To fix or replace a faulty thermostat, the right professional depends on where your thermostat is located:
HVAC repair pros are a good option if you're looking for someone to replace a thermostat. In fact, you may find that many thermostat installers work with an HVAC company. Plus, by hiring an HVAC expert to replace your thermostat, you can also book an HVAC inspection at the same time.
Basic repairs on a thermostat—such as replacing batteries, cleaning contacts, or securing loose wiring—generally cost between $200 and $300, according to industry estimates.
One of the most common causes of thermostat failure is also the easiest to fix. Batteries are not permanent and need to be regularly changed. If your thermostat is unresponsive, change the batteries and reset the system. This often resolves the problem right away.
Yes, a thermostat can often be repaired. However, most modern HVAC and automotive thermostats are sealed electronic units or mechanical assemblies that are usually replaced rather than repaired when a component breaks.
Average Lifespan of a Thermostat
With a straightforward design and basic scheduling features, they are reliable workhorses that can last 10 to 15 years with proper care. Routine programming updates and occasional recalibrations go a long way toward keeping them accurate and extending their usefulness.
Some thermostat problems need immediate attention to prevent damage to your heating and cooling system or to restore comfort in your home. Issues like power failures, wiring problems, and system cycling errors can lead to emergency situations that demand quick action.
A failing thermostat usually shows clear signs: the HVAC or engine behaves erratically, the screen is blank, or the temperature in your home/car does not match the settings.
Disconnect the old thermostat and unscrew the mounting plate. Check the new thermostat instructions for compatibility and wiring guidance. Connect the labeled wires to the new thermostat. Attach the new mounting plate to the wall.
Thermostat Replacement starts at $99. To ensure the best service possible, we provide a complimentary 10-point system inspection. This includes: Installation and calibration of your new thermostat.
If you're unsure, or uncomfortable with electrical work, it's always a good idea to consult a professional electrician to ensure the installation is done correctly. If you don't have a C-wire installed, we recommend hiring a professional to install a smart thermostat.
No, thermostats are not universal. While many modern residential systems use standard 24-volt, low-voltage wiring, thermostat compatibility depends on voltage (110V/240V vs. 24V), system type (heat pump vs. furnace), and staging (single-stage vs. multi-stage). Using the wrong type can cause serious damage to your HVAC equipment.
Who to call if the thermostat is not working. If your thermostat isn't working and your house is getting cold or unbearably hot because the HVAC system isn't running, you need to call an HVAC professional.
Handyman can do it! Call CLS Mechanical, Inc. Thank you for all the great suggestions. I found someone to help us out!
To quickly fix a broken thermostat, first verify the device has power by replacing the batteries and resetting the circuit breaker. Next, turn off the power, remove the cover, and tighten any loose wires. Clean away dust, or replace the entire unit if the issue persists.
Thermostats typically fail due to age, mechanical wear and tear, and environmental contamination. Whether you are referring to a car's cooling system or a home HVAC unit, the root causes generally fall into a few specific categories.
Most home thermostats last between 10 to 15 years. However, this lifespan varies significantly by the type of unit you have.
Expect to pay or charge between $150 and $450 in total for a standard thermostat replacement. This generally breaks down into $50 to $150 for the physical unit, plus $100 to $300 for a professional electrician or HVAC technician to install it.
A plumber isn't usually needed for thermostat replacement unless your thermostat directly controls a water-based heating system, such as underfloor heating or a boiler with complex plumbing connections. Even then, an electrician is typically the right professional to handle the wiring.
To reset a thermostat, perform a simple reboot by turning the unit off, removing the faceplate, and taking out the batteries for about 30 to 60 seconds. Alternatively, power cycle the HVAC system at your circuit breaker for a few minutes.
To test your home thermostat, perform a simple system check: set the temperature a few degrees above (for heat) or below (for cool) the room temperature. Listen for a "click" and wait to see if your HVAC system turns on. If nothing happens, you can troubleshoot the device yourself.
If your thermostat isn’t working, start by checking the batteries, as dead batteries are the most common cause of a blank screen or unresponsive system. Pull the faceplate off the wall and replace the AA or AAA batteries inside. If your screen is blank and it isn't battery-operated, proceed with the troubleshooting steps below.
Emer stands for Emergency Heat. It is a manual setting on heat pump systems that shuts off your outdoor compressor and relies entirely on your home's backup heating source (usually electric heat strips or a gas furnace).
When a thermostat fails, its behavior depends on whether it gets stuck open or closed. It typically affects engine performance, fuel economy, and cabin heating.