A car thermostat typically lasts 50,000 to 100,000 miles (or about 5 to 10 years). Because it isn't a strict routine maintenance item, it is often kept until it shows signs of failing, such as the engine running too hot or the cabin heater blowing cold air.
A standard HVAC thermostat should generally be replaced every 10 to 15 years. Smart or Wi-Fi thermostats may require replacement a bit sooner, around 5 to 8 years, due to wear-and-tear on their electronic components.
How can you tell if a thermostat is bad?
You likely need a thermostat replacement if your home temperature feels inconsistent, the display screen is unresponsive, or your heating and cooling system cycles on and off frequently. Upgrading is also recommended if you notice sudden spikes in energy bills without a change in usage.
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.
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.
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.
The best thermostat for most homes is the Ecobee Smart Thermostat Premium. It features built-in room sensors to manage hot or cold spots, integrates with all major voice assistants, and monitors indoor air quality.
It takes time for your home to warm up and cool down. If you're not sure how long it takes, try turning the heating on about 30 minutes before you need it. You should turn it off 30 minutes before you'll stop needing it.
Factors to consider when comparing different models include design, compatibility with your heating and cooling systems and C-wire (common wire) requirements. A C-wire is the wire that connects to your HVAC system to provide a smart thermostat with continuous power. C-wires are required on most smart thermostats.
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 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.
Yes, 72°F is a very comfortable temperature for your daytime heat setting. However, it is slightly higher than the recommended energy-saving guidelines, which could increase your heating bill.
Many homeowners are curious whether they need an electrician to replace a thermostat or if they can install a home thermostat on their own. While some try the DIY route, professional thermostat installation is usually the smarter, safer choice—especially with the range of high-tech models available today.
Unless your ac unit was 30 years old it should take less than 30 minutes. I'm a homeowner and a DIY'er and it took me about 30 minutes.
A thermostat typically lasts 10 to 15 years, though this varies by the model. Basic manual units can last up to 15–20+ years, while modern programmable and smart thermostats usually need replacement closer to the 10-year mark due to software advancements and complex internal components.
Replacement of thermostat unit
Upgrading to a new thermostat (unit + installation) typically runs $140 to $350, depending on model and complexity. There is also a broader range—$80 to $440—with variations based on location and type of thermostat.
A new thermostat that works well usually means less work for your HVAC system. That means you'll need fewer repairs. It also means that you should get several years out of the system before it's time for a replacement. Upgrading to a new thermostat can help you save energy and ensure your HVAC system performs better.
To check if a new thermostat is compatible with your HVAC system, turn off the power to your system at the breaker, remove your current thermostat faceplate, and take a picture of the wiring. The letters beside the connected wires dictate your system's compatibility.
Heating and cooling (HVAC) systems are the biggest energy consumers in a typical house, accounting for roughly 45−50% of your total electricity usage. Water heaters, refrigerators, and lighting round out the rest of the major draws.
A detailed study from the National Renewable Energy Laboratory found residents preferred a wintertime heater setting between 67 °F and 70 °F (19 °C to 21 °C). The Department of Energy recommends a winter heat setting of 68 °F (20 °C), which matches up very well with the temperatures most of us are comfortable with.
For most customers, we recommend turning on your furnace when the weather is consistently below 18° Celsius, which usually happens to be around the end of September, or early October. Some homeowners try to put off turning on their furnace as long as they can to save money, which is okay if you're healthy adults.
The best thermostat brand depends on your smart home ecosystem and heating setup, but Ecobee, Google Nest, and Honeywell Home are the top choices. They offer features like geofencing, remote app control, and energy savings to help lower utility bills.
One of the most common thermostat-related problems that homeowners run into involves incorrect temperature readings. A thermostat that displays incorrect temperature readings can cause significant heating issues. There are several potential causes of an incorrect temperature reading, starting with improper placement.
Analogue Thermostat
These thermostats are ideal for those needing a very simple way to control the heating – such as for the elderly.