Appointment Lookup
213-596-2538
Learn how an air filter works in your HVAC system and how to choose the right filter.
How Do Smart Thermostats Work?: A Practical Guide
Smart HVAC thermostat connect to your smart phone or tablet through the WiFi signal in your home. Installing and connecting a smart thermostat enables you to monitor and control your HVAC system remotely. You can save money on energy bills and use less energy by installing a smart thermostat in your home.
KEY TAKEAWAYS
- A smart HVAC thermostat is a sophisticated type of control device that can allow you to remotely control your heating and cooling system from a smart phone or tablet.
- Multiple inputs and learning logic in a smart thermostat can help a smart thermostat control the climate inside your home efficiently to save energy and lower your energy bills.
- Smart thermostats are relatively simple to install on most HVAC systems so you can easily switch to this new technology when you find that this control system is right for your home.
How Electronic Thermostats Work
A smart thermostat is an enhanced version of an electronic thermostat.
Some homes still have a basic mechanical thermostat that simply has a dial or lever and a metal coil that senses temperature to cycle the unit.
Understanding the differences in how mechanical and electronic thermostats work will help you realize the advantages of upgrading your HVAC control system to a smart thermostat.
How Mechanical Thermostats Differ from Electronic Thermostats
One of the main differences between mechanical and electronic HVAC thermostats is the type of temperature sensor that they use.
A mechanical thermostat uses a bi-metal strip coiled up to detect temperature inside your home. Two different types of metal (copper and steel) are joined together and the thermostat physically moves a tab at the outer end of the coil to engage and disengage an electrical contact inside the thermostat to cycle the unit on and off and maintain the set temperature in your home.
An electronic thermostat uses a more accurate type of temperature sensor called a thermistor. A thermistor is an electrically conductive resistor. The electrical resistance of the thermistor changes proportionally with temperature. The control board in an electronic thermostat sends DC voltage through the thermistor and measures the voltage drop caused by the resistance to determine indoor temperature in your home. This method of sensing temperature is much more precise than the method that mechanical thermostats use. You can also position additional thermistors remotely in your home to provide an electronic thermostat more input about indoor temperatures throughout the house instead of just at the thermostat location.
Mechanical thermostats use a dial or lever to set desired temperature. The dial moves the sensor contact that turns on and off the HVAC unit so that the switch activates at the desired set temperature. When the bi-metal tab moves to the position that equates to the set temperature, the thermostat contact will engage the tab and turn on the unit. When indoor temperature rises above or below the set temperature, the bi-metal tab moves away from the contact and the thermostat shuts off the unit.
Although the mechanical thermostat is very reliable, it isn’t as efficient as an electronic thermostat. An electronic thermostat can use internal logic to run the circulation fan for longer after the contact shuts off the heat exchanger to use up every bit of cool or warm air in the system.
If your HVAC system still uses a mechanical thermostat, switching to an electronic thermostat will save energy and lower your heating and cooling costs.
Types of Electronic Thermostats
There are 3 types of electronic thermostats available for HVAC systems:
- Basic electronic thermostat: Uses a digital display that allows you manually set desired temperature.
- Programmable thermostat: Allows you to set up a daily schedule of automatic temperature setting changes.
- Smart thermostat: Connects to your smart phone or tablet so you can remotely control thermostat setting and includes learning features that help improve the efficiency of climate control in your home.
How a Smart Thermostat Works
A smart thermostat uses an electronic control board to connect to your home’s WiFi so you can monitor and control the settings remotely with your smart phone or tablet.
As an electronic thermostat, the smart thermostat uses a thermistor as discussed above to sense temperature. With many smart thermostats, you can add additional remote thermistor temperature sensors throughout your home to more precisely control indoor climate.
Smart thermostats use learning features and multiple inputs to more precisely control indoor climate and save energy.
- Many smart thermostats have humidistats that sense humidity in your home and adjust settings to keep you comfortable.
- They can also use outdoor temperature and conditions to help the thermostat operate your heating and cooling system efficiently.
- A smart thermostat can sense when you’re home or away and adjust settings accordingly to save energy by automatically adjusting temperature settings and run times.
- Smart thermostats can get input from your energy provider to run the system efficiently when electrical rates are lower and help put less strain on the electrical grid.
- Sophisticated learning features of smart thermostats allow the device to observe your temperature adjustments over time, gradually building an efficient adjustment schedule based on your preferences, so it can automatically adjust temperature settings throughout the day based on when you're typically home, away, or asleep.
- You can connect many smart thermostats to home automation hubs and controllers for easier and integrated control and efficiency.
Switching To a Smart Thermostat
Even if you have a mechanical thermostat, switching to a smart thermostat is relatively simple in most homes. You’ll need a smart phone or tablet and internet with WiFi to use the remote control features of a smart thermostat.
Wiring connections to connect a smart thermostat to your HVAC system are almost always compatible with your unit. The smart thermostat will have detailed instructions that allow you to install the thermostat yourself if you choose. You can also schedule HVAC service and we can send a Sears Home Services technician to your home to install a smart thermostat.
To get an idea of what’s involved when installing a smart thermostat, view this helpful video:
Understanding the advantages and features of smart thermostats will help you decide whether this device is right for your home. If you’re ready to switch to a smart thermostat, visit Sears.com to find the right one for your home.
Frequently Asked Questions
Why switch to a smart thermostat?
They learn your schedule, adjust temperatures automatically, and can be controlled via apps for convenience and energy savings. Sears Home Services handles installation and setup.
Do they work with all HVAC systems?
Most are compatible with standard systems; some require a C-wire. Sears Home Services can modify wiring if needed for correct power supply.
Will it really save on utility bills?
Yes, especially if you program setbacks during away hours. Sears Home Services can show real-world examples of customers reducing heating/cooling costs.
Does Sears Home Services install specific brands?
They’re familiar with major smart thermostat brands like Nest, Ecobee, and Honeywell. They’ll help you pick one that fits your home’s system and preferences.
Schedule your HVAC repair now!
Rely on our skilled technicians to diagnose and repair your HVAC equipment, ensuring optimal comfort in your home.
Chat
Loading scheduler options...
Repair HVAC Resources
Learn how a run capacitor works in appliances and HVAC systems.
Learn how inverter AC systems use a variable speed compressor to efficiently cool your home.
Wondering how evaporative coolers work to keep spaces cool and comfortable? Explore how they work and how to keep them working at their best.
Glossary Terms
The 608 Certification, mandated by the Environmental Protection Agency (EPA), is required for HVAC technicians to legally handle refrigerants. It ensures technicians understand refrigerant types, environmental impact, and proper handling techniques.
A compressor is a mechanical device that increases the pressure of a gas by reducing its volume, essential in various systems including refrigerators, air conditioners, and HVAC units for cooling and refrigeration processes.
A condenser is a component of HVAC and refrigeration systems, responsible for releasing absorbed heat from the refrigerant into the outside air or a water line, thus facilitating the cooling process.
A capacitor in an AC unit is an electrical component that stores and releases electrical energy to help start the motor and stabilize the voltage during operation.
Common Repair HVAC Symptoms
When your Payne central air conditioner won’t turn on or isn’t cooling, check for power problems, a failed capacitor, or a clogged condensate drain. This guide covers quick, safe troubleshooting steps and explains when to call Sears Home Services for expert central AC repair.
When your ICP central air conditioner won’t turn on or isn’t cooling, check for power problems, a failed capacitor, or a clogged condensate drain. This guide covers quick, safe troubleshooting steps and explains when to call Sears Home Services for expert central AC repair.
When your Heil central air conditioner won’t turn on or isn’t cooling, check for power problems, a failed capacitor, or a clogged condensate drain. This guide covers quick, safe troubleshooting steps and explains when to call Sears Home Services for expert central AC repair.
When your Carrier central air conditioner won’t turn on or isn’t cooling, check for power problems, a failed capacitor, or a clogged condensate drain. This guide covers quick, safe troubleshooting steps and explains when to call Sears Home Services for expert central AC repair.
When your Comfortmaker central air conditioner won’t turn on or isn’t cooling, check for power problems, a failed capacitor, or a clogged condensate drain. This guide covers quick, safe troubleshooting steps and explains when to call Sears Home Services for expert central AC repair.
When your Ruud central air conditioner won’t turn on or isn’t cooling, check for power problems, a failed capacitor, or a clogged condensate drain. This guide covers quick, safe troubleshooting steps and explains when to call Sears Home Services for expert central AC repair.