Replace Trane Thermostat With Nest

Replace Trane Thermostat With NestSteps to replace Trane with Nest Step1. Your current thermostat is only fully compatible with the Nest Learning Thermostat, 3rd Gen. The TCONT900 is a communicating thermostat so I’m pretty sure you can’t just replace it with a standard thermostat control like a CT100. You should look at the letter designations in your existing thermostat. (This system was installed two years ago by a Trane Dealer) Installing a Nest--3rd Generation Thermostat White wire to W? Red. Nest thermostats are compatible with many different types of heating systems, including boiler systems. The instructions are a bit confusing because there are so many “if/then” options. 235 134K views 2 years ago Google Nest thermostats are designed to work with most 24V systems, even older systems. com/ythiJustAnswer Customer: Can I replace my Trane Baystat 239 thermostat with a NEST Smart thermostat without impeding. Use our online Compatibility checker to quickly check if your heating. 3 Global Revenue and Market Share by. We have a Trane Weathertron Xl1200 heating pump with the thermostat pictured below and are trying to replace it with our new Nest thermostat. Hello: I am trying to replace a Trane thermostat with a Google Nest thermostat controlling a Trane S9V2 furnace and a Trane XR16 A/C unit. The O/B setting is probably selected in the thermostat programming screen on the NEST. 2 Global Sales and Market Share by Type (2016-2021) 3. Smart Thermostat Market Size with Top Companies 2023. Trane ComfortLink II XL950. Step 1 - Select the type of thermostat I want. Their function is to link the thermostat to the HVAC system control panel. The Trane system has two extra wires (brown and black) that are connected to an outdoor temp sensor. TRANE AC TO NEST THERMOESTE FIX DONE. A typical furnace and A/C thermostat will have Terminals for R, W, Y, G and C. Use our online Compatibility checker to quickly check if your heating system can work with a Nest Learning Thermostat or Nest Thermostat E. Transitioning from Trane thermostate to Ecobee without success">Transitioning from Trane thermostate to Ecobee without success. I bought two CT100’s not realizing one of my systems is newer and uses the TCONT900 3 wire. Google Nest thermostats are usually compatible with zoned systems that use multiple thermostats, including zoned systems with dampers. OK it looks like you might have a heat pump base system with auxiliary heating. Remove your existing thermostat’s faceplate and check to see if there is a cable attached to the thermostat’s c terminal. You leave your old Trane thermostat on the wall and plug the Cuby G4 into the wall so it has line of sight to transmit infrared commands. Replacing Trane Thermostat with Heat Pump. OK it looks like you might have a heat pump base system with auxiliary heating. Compatible with most traditional HVAC systems, the wi-fi-enabled smart thermostat comes fully equipped with Trane diagnostics so you can ensure your HVAC system is running at its best. 1 2 › S Sid 03 posted 1 year ago Trying to replace a Trane thermostat with a Nest thermostat and I have just had a long chat with Nest support. I am assuming that the thermostat needs to know the outside temp to know when to stop using the heat-pump and only use the Aux/Nat. Replacing TRANE Thermostat with a Nest Generation …. Google Nest Community Thermostats Install Nest. This item: Google Nest Thermostat - Smart Thermostat for Home - Programmable Wifi Thermostat - Snow $12900 + Google Nest Thermostat Trim Kit - Made for the Nest Thermostat - Programmable Wifi Thermostat Accessory - Snow $1499 Total price: Add both to Cart One of these items ships sooner than the other. Is it possible to to replace Trane XL624 thermostat with Nest. Replace trane xl624 thermostat with nest Help please 🥺 My husband started to replace the trane xl624 with a nest and pulled all the wiring off before taking a pic. Trane thermostats control the heating, ventilation and air conditioning, or HVAC, system in your home. The system has 2 zones with only the thermostat in zone 1 which is the defective one having a switch for switching between heat and cool. R=Red, W=White, Y=Yellow, G=Green. replace my trane weathertron thermostat with…">I am trying to replace my trane weathertron thermostat with…. OK it looks like you might have a heat pump base system with auxiliary heating. Google Nest thermostats are designed to work with most 24V systems, even older systems. They allow you to control… Read More November 19, 2022 In Guides How to Replace Trane Thermostat with Nest Fitting a new Nest Smart Thermostat need not be a daunting project. Step-by-step Trane thermostat replacement Step 1 – Select the type of thermostat I want. Replacing Trane XR401 thermostat with Nest Spent over two hours with NEST support, to no conclusion. I have an old TRANE BAYSENS019A Thermostat ,and i wnat to replace it by the nest learning thermostat. One option to consider is a combination of Nest and Trane products. to/3KqpJgaNest C Wire Adapter: https://amzn. Replace American Standard Thermostats with Nest on Trane AC. My thermostat is a Trane BAYSTAT239A. I dont have a nest yet, I have a trane weathertron and want to replace it with the nest Contractor's Assistant: Is there anything else the HVAC Tech should know before I connect you? Rest assured that they'll be able to help you. Nest thermostat compatibility. The XL824 brings innovative and user-friendly technology to your home, keeping your family and your guests at the optimal temperature in every season. How to replace an HVAC thermostat and install a Nest thermostat. to/37uHrk7New Nest Thermostat: https://amzn. A typical furnace and A/C thermostat will have Terminals for R, W, Y, G and C. 235 134K views 2 years ago Google Nest thermostats are designed to work with most 24V systems, even older systems. the Google Store has a Nest compatibility checker. TRANE THERMOESTAE TO NEST NEW 3RD. Replacing my Trane thermostat with a Nest thermostat">Replacing my Trane thermostat with a Nest thermostat. I am sorry about the “NASA” compatibility checker, the apple autocorrect changed NEST to NASA. Nest Learning Thermostat for a Dual Fuel Heat Pump. However, some zoned systems that require thermostat. Want to install a new thermostat? We sell and install both the Nest and the ComfortLink, as well as a wide array of other thermostats. Check that your thermostat is compatible with Nest. The wire connects the thermostat to the low-voltage heating system. The controllers are wired identically, white to D, red to R, blue to B/C. Got irritated when the instructions were in an app and left it. Google Nest Community Thermostats Install Nest. I currently have a Trane Taystat 340, and I would like to upgrade it to a Nest 2nd generation, I currently have a total of 6 Wires in my wall. Your wires in use appear to be R With a jumper to RC, Y, O, G, W1, W2 and C. How To Replace A Trane Thermostat?. Steps to replace Trane with Nest Step1. It is also important for the replacing thermostat to be compatible with the existing system. Replace trane xl624 thermostat with nest Help please 🥺 My husband started to replace the trane xl624 with a nest and pulled all the wiring off before taking a pic. We have a Trane Weathertron Xl1200 heating pump with the thermostat pictured below and are trying to replace it with our new Nest thermostat. Grrrrr Can anyone help with wiring please? Upvote # 2 12-06-21, 09:25 AM PJmax Group Moderator Join Date: Oct 2012. Replacing my Trane thermostat with a Nest thermostat ‹ 1 2 › S Sid 03 posted 1 year ago Trying to replace a Trane thermostat with a Nest thermostat and I have just had a long chat with Nest support. ), by application (Household, Commercial, etc. Nest Learning Thermostat for a Dual Fuel Heat Pump We just had a heat pump installed (Bosch BOVB 36HDN1 M18M) when we replaced our old furnace (new furnace is Trane TDD2B080A9V3VAB). Replace trane xl624 thermostat with nest Help please 🥺 My husband started to replace the trane xl624 with a nest and pulled all the wiring off before taking a pic. The thermostat will always read 70 degrees regardless of what the. ENERGY STAR certified smart thermostat for home that helps you save energy and stay comfortable. In some cases, it's possible that your system can be made Nest thermostat-compatible. With so many existing options, it would be important to choose a thermostat that is well-suited to the unique needs of the home. Remove Trane ComLink 2 Thermostat Install Nest. I am sorry about the “NASA” compatibility checker, the apple autocorrect changed NEST to NASA. We bought a Honeywell model rthl2510c thermostat to replace a GE weathertron thermostat connected to a trane ex1000 heat pump. the Google Store has a Nest compatibility checker. Replacing Trane thermostat. I have two trane z-wave tzemt400bb32maa thermostats in my house and want to replace both of them with Nest Learning Thermostat. Weathertron Xl1200 to Nest Thermostat. Noticed that the Trane has only 3 wires while the CT100 supports traditional wiring only (Y1,Y2,B,R etc). If you have a micro-controller based system, your Nest thermostat may need a C wire or Nest Power Connector to be compatible with these systems. Data,24vac power, 2 JameseFeldmann1 Community Member Options 05-29-2022 01:05 PM Can i replace Trane Thermostat with a Nest thermostat?? Labels: Android. It's odd to have 2 B connections and 2 O connections. Blue wire on a thermostat (source: Reddit) In this article, I'll explain the function of blue wires. Product note: You can also check your system’s compatibility before purchasing a Nest thermostat with our online Nest Compatibility Checker on the Google Nest support page. Here are the steps to take: Start with turning the power off at the house’s circuit breaker panel or fuse box. They insist my wiring is for a dual-fuel, and the NEST itself defaults to this thus requiring 'professional. Replace trane xl624 thermostat with nest. Contact a local HVAC professional and have them install a step down transformer to 20 - 30 V. Most wiring bundles will have most of the colors matching the letters. Replacing Trane XR401 thermostat with Nest Spent over two hours with NEST support, to no conclusion. I currently have a Trane Taystat 340, and I would like to upgrade it to a Nest 2nd generation, I currently have a total of 6 Wires in my wall. Hello, I have two trane z-wave tzemt400bb32maa thermostats in my house and want to replace both of them with Nest Learning Thermostat. I am also unsure as to what orientation I would need to use. Replace American Standard Thermostats with Nest on Trane AC ">Replace American Standard Thermostats with Nest on Trane AC. Replace Trane TCONT900AC43UA Thermostat with CT100">Replace Trane TCONT900AC43UA Thermostat with CT100. You can mount an Aria (made by Cuby) wall thermostat anywhere on the wall and it gives you wall control (not required, the Cuby G4 can do it all through the app). On a 4-wire thermostat, the blue wire can be connected to the Y terminal instead of the C terminal. Nest gives me different answers each time I call, but most recently they said to use the B orientation- is that correct? Thanks! Upvote # 2. Installing a 3rd generation Nest thermostat to replace Trane…. Nest Thermostat ">How HVAC Wiring Works. Google Nest Community Thermostats Re: Is it possible to to replace Trane XL624 therm Is it possible to to replace Trane XL624 thermostat with Nest Go to answer TexasNester Community Member Options 02-25-2023 09:51 AM It has the following wires: C, R, W1, W2, G, Y1, Aux NC. both systems are connected to a Honeywell thermostat via VisionPro Ipaq interface module. The app says it is not compatible but I'm not sure if that is due to the existing Trane unit having a X2 wire, which wasn't an option in the compatibility checker. Replace American Standard Thermostats with Nest on Trane AC/Heat Pumps and Furnaces I am hoping to replace two American Standard AccuLink Platinum 850 controllers with two Nest Thermostats. Replacing my Trane thermostat with a Nest thermostat ‹ 1 2 › S Sid 03 posted 1 year ago Trying to replace a Trane thermostat with a Nest thermostat and I have just had a long chat with Nest support. I dont think so Answered in 1 minute by: HVAC Technician: airheatman airheatman, HVAC Technician Category: HVAC. Replacing TRANE Thermostat with a Nest Generation 3 Thermostat I have the 4 wires currently: TRANE White wire goes to D Red Wire goes to R Blue wire goes to B/C Thermostat Yellow wire--looks as if it's not hooked up. Nest installation for Trane XV95 and VisionPro Iaq EIM Current Set-up i have approx 10 yrs old Trane XV 95 Gas heating Furnace and Air conditioning system of a different brand. I went through a great internal debate when I recently replaced my Nest controlled single-stage system with a 2 stage gas furnace/variable. Best way to compare compatibility is to use the NASA compatibility checker. if Nest Thermostat is compatible with your ">How to check if Nest Thermostat is compatible with your. Google Nest thermostats are usually compatible with zoned systems that use multiple thermostats, including zoned systems with dampers. Remove the fuse or flip the circuit breaker for your HVAC system. On a 4-wire thermostat, the blue wire can be connected to the Y terminal instead of the C terminal. Nest thermostat on Trane furnace Moderator note: separated from the following thread: Thermostat C wire connection on Trane Hello: I am trying to replace a Trane thermostat with a Google Nest thermostat controlling a Trane S9V2 furnace and a Trane XR16 A/C unit. In combination with a Trane air conditioner, the two products work together to efficiently cool your home and take care of your home energy needs. Replacing my Trane thermostat with a Nest thermostat ‹ 1 2 › S Sid 03 posted 1 year ago Trying to replace a Trane thermostat with a Nest thermostat and I. Remove Trane ComLink 2 Thermostat with 3 wires D,R,B. The Nest Learning Thermostat is a simple, yet powerful programmable thermostat that's easy to use. We have electric heat with emergency backup. In some cases, it’s possible that your system can be made Nest thermostat-compatible. Replacing TRANE Thermostat with a Nest Generation 3. Tried to check the compatibility with the online compatibility checker but wasn't able to find exact matches between the wires in the thermostat vis-a-vis the checker. Even when one of the contractors QA guys. The contractor put in a new smart thermostat because 'some Nest models don't work well with heat pumps. Post a picture of the original thermostat's wiring here. Only the booklet does not have a good reference for the. Replace Trane TCONT900AC43UA Thermostat with CT100 Devices & Integrations ajaybarve (Ajay Barve) January 1, 2017, 10:41pm #1 Anyone have any experience with replacing a Trane TCONT900AC43UA thermostat which has only 3 wires with a C100. Your current thermostat is only fully compatible with the Nest Learning Thermostat, 3rd Gen. Remove Trane ComLink 2 Thermostat Install Nest. Here are the steps to take: Start with turning the power off at the house's circuit breaker panel or fuse box. 03-29-2023 07:50 AM I am trying to replace a TRANE tcont803as32daa heat pump thermostat with a Nest Thermostat (not Nest Learning). We have electric heat with emergency. This item: Google Nest Thermostat - Smart Thermostat for Home - Programmable Wifi Thermostat - Snow $12900 + Google Nest. You can replace your Trane thermostat, but you need to be careful. I currently have a Trane Taystat 340, and I would like to upgrade it to a Nest 2nd generation, I currently have a total of 6 Wires in my wall. Hello, I have two trane z-wave tzemt400bb32maa thermostats in my house and want to replace both of them with Nest Learning Thermostat. Nest Learning Thermostat for a Dual Fuel Heat Pump">Nest Learning Thermostat for a Dual Fuel Heat Pump. When selecting the type of thermostat, I want, it would be important to compare. to/3NIFJuONest 3rd Gen: https://amzn. Trying to replace a Trane thermostat with a Nest thermostat and I have just had a long chat with Nest support. Nest thermostats are compatible with many different types of heating systems, including boiler systems. You should look at the letter designations in your existing thermostat. A wrench-shaped icon will appear on the display. This report studies the Smart Thermostat market, covering market size for segment by type (Wired Thermostats, Wireless Thermostats, etc. com/ythiJustAnswer Customer: Can I replace my Trane Baystat 239 thermostat with a NEST Smart thermostat without impeding function. Hello, I have two trane z-wave tzemt400bb32maa thermostats in my house and want to replace both of them with Nest Learning Thermostat. However, if you're getting an all-new heating and air conditioning system from Trane, we highly recommend the ComfortLink. Use our online Compatibility checker to quickly check if your heating system can work with a Nest Learning Thermostat or Nest Thermostat E. Petrichor Nest Thermostat Wall Plate - Compatible with Google Nest Thermostat 2020 - Nest Thermostat Trim Kit, Nest Thermostat Wall Plate Cover Thermostat Accessory Easy Installation - Snow 4. Google Nest Community Thermostats Re: Is it possible to to replace Trane XL624 therm Is it possible to to replace Trane XL624 thermostat with Nest Go to answer TexasNester Community Member Options 02-25-2023 09:51 AM It has the following wires: C, R, W1, W2, G, Y1, Aux NC. Replacing TRANE Thermostat with a Nest Generation 3 Thermostat I have the 4 wires currently: TRANE wire goes to D Red Ask an Expert Home Improvement Questions HVAC Questions Replacing. Replace American Standard Thermostats with Nest …. Match the wire colors to the terminal letters. The Nest wants more wires!. I am trying to replace my trane weathertron thermostat with the nest. Replace Trane TCONT900AC43UA Thermostat (Trane XL900). It should be. If you can live without the emergency heat function, you can just tape the black wire off and you can then use the Google Nest Thermostat. Replacing Trane XR401 thermostat with Nest Spent over two hours with NEST support, to no conclusion. It was time for me to replace my thermostat so I filmed the whole process of me installing a new Nest. The X terminal is for emergency heat which only the Learning thermostat supports. The wire connects the thermostat to the low-voltage heating system. When selecting the type of thermostat, I want, it would be important. You will need to download the Google Home or Nest app to check for Compatibility. If you have a micro-controller based system, your Nest thermostat may need a C wire or Nest Power Connector to be compatible with these systems. How to replace an HVAC thermostat and install a Nest thermostat. See more Reply Save Like T tool man Taylor. Use our online Compatibility checker to quickly check if your heating system can work. Contractor's Assistant: Did you double-check the thermostat's settings? And what about the filters? I checked thermostat setup. Replacing TRANE Thermostat with a Nest Generation 3 Thermostat I have the 4 wires currently: TRANE wire goes to D Red Ask an Expert Home Improvement Questions HVAC Questions Replacing TRANE Thermostat with a Nest Generation 3 Related HVAC Questions Journeyman Service Techni State Licensed Mechanical. Ask an installer if you need help identifying your system. The current thermostat has wires at the G,W,Y & RC (with RC jumpered to R). They are controlling two Trane Platinum 18 Variable Stage AC/Heat Pumps and two Trane XC 80 two-stage gas furnaces. Chapter 3 Smart Thermostat Market Segment Analysis by Type 3. Tried to check the compatibility with the online compatibility checker but wasn't able to find exact matches between the wires in the thermostat vis-a-vis the checke. Can I replace my Trane Baystat 239 thermostat with a NEST Smart. Installing a 3rd generation Nest thermostat to replace Trane BAYSTAT240. I am hoping to replace two American Standard AccuLink Platinum 850 controllers with two Nest Thermostats. How to Replace Trane Thermostat with Nest. Remove the security screw at the bottom of the existing thermostat by turning it counterclockwise with the screwdriver. Nest Learning Thermostat for a Dual Fuel Heat Pump : r/Nest. This report studies the Smart Thermostat market, covering market size for segment by type (Wired Thermostats, Wireless Thermostats, etc. Remove Trane ComLink 2 Thermostat with 3 wires D,R,B. Thermostat Market Size with Top Companies 2023 ">Smart Thermostat Market Size with Top Companies 2023. The Trane system has two extra wires (brown and black) that are connected to an outdoor temp sensor. Your wires in use appear to be R With a jumper to RC, Y, O, G, W1, W2 and C. They work with all common fuel types including natural gas, oil, and. Replacing my Trane thermostat with a Nest thermostat. If you just want to replace your current thermostat, the Nest will serve you well. Huggins, you Trane is a standard HVAC control system and the Nest Learning Thermostat is fully compatible with your system. OK it looks like you might have a heat pump base system with auxiliary heating. com/ythiJustAnswer Customer: Can I replace my Trane Baystat 239 thermostat with a NEST Smart thermostat without impeding function. the new NEST requires wiring to : Y1 - Y2 - G - OB - RC - W1 - W2 AUX - C - * - RH BUT MY OLD TRA … read more. You need to talk to an expert on your HVAC equipment. Tried to check the compatibility with the online compatibility checker but wasn't able to find exact matches between the wires in the thermostat vis-a-vis the checke. ; A local pro installer will also be able to tell if your system is Nest compatible (and rewire it to be Nest compatible, if needed). Steps to replace Trane with Nest Step1. I was using a 3rd (current) generation Nest thermostat with my old (2002 Trane) A/C, but the guy who put together the new system on paper said that (in short) because of the complexity of the system, I should use Trane's XL824 thermostat. You can replace your Trane thermostat, but you need to be careful. Can I replace my Trane Baystat 239 thermostat with a NEST. You may need a Pro to advise you on this one. It was time for me to replace my thermostat so I filmed the whole process of me installing a new Nest thermostat and. Huggins, you Trane is a standard HVAC control system and the Nest Learning Thermostat is fully compatible with your system. The Trane system has two extra wires (brown and black) that are connected to an outdoor temp sensor. 1 Global Smart Thermostat Market by Type 3. If not, unscrew the thermostat and pull it gently away from the wall. We just had a heat pump installed (Bosch BOVB 36HDN1 M18M) when we replaced our old furnace (new furnace is Trane TDD2B080A9V3VAB). Data,24vac power, 2 JameseFeldmann1 Community Member Options 05-29-2022 01:05 PM Can i replace Trane Thermostat with a Nest thermostat?? Labels: Android Nest Learning Thermostat. There are a lot of reasons to change out your thermostat. Replacing Trane XR401 thermostat with Nest. How to check smart thermostat compatibility in your home. Google Nest thermostats are designed to work with most 24V systems, even older systems. I"m trying to install a Nest thermostat 3rd generation on my Trane heat pump/gas furnace system. TRANE THERMOESTAE TO NEST NEW 3RD. Alternatively, you can also make use of the Compatibility Checker. Replacing a Trane Thermostat with a Honeywell Thermostat I am replacing an existing Trane BAY28X138 mercury thermostat on a heat pump system with a Honeywell RTH6360D and need some help making sure that I connect it properly. Two of the most common thermostats we install for our clients are the Nest Learning Thermostat and. A local pro installer will also be able to tell if your system is Nest compatible (and rewire it to be. Their function is to link the thermostat to the HVAC system control panel. Installing Nest on Trane system. Petrichor Nest Thermostat Wall Plate - Compatible with Google Nest Thermostat 2020 - Nest Thermostat Trim Kit, Nest Thermostat Wall Plate Cover. Our old system has a variable speed air handler and we want to make sure that we hooked up the wiring correctly. ; A local pro installer will also be able to tell if your system is Nest compatible (and rewire it to be Nest. Replace Trane TCONT900AC43UA Thermostat (Trane XL900) I would like to replace my Trane XL900 thermostat with a smart thermostat (CT100 which is a Zwave enabled Thermostat) so that I can incorporrate it in my home automation. TRANE brand HVAC wire connection to Nest Thermostat. The contractor put in a new smart thermostat because 'some Nest models don't work well with heat pumps. The Nest Learning Thermostat is a simple, yet powerful programmable thermostat that's easy to use. Replacing Trane XR401 thermostat with Nest Spent over two hours with NEST support, to no conclusion. 235 134K views 2 years ago Google Nest thermostats are designed to work with most 24V systems, even older systems. Trane thermostats are designed to provide optimal heating and cooling solutions that offer you control over the HVAC system. Replace American Standard Thermostats with Nest on Trane AC/Heat Pumps and Furnaces I am hoping to replace two American Standard AccuLink Platinum 850 controllers with two Nest Thermostats. I am looking for a replacement for a CM260 thermostat with separate O and B wires for use with a EWC-ST-2E Ultra-Zone. Hello: I am trying to replace a Trane thermostat with a Google Nest thermostat controlling a Trane S9V2 furnace and a Trane XR16 A/C unit. Nest Learning Thermostat for a Dual Fuel Heat Pump We just had a heat pump installed (Bosch BOVB 36HDN1 M18M) when we replaced our old furnace (new furnace is Trane TDD2B080A9V3VAB). Huggins, you Trane is a standard HVAC control system and the Nest Learning Thermostat is fully compatible with your system. Nest Learning Thermostat vs. Blue wire on a thermostat (source: Reddit) In this article, I’ll explain the function of blue wires. The corresponding wires go to the G,W2,Y2 & R at the furnace. Post a picture of the original thermostat's wiring here. Hello: I am trying to replace a Trane thermostat with a Google Nest thermostat controlling a Trane S9V2 furnace and a Trane XR16 A/C unit. Replacing my Trane thermostat with a Nest thermostat ‹ 1 2 › S Sid 03 posted 1 year ago Trying to replace a Trane thermostat with a Nest thermostat and I have just had a long chat with Nest support. You’ll need to check your current thermostat’s wires to tell if your system is Nest thermostat compatible, and which thermostat models it will work with. The current thermostat has wires at the G,W,Y & RC (with RC jumpered to R). EDIT: The B wire in the Trane thermostat pic may not be connected through to the air handler/heatpump. Replace American Standard Thermostats with Nest on Trane AC/Heat Pumps and Furnaces I am hoping to replace two American Standard AccuLink Platinum 850 controllers with two Nest Thermostats. In combination with a Trane air conditioner, the two products work together. Put aside the security screw at the bottom of your current thermostat. They insist my wiring is for a dual-fuel, and the NEST itself defaults to this thus requiring 'professional installation' on the device itself. Initial wiring I tried brought warm air instead of cool. I dont have a nest yet, I have a trane weathertron and want to replace it with the nest Contractor's Assistant: Is there anything else the HVAC Tech should know before I connect you? Rest assured that they'll be able to help you.