How to Install or Replace a Room Thermostat 12 steps & 15 minutes to install a new thermostat. THERMOSTAT INSTALLATION STEPS - CONTENTS: how to remove the old and. The familiar round thermostat is a manual model. On the upper left, there may be a "System" switch, which allows you to set the thermostat on Heat, Cool or Off. When it comes to smart thermostats, there’s a handful to choose from, but the big three that stand out are the Nest, Ecobee4, and Honeywell Lyric Round. We’ve. How to Install or Replace a Room Thermostat,Inspect. APedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website. How to install a heating or cooling room thermostat quickly and successfully: this article describes 1. We show how simple it is to replace a wall thermostat. We add a few warnings that can help avoid trouble along the way to an easy 1. All you need is your new wall thermostat, a medium or small flat head ro phillips screwdriver, and perhaps the patience to read the instructions from the thermostat manufacturer. We also include toll- free numbers that allow you to call the thermostat manufacturer's hot line in case you have a question or a difficulty. ![]() Green links show where you are. Copyright 2. 01. 7 Inspect. Apedia. com, All Rights Reserved. Step by Step Photo Guide to Removing the Old and Installing the New Room Thermostat. Before Buying Your New Thermostat be sure you need one. First are you sure you actually need a new thermostat? If you are buying a new unit because the old thermostat is "not working" be sure you have checked a few things: If the existing thermostat is an electronic model and its display is blank, is there power to the heating system it controls? Is there power to its transformer? Does the unit need batteries? It would be a shame to buy a new unit only to realize all you needed to fix the old thermostat was a couple of AA or AAA batteries. See HEAT WON'T TURN ONor if needed see LOW VOLTAGE TRANSFORMER TEST. Is the thermostat turned on and in the proper HEAT or COOL position? See FAN ON AUTO MAN Thermostat Switch. You'll also want to double check that the problem is with the thermostat itself and not its wiring. It's usually trivially easy to check most of these problems at once by disconnecting the thermostat wires at the heating system and then jumping the two terminals (or something equivalent). If the heat runs then the problem is indeed in the thermostat, its wiring, or its transformer. Over at our lead article on this topic THERMOSTAT WIRE CONNECTIONS we describe problems with broken thermostat wires, shorted wires, or blown fuses. Also see LOW VOLTAGE TRANSFORMER TEST. Ok so forget all that, we're ready to plow ahead. How to Choose & Buy your New Thermostat. You may have already purchased the replacement thermostat you want. If not, the number of choices is both small (in some big box stores) or huge (more than 2. Grainger. com). You might also want tosee Where to Buy a Room Thermostat. Watch out: Most new low voltage thermostats can operate almost any kind of heating and cooling system, but here are some things to watch out for: Some thermostats are for "heating only" systems. A low voltage thermostat would be the wrong type if you are controlling electric baseboard heat. If your thermostat needs to control both heating and cooling be sure that the product you buy can do so. If your system uses a heat pump, note that some thermostats will indicate on the package that they are not intended for that use. If you want to take advantage of automatic thermostat set- back programming (a feature that can make substantial reduction in home heating costs) you'll want a programmable thermostat. Take a look at the programmable features to convince yourself that the thermostat is sophisticated enough to do what you want (do you want a custom program for every day or just for weekends?) but not so fancy that you or your husband will simply give up before trying to program the thermostat's schedule. For my mom, who can't handle the buttons on her telephone, I'd buy a thermostat like the traditional, exquisitely simple round dial type unit shown at above- left. For myself, I'd buy my favorite. The Honeywell RTH2. RTH2. 21 series room thermostat shown above in this article. Here is a copy of the Honeywell RTH2. RTH2. 21 Series Programmable THERMOSTAT OWNERS MANUAL [PDF]For someone I didn't like very much I would buy the Honeywell CT2. At THERMOSTATS, HEATING / COOLING we describe different types of room thermostats, including both very simple models and more sophisticated programmable room thermostats. Technical Details about Thermostat Features. At HEAT ANTICIPATOR Adjustment we describe choices among thermostats that have a heat anticipator and those that don't, and we explain the situations for which you might want a thermostat that has this feature (such as if your heating system tends to overshoot or make the room hotter than the thermostat setting). Usually you can skip worrying about this. But if you know you want this feature. WHERE TO BUY a Room Thermostat with a HEAT ANTICIPATOR. That same article explains why you would or would not care about heat anticipators. At THERMOSTAT CYCLE RATE SWITCH you'll see a summary of some hidden or internal switches that are found in most replacement thermostats and that adapt the thermostat to a variety of uses including the control of fans and heat pumps or backup heat for heat pumps. OK so you've already got your new thermostat. We've already spent about as much time reading the above as it should take to remove the old and install tine new room thermostat. Remove the Old Room Thermostat. Below we've simply popped off the thermostat face. Here are the steps to follow when replacing a thermostat: 1. Turn off power: At above left, here's the old thermostat that we're going to replace. You can see by the fact that the display contains numbers that I have not yet turned off electrical power. If I short wires together maybe nothing will happen, but there's a chance I'll damage other heating system components or possibly blow the transformer (blue arrow in our photo). So we turn off power before going any further. Watch out: Turn off electrical power to the heating or cooling system before messing with thermostat wires. If you need help see ELECTRICAL POWER SWITCH FOR HEAT. Pull off the thermostat assembly. You can see the neat job I did in wiring the old unit to be removed - at above right.,3. Take note of the wires that are connected in the old thermostat: note the wire colors and the identify of the terminals to which each is connected. Watch out: because heaven knows what fools may have messed with thermostat wiring before, do not assume anything. Indeed in this case we can see that just two wires are being used: a red wire and a white wire. But also check to confirm that on the old thermostat the red wire was connected to the R terminal and the white ware was connected to the W terminal. But you might find something else. Disconnect the old wires and label them if necessary. Honeywell and just about any other thermostat manufacturer will give you a set of stick- on labels that you should use to indicate not the actual color of the wire but the ID of the thermostat terminal to which the wire was connected on the old thermostat. Since I had just two wires, red and white, and because the red was connected to R and the white to W on the old thermostat, I didn't use these labels. But if wire colors didn't match the terminal IDs or if I had multiple wires I would use the labels. Notice that I pulled the wires out and un- kinked them. Power was off so I didn't worry about taping bare wire ends. Position the new room thermostat mounting base in place & mark for drilling pilot holes for screws. You've already unpacked it - and read the installation instructions, right? I'm holding the thermostat base on the wall as close to level as I can get it. Notice those two orange lines I added to the photo? Those mark the screw openings for mounting the thermostat base. Notice that the left screw hole is oblong and horizontal in shape while the one at right is vertical - these openings will allow slight adjustment of the backing plate to perfectly level when I install the mounting screws. With older mercury bulb thermostats the unit would be out of calibration if not mounted level. With newer thermistor- type thermostats the unit will work properly if not perfectly level, but if it looks crooked on the wall it'll be annoying. Use a pencil to mark where you will need to drill pilot holes for the mounting screws. Drill pilot holes for the mounting screws. In drywall you might need to use the plastic anchors and sheet metal screws provided by the manufacturer in which case you'll select an appropriately sized drill bit. Don't make the hole too big or the anchor will turn or push right through the wall.
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