with nest "technicians" . Do yourself a favor and buy a normal thermostat, I wish I would have.

    23 of 28 people found this useful

  • 2.0 out of 5 stars

    Artistic physical Design but has technical issues

    • Written by from Anaheim

    The Nest learning thermostat is very attractive when installed on your wall. It is easy to install and the instructions are very clear and quite simple.to follow. I took me about 20 minutes to complete the installation and have my system running. As advertised it will learn your schedule automatically or you can program it manually. You can adjust it remotely using your iPhone app or from any pc or apple computer after you download the software from Nest.
    The bad news is that even though it is advertised as a thermostat which is supposed to control the temperature, it is absolutely terrible at doing this. For example in the COOL mode I set the temperature to 76 degrees. The room temperature has to rise until almost 78 before the thermostat switches on the cooling equipment and then fall to almost 74 degrees to turn it off. This huge 4 degree "dead band" does not provide a comfortable living space since you go from warm to "freezing" rather than a comfortable 0.5 degree differential. This also increases energy usage. Contacting Nest only confirmed that this is the way the thermostat was designed to operate. Very poor answer and I have since replaced Nest with another manufacturer's model which operates to my liking, I do not recommend this product.

    18 of 19 people found this useful

  • 2.0 out of 5 stars

    Nest Issues--New Paperweight

    • Written by from Phoenix

    I bought my Nest approximately 8 months ago. It worked perfectly until 2 nights ago. It then started turning on the heat and cooling at the same time. My a/c-heat technician says the baseplate shorted out and now won't work. Crazy money for such an imperfect and short-lived product. I gave it 2 stars solely because I like the visual design so much--otherwise, it is a waste of dough.

    19 of 21 people found this useful

  • 1.0 out of 5 stars

    The Nest - Problem after problem

    • Written by from Wayne

    The Nest upgrade to v 3.5.1 (7.1.13) software has created massive connectivity issues (failures) for me (Apple Routers) and others. See Nest community form. Very disappointing product.

    20 of 23 people found this useful

  • 4.0 out of 5 stars

    C wire needed but then all is good

    • Written by from Glenwood

    Good - easy to use free app, sleek, simple, great phone help

    Bad - needed C wire, suggested Pro install would bump cost into other more robust system price range such as Honeywell

    I was lucky I had an unused wire in the wall and was able to run 24v from my plenum heater panal. Happy now, but almost did not work. Talked with a local installer who said he always ran C wires to the unit.

    21 of 25 people found this useful

  • 5.0 out of 5 stars


    • Written by from Dollard Des Ormeaux

    This product is amazing! You can control your thermostat from wherever you are whenever you are. Don't worry if you've been gone for 2 weeks and you think all the air conditioning has gone to waste and will cost you a ton of money because with the Nest you can put it to a certain setting so that it will save you energy and money.

    24 of 31 people found this useful

  • 1.0 out of 5 stars

    Too much trouble - energy cost increased.

    • Written by from Loveland

    First off, I'm very tech savvy, over 20 years in electronics design and software engineering, so I'm capable of following basic installation instructions. I was quite interested in the Nest thermostat. My house is heated and cooled by a newer heat pump. I dutifully took a digital photo of the connections to my old thermostat and sent them to Nest. When i called, I was assured that the 2nd generation thermostat would work fine with my system. Nest even sent me an email with wiring instructions. This would be a snap, I thought.

    All seemed fine at first. Then, during a twice-yearly HVAC service, the tech asked me why I had the emergency heat on all the time the unit was running. I was puzzled. He showed me that it was indeed running on emergency heat. After a couple of calls to Nest tech support, I gave up, reinstalled the original thermostat, and returned the Nest for a refund. Then - insult to injury - I received an electric bill that was nearly 3x normal - emergency heat is expensive! I could have bought 2 more Nests with the additional energy cost. By the way I checked, double checked, and confirmed with Nest support that everything was wired and configured correctly.

    Not a happy outcome.

    18 of 20 people found this useful

  • 1.0 out of 5 stars

    Does not work in cold weather

    • Written by from Hanover

    I have had HVAC technician talk twice with NEST to get it to operate correctly. In single digit weather the system would only blow cold air. Change system back to Honeywell thermostat and house is warm. Also, does not work with changeable fan speed system. I gave it a year to learn but to no avail.

    19 of 22 people found this useful

  • 1.0 out of 5 stars


    • Written by from BABYLON

    I am an architect and we were pretty excited by using this thermostat in several of our projects. One third of them couldn't even connect to the equipment they were suppossed to regulate even though they were compatible as per Nest's list of compatibility. And the other third would work OK for one week and then die.
    We tried working something out with Nest.com directly but they do not have real Customer Service. If you call, they'll have you waiting for one hour and then the call will magically fall and they will never follow up nor answer your emails. DO NOT BUY THIS PRODUCT. IT'S A NICE CONCEPT, BUT IT DOESNT WORK YET!!! SO FRUSTRATED BY THE LACK OF RESPONSE OF THIS COMPANY. NEVER AGAIN!

    18 of 21 people found this useful

  • 2.0 out of 5 stars

    Poorly Engineered Product

    • Written by from Mississauga

    As previous posters found out with hefty install bills from HVAC techs, being electronic / electrical literate I decided to do the install myself. If you are not colour blind and can meter voltage at wiring it should be a no brainer to troubleshoot or transfer wires off an existing thermostat right? Wrong. These things indeed have baseplate resistance or bad terminals on them, the firmware is not up to recognizing that either - I went through 3 and about 8hrs of troubleshooting, ended up running completely new thermostat wiring from the furnace controller just to rule out any resistance off the old wiring. In the end I think that did the trick, these things require clean 24V at RC / Y1 / Common or forget about it. And of course each time I put the old thermo back in on the old wiring, it worked! But I could never get the thing out of these E30 errors, either no power to Rc or Y1. Who knows, 3rd product was the charm I guess and new wiring (18 gauge). My local Home Depot gets more back than they say stay out. However, thumbs up to the software, they got that down right. I should also say I put in 2 Nest Protect C02 units, both function perfectly.

    19 of 23 people found this useful

  • 1.0 out of 5 stars

    Not worth the money

    • Written by from Sandy Springs

    First - Nest lacks the most basic of thermostat functions: Hold Temp. Enthusiasts will tell you the Nest features eliminate the need for it, but Friday was a holiday and there was no way to tell the thing not to run the usual weekday program.

    Second - Auto Schedule makes random unexpected changes. The ability to confirm those changes would be great. My thermostat decided that I didn't want the temp to drop to 70 degrees at 10 PM anymore and cleared that part of the program even though if I made that adjustment, I only did it once. So Auto Schedule is off.

    Third - Auto Away overrides the schedule. So rather than having a comfortable temp in the house when I get home from work, like the program is set for, the thermostat goes to Away when I am at work and I have to interact with it to get it to run the program. What is the point of a schedule if the thermostat doesn't follow it? So Auto Away is off.

    The novelty features of Nest don't really work. I'm pretty sure that the thermostat is not smarter than I am, but it thinks it is and does things it thinks I want. I shouldn't have to interact with my thermostat regularly to get it to do what I want it to, but that is what the Nest requires.

    There are less expensive wifi connected thermostats that do what the Nest does. They don't have the fancy metal ring around them, but that is about all you are getting for the extra money. I wouldn't buy another one.

    18 of 22 people found this useful

  • 1.0 out of 5 stars

    Total POS

    • Written by from Alton

    These things are horrible. I have spent hundreds of dollars on HVAC repairs that always end up being the mystery "low battery" phenomenon. I am about to remove all 6 units and replace with Honeywell stats. Oh, they are very pretty but that is all they are.

    16 of 18 people found this useful

  • 4.0 out of 5 stars

    Once its properly installed it is great.

    • Written by from Maple Ridge

    I had a two wire thermostat, gas fired furnace installation.
    While the instructions state that this type of installation is straight forward and will work, it quickly became apparent that this is not the case.
    The unit has an internal re-chargeable battery that charges itself while the heating circuit is closed and the furnace is running when in used a two-wire thermostat system. The problem with this is that the heating system may not be active for a long enough time to fully charge this battery.
    This was the case in our installation and it was not long (about 10 hours after installation) before the battery was discharged to the point where the Nest would not function.
    To ensure that the battery does charge on a regular basis I ran a third wire from the thermostat to the furnace and connected this to the continuous low-voltage supply at the furnace thermostat wiring panel. This wire is referred to as a "C" wire and the "C" terminal on our furnace wiring panel was clearly marked with a "C" making it easy to complete this installation on my own. Having done this I have had no problems with the unit and it works exactly as promised in all of the literature.
    The "self learning" function works great and the ability to activate and control the Nest from wherever I have an internet connection and my iPhone or iPad is outstanding.
    We have been using the Nest for over one month now, during a particularly cold period, and can already see a difference in our overall power consumption. While this may be due to any number of other factors I feel that this product has contributed.

    20 of 26 people found this useful

  • 4.0 out of 5 stars

    I was skeptical

    • Written by from Holly Ridge

    I recently purchased my first home and the first thing that I noticed was an incomprehensible programmable thermostat. The instructions were provided, but the thing requires an advanced degree of technical expertise in order to operate it... oh and it was beige and ugly. When I did use it, I would change the temperature manually but even then it would 'forget' after a day or two and return the temp to some hidden factory setting stored in its memory.

    Being a gadget-geek, I was browsing the Apple store for one of my wife's christmas gifts (an iPad mini which she has yet to put down... the diamond tennis bracelet however is still in the box. I love my wife!) I noticed the nest and made an impulse buy mostly for the elegance of it's design and implied ease of use. Upon installation, I was not disappointed. I did my own installation. As other owners have mentioned, the Nest is MUCH smaller than a typical programmable thermostat. I for one broke out the plaster, sandpaper, and touch up paint... I like things that are simple and intuitive. You can use one of the enclosed backing panels, but it simply will not be as clean and streamlined.

    I love the iPhone and iPad apps, which allow me to create a manual schedule - a constant 68 degrees. And when you set it at 68, that is where it stays. That doesn't sound like much, but it was a new experience for me... a much appreciated one.

    The only issue I had was connecting it to my Airport Extreme. I maintained a hidden network, and Nest simply could not maintain a connection... after calling customer support (who are amazing) I decided to unhide my network and it worked without issue.

    19 of 24 people found this useful

  • 1.0 out of 5 stars


    • Written by from SODDY DAISY

    I have been a NEST devotee for 3 yrs. We have 2 installed and they worked with amazing performance until about 7 months ago when software upgrades began. Now the app shows OFFLINE randomly, the thermostat is connected through my Airport (all my WIFI stuff is Apple and nearly new) so I have no remote control. Then I have to touch the dial to get it to connect thru the app. What are they thinking?? NEST support has become a little more responsive in the last month, but even after warranty replacements, the two new units act the same. APPLE--you need to pull this product from your stores until NEST PROVES they have fixed these issues. There are HUNDREDS of threads on the NEST community forum, on these reviews, and on public blogs about this horrendous issue. There is no recourse here but to strangle their business. These problems will occur to every one who buys these, it is just a matter of time. Please pull this product until they get this fixed!

    14 of 15 people found this useful

  • 1.0 out of 5 stars

    Check the type of system you have before buying

    • Written by from Toronto

    I am the owner of a 1st generation Nest Thermostat. It worked amazing with my old single stage mid-efficiency furnace. The furnace quit last week and I replaced my furnace with a 95 percent high-efficiency furnace with a dual staged fan. Nest thermostats (1st & 2nd generation are not compatible with furnaces with multiple stage fans - as per Nest Technical Support. I had to revert to using my old programmable thermostat and I am now the owner of a $250 hockey puck.

    17 of 21 people found this useful

  • 1.0 out of 5 stars

    Wish It Was 5 Stars But It's Only 1 Star

    • Written by from Greely

    I was so excited to order this product when the gen 2 first came out - the concept is great and the user interface is wonderful. Unfortunately the build quality Is so poor that everything else doesn't matter.
    When my heating / cooling contractor installed it for me (I have a ground source heat pump so Nest recommended a pro install) a year and a half ago - it was his first experience with it and he was impressed but not as quick to convert as I had been.
    Just to be sure everything was good - my contractor talked to the Nest support group when first connecting and everything went well.
    Suddenly 6 months later in the middle of the winter - the thermostat started sending a cooling request at the same time as a heating request to my heat pump which left me with only air conditioning on a very cold day. Even after changing the mode to heating only it continued to send cooling requests.
    My contractor came out and after conferring with Nest support for about an hour, they finally agreed it was a defect and arranged to send me a new one.
    In the meantime my contractor disconnected the cooling wires at the heat pump so that the thermostat couldn't try to cool the house (it was -10C outside).
    When the new one arrived a week later - I hooked it up, had my contractor come back to reconnect the cooling at the furnace and we were OK again.
    I thought this was a fluke and went back to singing the praises of the Nest Thermostat to my friends.
    Now it's the middle of the winter again and suddenly my furnace is making a terrible sound and my house is freezing.
    Contractor is back and the replacement thermostat has begun sending simultaneous heating and cooling request (actually only a 15v cooling request but a 24v heating request).
    This time the defective (again) thermostat damages my reversing valve.
    With all the visits and now repair charges - my contractor has cost 3 - 4 times the value of the thermostat and he has now had enough experience with them to tell me this is not a fluke. The electrical circuits are cheap and these problems are cropping up fairly regularly.
    There are other alternatives now and I can't afford the cost or headache of sticking with this Nest thermostat.

    15 of 17 people found this useful

  • 1.0 out of 5 stars

    Does not work!

    • Written by from Gloucester

    After purchasing the Nest thermostat at my local Apple store (along with $2,500 worth of computers), I installed the Nest in my vacation condo so I could turn up the heat before arriving after a prolonged absence. Three days after I left, the wifi quit. On returning to my cold condo, I installed a new router. A few days later over the holidays, the Nest wifi controll quit with a "low battery" warning. (The router is not the problem.) With sub-zero temps outside, the Nest defaults to a dumb thermostat...a very expensive dumb thermostat. At -8 degrees F, can it be trusted to keep the pipes from freezing? Bottom line: easy to install, very pretty, doesn't work. (Apple: warn your customers!)

    19 of 25 people found this useful