Need to control anything electrical based of temperature, this Ranco unit makes it easy.   Most commonly used to make a kegerator or fermentation chamber out of a refrigerator or freezer, but can also be used to control pumps, AC units and more.  Usually, these units are not wired making install fairly complicated but these are wired up and ready to be plugged into most things using standard US power.

The unit can do either heating or cooling depending on the application and that can be changed right on the digital interface.

Ranco base Model # ETC-111000-000. 

This controller has two sets of contacts the Normally Open contact is rated at:

115 Volts 208/240 Volts

Full-Load Amps 16 Amps 8 Amps
Locked Rotor Amps 96 Amps 48 Amps
Ressistive Amps 15 Amps 8 Amps
Horsepower 1 hp 1 hp
 

The Normally Closed contact is rated at:

115 Volts 208/240 Volts
Full-Load Amps 5.8 Amps 2.9 Amps
Locked Rotor Amps 34.8 Amps 17.4 Amps
Ressistive Amps 5.8 Amps 2.9 Amps
Horsepower 1/4 hp 1/4 hp