If you are changing the location of the thermostat or installing one in new construction, choose the location carefully. It should be on an interior wall, since exterior walls can be cool in winter and warm in summer. This will lead to incorrect readings, your HVAC system working too hard, wasted energy and your home being too warm in winter and too cool in summer. The best thermostat location is on an interior wall near the middle of your home that isn’t affected by: From the furnace location, gently pull the wiring bundle toward the furnace. Having a second person feeding wire from the spool or coil into the wall will help prevent snags. An important note: Keep in mind that dealing with electrical circuits can be harmful to yourself. That’s why always follow the appropriate safety measures when working on live electrical circuits. For more information about the wires and their ampacity, consult the AWG gauge chart with wire sizes for specific amps here.

But fear not– we give you alternate wiring options for those systems. They are found below 2 Wire Thermostat WiringYou’ll be irritated when entering the cold room coming from your work after a tiring day in extreme weather. Thus, Wi-Fi compatibility or Remote Access capability of the 2-wire thermostats can save you— you can turn the heating system ON/OFF even from a remote location. However, not all two-wire thermostats are programmable and can be controlled remotely, but some are manual. Choose what fits your needs!

Green wire is for the fan. Mini-splits have an indoor air handler with a fan; the power input that goes into the fan is regulated by the green or “G” wire. Yellow Thermostat Wire (“Y1” And “Y2” Wire) Detach wires and connect them to the same terminal on the new thermostat one at a time. Wire 1: Detach from the old, attach to the new. Wire 2: Detach/attach. Take off the motherboard and secure the wires; if you don’t hold them, the four wires will get lost in the wall. The thermostat holds the wires out of the wall; the wires are suspended on the thermostat. If you remove the thermostat right away, the wires will be lost inside the wall. You will have to either:

Spreading them apart will create at least a 2×2 inch crosssection, and the wires will be suspending on the wall (instead of on the thermostat). Don’t try to note where each wire goes here; simply take a picture of the wires to save yourself from an avoidable headache. Thermostat wiring color code is not absolute because some brands tend to deviate from the industry standards. Below, we’ll help you understand thermostat wiring by brand: Honeywell This 4 wire thermostat wiring is for simple, single stage heat pumps. See 5-wire and other options for more complex heat pump systems. 5 Wire Thermostat Wiring

Overlap at least 4” of the old wiring with new wiring, and wrap electrical tape tightly around the overlap. W wires go directly to the source of heating; that may be a furnace (gas, electric, oil, you name it) or heat pumps ( mini-split heat pumps included). Unlike the versatile C-wire thermostats, the two-wire thermostats can’t deal with HVAC systems with cooling options and multistage systems. Moreover, there are fewer options for compatibility with the two-wire thermostats as not all heating systems can work with these devices. Furthermore, the cooling systems such as air conditioners and fans cannot be controlled without employing additional two wires. To reconnect the wire, simply put the wire on the right terminal and tighten down the set screw. Pull a wire a bit to make sure the wire is properly fixed.If you have a communicating HVAC system, then you’ll need a communicating thermostat and proper wiring. Details are available in our Communicating vs. Non-Communicating HVAC guide. Communicating systems use only 4 wires. However, the basic wiring principle is the same: Each wire must connect to the furnace or air handler terminal and the corresponding thermostat terminal. How to Replace Thermostat Wire Attach the wires to the terminals on the furnace using the color code and diagram provided with the thermostat and/or the furnace or air handler. The thermostat comes with lots of energy-saving modes which will save you a lot of money on your electricity bill. The most important thing to remember is that the temperature settings should be changed at least once every 7 days to make sure the thermostat is functioning properly. O” or the orange thermostat wire is for reverse valve cooling. Most bigger heat pump manufacturers like Trane, Goodman, Lennox, and so on have the orange wire that goes to the condenser (located in the outdoor unit of heat pumps).

Use the wiring diagram and code to attach the wires to the terminals on the thermostat that correspond to the connections on the furnace or air handler. Some thermostat models require connectors to be installed on the wires first. A thermostat is a device which allows you to control the temperature of your home through a user-friendly interface. It measures room temperature and then it balances the work of heating and cooling equipment until the temperature reaches desired values, and when they’re reached it turns it off. There are many kinds of thermostats, but most basic ones are 2-wire thermostats. Obviously, there are many different kinds of thermostats out there. 100% of guidelines will not work for 100% of thermostats. There are, after all, many different types of thermostats with different wiring out there: Honeywell thermostat wiring, nest wiring, old thermostats, and so on.Alternate options:If you don’t have Aux heat or an accessory light or a powered air cleaner but the system’s reversing valve needs to be energized, then here are steps 6 and 7. After carefully testing multiple two-wire thermostats, we have found Honeywell Home RTH9600 WF thermostats to be the most suitable choice for the ones looking for a solution for heating the room at the desired temperature, warm, not too cold. Its compatibility with voice commands, customizable screen color, and many more features make it to the top of the list. You’re probably wondering what the “O” and “B” represent. “O” represents an orange wire that works for reverse valve (Rv) cooling. The “B”, on the other hand, represents a dark blue wire that works for reverse valve (RV) heating. Yellow wire