How Mechanical Knob Thermostats Differ From Smart Programmable Controllers

How Do Mechanical Thermostats Work?

The temperature sensor in a mechanical thermostat (also known as bi-metal) is made up of two pieces of metal that are laminated together. Each type of metal has a different rate of expansion when heated or cooled, which is what controls the thermostat temperature. 

Note: Mechanical thermostats operate within a temperature range and you are not setting an actual temperature.

The thermostat manufacturer calibrates the thermostats in the test lab, so the numbers on the thermostat closely match the actual temperature of the room. This means the temperature in your room will stay around your set point, but can be about five degrees above or below it at any given time.

How Do Electronic Thermostats Work?

Electronic thermostats have digital sensors to read the room temperature. They're much more accurate and responsive than mechanical thermostats, which means your room should stay within 1 degree of the temperature you set on the thermostat. 

Note: In addition to increasing comfort, the smaller temperature swings of electronic thermostats can translate to energy savings. 

How To Know Which Thermostat To Choose?

Even though mechanical thermostats aren't as responsive as electronic thermostats, our Vice President of Engineering says that some people want to use a thermostat like an on and off switch. In this case, mechanical thermostats are an excellent choice because they are more affordable than their electronic counterparts.

Note: Electronic thermostats aren't designed to withstand a certain amount of power or inconsistency. Power surges or "noise" on a power line could potentially fry their electronic components. 

If you're still on the fence about choosing either a mechanical or electrical thermostat, check out our blog on controlling a thermostat to know which option is best suited for you.