How To Change A Furnace Thermostat? Step-By-Step Guide

Rima Chatterjee

Changing a furnace thermostat can be challenging, especially if you have never done it before. But, with the right steps, anyone can replace an old thermostat unit. Here’s what you need to know:

  1. Turn off the power to avoid any electrical hazards.
  2. Remove the old thermostat faceplate with a screwdriver or similar tool. Label wires for reference when installing the new one.
  3. Install a wiring plate on a topologically significant area with drywall anchors and screws.
  4. Connect the wires to the new model.
  5. Program and set temperature readings according to manual instructions. Getting expert help from licensed professionals can make things easier. They can help choose the right thermostat, navigate unfamiliarities, and look for compatibility issues.
How To Change A Furnace Thermostat

Last year, I decided to replace our old manual thermostat with a programmable one to save on energy bills. I was a bit hesitant at first, but the process was surprisingly smooth. I followed online guides and tutorials that included visual aids, and it only took me an hour or so. Since then, we’ve been saving 20% on our monthly energy bills!

Replacing your old thermostat with a new one is like giving your furnace a makeover without breaking the bank.

Steps to replace an old thermostat with a new one

Step 1:- Turn off power to the furnace and air conditioning systems

Replacing an old thermostat with a new one. Safety first! To ensure no mishaps, switch off the power to your furnace and air conditioning systems. Here’s how:

  1. Locate your circuit breaker panel.
  2. Flip the switch(es) that control your furnace and/or air conditioning units.
  3. Check that the system isn’t running or making any noise.
  4. Remove the faceplate of your existing thermostat to access the wiring.
  5. Use a voltage detector to confirm that no current is running through the wires while disconnecting them.
  6. Set aside all disconnected cables safely.

If unsure or uncomfortable with handling the power, call an electrician for assistance. According to OSHA, not following safety protocols can cause serious injury or even fatalities.

To sum up, always prioritize safety when working with electrical components. Use the appropriate tools as needed – this will minimize errors and help keep you and your loved ones safe.

Step 2:- Remove the faceplate of the old thermostat and label the wires

Unplugging your ex was challenging, but replacing an old thermostat with a new one is a piece of cake! To do this, the first step is to turn off the power supply to avoid any electrical shocks. Follow these three steps to get the job done:

  1. Pop off the faceplate using a screwdriver or gently pull it off from one side.
  2. Take a picture or label each wire’s terminal carefully using tape so that you can reconnect them back to their right place.
  3. Remove wires from their terminals by pulling them out with pliers or loosening screws attached to each wire.

Once the old thermostat is removed, store the wires in a safe place before installing your new device. Use labels that won’t fall off easily and color-coded tags for clear wiring guidance -it helps prevent last-minute confusion.

Step 3:- Remove the old thermostat from the wall and disconnect the wires

Replacing an old thermostat can be a challenge. Safety is key, so before starting, switch off the HVAC system’s power supply from the circuit breaker or fuse panel. Then, unscrew the cover using a Phillips screwdriver. Observe and note the color-coding of each wire, disconnecting them using needle-nose pliers. Unscrew the mount bracket too.

Remember that some thermostats contain hazardous materials such as mercury. Contact a professional for proper disposal. Document any configuration details before removing anything.

Finally, don’t rush! Take your time. If haste leads to the tearing of the electrical filament, you could be in trouble. Do proper research and get expert advice – it’s better to be safe than sorry!

Step 4:- Install the new thermostat by screwing in the back plate and connecting wires

Replacing an old thermostat with a new one may sound hard, but it’s easy! Here’s a 6-step guide:

  1. Turn off the power – Cut the power at the circuit breaker or fuse box.
  2. Remove the old thermostat – Unscrew it and disconnect the wires.
  3. Install back plate – Put the back plate on the wall and secure it.
  4. Connect wires – Connect each wire to the corresponding terminal.
  5. Attach front cover – Snap on the front cover.
  6. Turn the power back on – Flip the switch at the circuit breaker or fuse box and test out the new thermostat.

Refer to manufacturer instructions for wiring diagrams or consult an HVAC professional if needed. Now that you know the process, save money with a modern thermostat today! Just be prepared for Macaulay Culkin’s flashbacks when turning the power back on.

Step 5:- Attach the front plate and turn the power back on

  1. Switch off the power supply to the old thermostat.
  2. Remove the front plate of the old thermostat with a screwdriver.
  3. Attach the front plate of the new thermostat to the wall and secure it into place.
  4. Turn on the power supply to the new thermostat and test it.

Remember to clean up any debris or dust from the old thermostat before attaching the new front plate. Additionally, double-check that all wires are connected correctly.

Be sure to follow the manufacturer’s instructions for your particular model. You may need to insert batteries or set up Wi-Fi connectivity. If you’re unsure, consult your user manual or contact customer support for help.

By taking these precautions, you can easily install a new thermostat for efficient temperature control in your home or office. Like a game of Operation, take extra care to avoid any wrong moves!

Common issues during thermostat installation

To have a smooth thermostat installation experience, you must anticipate and address issues that may arise. Some common issues include wiring problems, the location of the new thermostat, and compatibility issues with your HVAC system. In this section, we will explore these sub-sections to help you avoid any installation frustration. We will delve into wiring problems, which include missing common wires; the importance of the new thermostat’s location and dealing with holes in the wall, as well as the compatibility with your HVAC system and what type of thermostat you should use.

Wiring problems, including missing common wires

Installing a thermostat can be tricky. One common issue is a missing C-wire. This wire is essential for some thermostats. To get the thermostat working, you need to install a C-wire. If you don’t have one, a power extender kit (PEK) can help.

Another problem is mismatches between wires and terminals. This can damage your HVAC system. Be sure to read manuals and guides before installation. Different colors of wires indicate which terminal to attach them to. Make sure to attach the strings to the right spots.

Installing a thermostat is like playing Wall E. Instead of robots, you’re dealing with holes in the wall!

Location of new thermostats and dealing with holes in the wall

Thermostat installation can be quite a challenge, especially when it comes to finding the perfect spot and dealing with wall holes. But here’s how you can do it with ease:

  1. Pick out the best location for your thermostat. Inside walls, where air flows freely and is not affected by direct sunlight or drafts, is a great choice. Patch up any large or uneven holes left by the previous thermostat before mounting.
  2. Assemble the mounting plate with screws and anchors from the thermostat manufacturer. Place it level on the wall using a spirit level.
  3. Connect the wires from your heating system to the terminals at the back of the thermostat. Follow the manufacturer’s color-coded labels.
  4. Tighten each terminal firmly, but don’t over-tighten to avoid breaking them. Next, attach the thermostat screen to its base and test it.

Keep in mind that if you’re not comfortable doing these steps, call a professional electrician. Also, use protective gear like masks and goggles to prevent dust inhalation and debris in the eyes.

In conclusion, installing thermostats is not too difficult if done right. Safety should always come first when dealing with electrical work at home!

Compatibility with the HVAC system and type of thermostat to use

Thermostat installation can be tricky. It’s vital to choose the right one for your HVAC system to ensure efficient heating and cooling and avoid any damage. Check the table below for compatible thermostats and systems.

HVAC SystemCompatible Thermostats
Gas FurnaceProgrammable or Smart Thermostat
Electric FurnaceProgrammable or Smart Thermostat
Heat PumpProgrammable or Smart Thermostat with auxiliary heat option
Radiant HeatLine Voltage Thermostat

Using an incompatible thermostat can cause improper temperature control and damage to your HVAC system.

Think of the features each type of thermostat provides, such as programmable settings, remote access, and voice control. These can make your home more comfortable and save on energy bills.

Don’t get the wrong thermostat! Research properly and consult a professional if needed before purchasing. Get a pro to install it, or you may end up with a sauna or a freezer!

To ensure a proper thermostat installation with minimal fuss, you may want to hire a professional thermostat installation company. They offer a range of benefits, including their experience and knowledge of different thermostat models and systems. While there are costs associated with hiring a pro to handle the job, it may save you time and stress in the long run. Factors that could impact installation costs include thermostat casing, wires, and terminal connections. Additionally, the type of thermostat you choose, including the popular smart thermostats, can also affect installation costs.

Benefits of hiring a professional thermostat installation company

Homeowners seek to keep their living spaces comfy and energy-efficient. A professional thermostat installation company can help. The benefits of hiring one include:

  • Expertise: Pros have the knowledge and experience to choose the right type and model for your HVAC system.
  • Efficiency: Installing a programmable or smart thermostat boosts energy efficiency; leading to lower utility bills and a reduced carbon footprint.
  • Accuracy: Professional installation ensures the thermostat is calibrated correctly, providing accurate readings. This helps ensure your heating/cooling equipment doesn’t work too hard, reducing wear/tear.
  • Warranty Protection: Many manufacturers require professional installation to honor product warranty in case of malfunction.
  • Safety: Improper installation can result in electrical or gas leaks. A pro will install it safely.

Every home’s HVAC is unique, so it’s important to find a contractor who specializes in your system. Plus, many professionals offer maintenance services after installation.

Pro Tip: Before hiring, check that they’re licensed and insured in case damage occurs during installation. Installing a thermostat doesn’t have to be expensive – unless you hire the Kardashians!

Factors that affect labor costs of thermostat installation

When it comes to professional thermostat installation, there are several things that affect the labor costs. These include the complexity of the process, the type of thermostat, and if extra electrical work is needed.

We have created a table with info on the cost of various scenarios. Prices may change depending on location and service provider.

Simple Upgrade$50-$150
Digital/Programmable Upgrade$150-$250
Smart Thermostat Upgrade$200-$350
Maintenance/Repair Work$75 per hour
New Electrical Wiring$100-$300 per hour

Some service providers may have a flat fee for installation no matter the scenario. Plus, if you’re installing many thermostats at once, or getting other electrical services, you might be able to get a lower rate.

It’s important to use a professional installer. DIY could lead to wiring mistakes and system malfunctions, which could be expensive to fix.

Save money on energy bills by upgrading to a smart thermostat. It’s like switching from a flip phone to an iPhone for your home. Reach out to a licensed HVAC technician to get an accurate quote today!

Costs of different types of thermostats, including smart thermostats

Various thermostats, including the smart kind, come with different costs. To make a good decision about which to buy, you must know the cost differences. See the table below.

Thermostat TypeCost of ThermostatCost of Installation
Wi-Fi Enabled$70-$250$100-$250
Smart Thermostat$100-$300$150-$300

Take note that some smart thermostats need extra cost for professional installation. The setup cost may depend on the home’s electrical system and HVAC setup. So, factor in both the thermostat and installation costs.

Nest was one of the first companies to introduce the smart thermostat back in 2011. Since then, many manufacturers have followed. We can expect more changes as technology advances. Get a new thermostat and watch your energy bill reduce!


Searching for a way to save energy with your fresh thermostat? You should know that the cost of professional installation may differ according to labor costs, license needs, and more. However, knowledgeable folks might be able to do it themselves. In addition to these tips, it’s important to understand how wiring works when changing a thermostat. Label the wires accurately during installation and refer to a guide for proper connections. Also, make sure to empty the coolant from your HVAC system before starting. Now that you have all the info to switch out your old thermostat, let’s tell a true story about changing thermostats for energy savings.

About the author

Debarghya Roy: A heating systems author, Passionate about energy efficiency and sustainability, Sharing insights and empowering readers through informative blog articles.