Who Should I Call to Replace a Thermostat?

This article was created using automation technology and thoroughly fact-checked and edited by HomeAdvisor Editor Ryan Noonan.

If you are deciding who to call to replace a thermostat, hire a thermostat installer first, with HVAC repair pros and electricians as strong options. Many warranties require licensed work on thermostats and HVAC components.

Incorrect installation risks HVAC short-cycling, nonstop running, or failure to start and can void warranties. A pro confirms whether a C‑wire exists or installs one for smart thermostats, completes the job in about 30 minutes to one hour, and helps with programming.

Benefits of Hiring a Thermostat Installer for Thermostat Replacement

Hiring a local thermostat installer is the safest way to replace an old or malfunctioning unit. Because the thermostat controls the entire HVAC system, bad wiring or placement can cause performance issues and increased wear and tear. Warranties for HVAC systems and thermostats often require licensed work. Installers also check for issues, verify C‑wire needs, and help program your new device for comfort and energy savings.

• Correctly replaces manual, digital, and smart thermostats

• Prevents short-cycling, nonstop running, and no-start issues

• Preserves HVAC and thermostat warranties with licensed work

• Confirms C‑wire presence and installs one if needed

• Understands thermostat wiring that isn’t color-coded

• Completes installation in 30 to 60 minutes

• Checks the system after installation for problems

• Helps program settings for comfort and efficiency

If you’re unsure about wiring or want to ensure your warranty remains valid, you might want to consider a thermostat replacement pro near you to ensure the job is done safely and correctly.

Can I Hire an HVAC Repair Pro for Thermostat Replacement?

An HVAC repair pro is an excellent choice for thermostat replacement. Many thermostat installers work within HVAC companies, so you can pair the job with a full system inspection and tune-ups. An electrician is also a safe pick for wiring tasks and adding a C‑wire, especially for smart thermostat upgrades. Handypeople may handle simple swaps, but complex wiring or relocating the thermostat calls for an installer, electrician, or HVAC expert.

How Do Pros Replace a Thermostat?

A thermostat installer follows a clear, safety-first process to ensure reliable operation and protect your HVAC system. The pro powers down equipment, evaluates wiring, and adds a C‑wire if needed for smart models. The new thermostat is mounted level in the same position, then wired, powered, and tested. Finally, the pro helps you set schedules and energy-saving programs.

1. Turn off power to thermostat and HVAC system

2. Remove the existing thermostat face panel

3. Check the circuit board for a C‑wire

4. If no C‑wire and installing smart thermostat, install a new C‑wire

5. Disconnect existing wires and remove old baseplate

6. Install the new thermostat baseplate, level and aligned

7. Reconnect wires and attach the front panel

8. Restore power and test the system

9. Program thermostat for comfort and energy savings

How Much Does It Cost to Replace a Thermostat?

Hiring a professional to install a new thermostat costs between $65 and $500, depending on the type of thermostat and number of thermostats needed. Difficult access or large properties can increase the price. The professional’s experience and location also factor into costs. Always request a detailed estimate that includes labor and materials to avoid unexpected expenses.