Bosch Large 5-Inch Full-Color Touch Screen Sleek Easy Setup Connected Control Smart Phone Wi-Fi Thermostat for 24V HVAC Systems with Bosch Connected Control App

First I'd like to acknowledge that these BCC100 t-stats got a lot of bad rep on Amazon. My personal experience is categorically different so much that I've upgraded both of my t-stats to BCC100 and have been super happy with my decision. I should also mention that I received no incentive from Bosch or Amazon and paid full price for both units purchased here on Amazon.I spent many hours researching (universal) t-stats online and landed on Bosch because I generally believe the company makes great products/tools/hardware and I didn't care so much about the 'smart' Wi-Fi features which seemed to be the source of the bulk of the negative reviews on Amazon, which were predominantely Wi-Fi connectivity complaints. We had a brand new Lennox system installed at our old house with the latest color-LED t-stat that I loved (no Wi-Fi tho). I paid $450 just for the t-stat alone (installation excl). When we moved to our new house, we inherited two old t-stats that had the standard on/auto fan function and required the user to manually switch between heat and AC, etc. I thought at $150 for a Bosch BCC100 t-stat, I'd give it a try.The reason I landed on BCC100 is a) I wanted something that's fairly universal/compatible with my HVAC system (more on that below), b) allows me to simultaneously set heating and cooling thresholds (e.g. heat up to 70F and cool down to 76F), c) allows me to run the system fan in 'CIRCULATION' mode, d) has a built-in humidistat and is able to control a humidifier accessory, e) has color LED display and is easy on the eye and f) is relatively affordable.a) My HVAC setup. I have a newer American Standard 2-stage furnace (i.e. Trane), a newer large-capacity 2-stage York AC unit, an Aprilaire 600 whole-house humidifier, an older 2-zone ECU that operates the entire system and two t-stats (one for each zone). I installed the BCC100's myself and have had the system running without any issues for 6+ months prior to posting this review. I'm extremely satisfied with my choice to go with Bosch and here's why.b) I'm able to set the low and high thresholds for AC and furnace at the same time and don't need flip a switch to go from heat to cooling or vice versa. The BC100 t-stat handles both call automatically. This is especially helpful in the Fall and Spring time here in the midwest when the temps drop below 50F at night and can easily reach above 80F during the day. BCC100 can kick in the furnace at night and the AC during the day with no action needed from me.c) We've had some major hot spots in our house (e.g. master bedroom) where the temp difference could be 3-5F degrees off compared to temp on t-stat, making it very uncomfortable. We'd faced a similar issue at our old house and found that, aside from upgrading insulation and seeking the air leaks around the house, the next best thing was to get a t-stat that has a fan 'circulation' mode. The circulation setting basically allows you to cycle the HVAC independent of furnace or AC calls. That made a huge difference in our comfort. We have fan circulation set to 20 mins ON, 30 OFF round the clock. That did the trick for us - no more hot spots!d) I'm able to set/control humidity from our BCC100 t-stat in conjunction with our whole-house humidifier accessory. You can use the H/DH and C terminals on BCC100 to trigger the humidifier. For our setup, I wanted to have BC100 turn on the humidifier whenever the fan is on vs. running the humidifier only when the furnace/heat setting is on. BCC100 interface allows you to select between 'steam' and 'evaporative' humidifier settings. I used for former to be able to run our humidifier regardless of the heating calls to the furnace. I don't have a dehumidifier installed at our house, but BCC100 also allows you to control a dehumidifier accessory. It uses the same D/HD terminal so you can only run one at a time, either a humidifier or dehumidifier. I should also mention that I used a simple relay switch to power our humidifier as I don't think that the BCC100 is able to power our Aprilaire 600 humidifier unit on its own. I used the signal from the D/HD terminal on the t-stat to energize the relay and close the power circuit from the furnace ECU to the Aprilaire unit.A couple months after the initial install I decided to try out the Wi-Fi connection. I was half-expecting to do a hard reset and then ultimately disable the Wi-Fi feature based on the negative reviews. To my surprise, I've had zero issues with my Wi-Fi setup on both BCC100 t-stats or the Bosch iOS app on my iPhone. Don't know if my Wi-Fi settings are more conducive to a flawless Wi-Fi integration with these units or if Bosch had fixed the previous software bugs with the current software release, but I'm thrilled that I'm able to use the iOS app and change my t-stat settings on the fly from anywhere on my iPhone. I honestly didn't expect the 'smart' Wi-Fi features to work at all so this was icing on the cake for me. Since I'm an iOS user I can't say if the app works as well on Android devices. I provided a few details about my setup below if you're looking to troubleshoot or replicate a stable setup at your house.Bosch iOS app version: 2.5.0Bosch t-stat software version: 1.5.0 (the t-stat came preloaded with v.1.4.4 which I had upgraded to 1.5.0 once I had it connected to Wi-Fi)Wi-Fi connection: BCC100 will only connect on a 2.4 GHz Wi-Fi network, so that's something to be aware of. If you have dual-band Wi-Fi set up at home (5GHz and 2.4 GHz running simultaneously), you'll want to make sure you're using separate SSIDs for each band (e.g. XXX_5G and XXX_2G) and connect your BCC100 to the 2.4GHz SSID. The units are stable with 'WPA2-Personal' network encryption. I also have a very strong Wi-Fi signal to both BCC100 t-stat units which alone can make or break the entire experience.I don't know if this product is for everyone, but I personally love it. Hope this review helps you make an informed decision prior to purchasing this product. Cheers.

I have owned this thermostat for one year and four months. I do NOT recommend this thermostat and below is my full review and the reasons why this deserves a one-star rating.A little background. I need a thermostat with two requirements: Set my schedule by time of day, and connect through my phone to make temporary adjustments. I live in an area with time of use electricity rates, so I do not need a learning thermostat -- I know when to turn it on and off. I also wanted the ability to connect through my phone to verify the current temperature and if we have a longer than expected day away from the house, we can temporarily adjust the temperature.Looks: This thermostat looks nice hanging on the wall, has a large colorful screen, and has a white bezel.User interface: The interface and menu layout are well thought out and easy to navigate. The hold and temporary function are not as intuitive as they could be, but ok once you get used to it. The advanced functions require an access code in the manual, so each time I want to check them I have to find the manual. The schedule setup is a little clunky, but works once you work through it.Technical Support: As you will read below, I have made several calls to tech support. Each time they were helpful, kind, and informative – but usually unable to solve my issues.The reason I cannot recommend this thermostat:The Software: The problems with this have been ongoing since day one -- if it’s not one thing it’s another. For the first six months the device would randomly not connect to the thermostat or allow me to make temperature changes from the app. Sometimes it would respond, but not allow us to release the temporary temperature hold. I could fix it by pressing the little reset button on the actual unit – little use when I am 50 miles away from home.Approximately 3 months ago Bosch had a major software update for the thermostat and phone. Everything worked great for 1 month, but one day the unit would not connect to my home wifi. I contacted tech support and they were having an issue since the update and to try again in a couple days. Why my issue started a month after the update, nobody knows. It took about a week, but then it magically started connecting again. It worked for about a month and then the clock started displaying the wrong time. I would try to set it manually, but that caused it to set to a different time entirely – truly bizarre. This is crucial to my time of use electric plan, if it has the wrong time and turns on my AC unit during my peak electric rates only one time during the month, it would cost me enough to pay for the thermostat. The time issue seemed to resolve itself after about 2 weeks. The latest issue that prompted this review is last week is my app now says I do not have a supported device and I need to sync it with my app. I follow the setup procedure and it gives an error, cannot sync.I thought for sure they would have fixed it after a year and a half of owning it, but new problems continue to pop up. How can Bosch sell a product that just plain doesn’t work and continues to have problems? All I need out of my thermostat is set a schedule and connect remotely. After a year and half of continuous issues I’ve decided to write this review to let people know you will be constantly fighting this thing.Update February 2021: My last update. It has been relatively stable for the past few months, still wont connect about 25% of the time when we are away from the house. Bought a Nest E thermostat installed it and have not had a single issue or hiccup in 4 months. The Bosch went in the trash, I can't even bring myself to give it away.