As you are choosing the best product for your application, you will notice that we talk a lot about line voltage temperature differential, or hysteresis, with our thermostats. So, what is temperature differential? When a switch changes states from Open to Closed. The difference between those two points is the differential, or hysteresis. Here’s an example for line voltage thermostat differential…

A line voltage thermostat kicks your fan on once air temperature rises to 70°F (contacts close), and once the air temperature falls to 65°F the fan turns off (contacts open). Given this example, the differential of the line voltage thermostat is 5°F. Different thermostats can have different options for temperature differentials, so it’s good to evaluate what the thermostat is capable of to ensure that it will work for you and your application. If not, it could fail to keep your application at the right temperature, or fail overall.

Line Voltage Thermostat Differential


Line Voltage Temperature Differential

Our K-Kontrol line voltage thermostats are available with a fixed temperature differential of 2°F.

Our Tempro brand of line voltage thermostats offer an adjustable differential up to 12°F.

Additionally, our electronic temperature controller offers an adjustable differential up to 30°F.

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Original equipment manufacturers & agricultural communities worldwide use temperature controls designed & manufactured by K-Kontrols. Our temperature controls are great for barns, greenhouses, livestock buildings, garages, vacation homes, construction sites & more.

Custom Options

Variety of custom options available such as temperature ranges, sensing element lengths & private branding.


K-Kontrols meet NEMA 4X, UL, cUL & NEC 457 Ag-ratings.

High Quality

We take pride in quality control & reliable operation of our components. Every switch is individually tested before it leaves the plant.

Made in the U.S.A.

Products are designed, manufactured, tested & shipped from our facilities in Eau Claire, WI to clients across the globe.