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Eventherm T-Stat

Eventherm , TH-4-20
QC Supply Part #: 10032
Shipping: Standard
Availability: Out of stock

Ideal as an ag fan thermostat or cooling thermostat.


The Eventherm Agricultural Thermostat is used for precise control of heating, ventilation and cooling systems. Each one is built with a stainless steel sensing coil mounted to a weather-proof ABS plastic enclosure. The adjustable knob pointer disc allows the thermostat to be recalibrated.

This thermostat is resistant to moisture and gases found in corrosive agricultural buildings. Great for livestock confinement buildings, greenhouses, warehouses and industrial buildings


  • Stainless steel sensing coil
  • Accurate
  • ABS plastic weather-proof enclosure
  • 2 conduit or cable gland openings maximum
  • Gasket for lid and sealed spiral entries
  • Single pole, double throw switch
  • Screw terminals
  • Knob can be temperature scale calibrated and is unlocked with a small Phillips screwdriver


  • 40° F to 105° F temp range
  • 110/240V AC, 50/60 Hz. Full load. 16 A (resistive)
  • Differential: 2, 4° F
  • Model #: TH-4-20
  • Dimensions: 6 1/2" H (with ears) x 3" D (with knob) x 4 1/2" W (with coil)
  • Weight: 1 lb.
Brand Eventherm
Manufacturer Part Number TH-4-20

Manuals & Resources


Customer Reviews

  • 5 Stars

    Good product, good price

    Review by on Jan 4, 2017

    Installed Eventherm in cold-weather doghouse located in a town at 10,500 feet elevation, average daytime winter temperatures ~12 F. Very challenging environment. Eventherm is highly responsive, and performed well. Factory calibration appears to be about 8 degrees "off" but that's not important in this application. What is important is that when the Eventherm is set at 82 F it accurately and consistently maintains floor temp at 63 F. So I recommend Eventherm. And I have no complaints about QC Supply.

  • 5 Stars

    It works

    Review by on Jun 16, 2016

    Fast shipping item is just as described

  • 5 Stars

    Great product at a good price.

    Review by on Sep 12, 2015

    I've used a couple more expensive units and this one seems to work as good or possibly better. Easier to hook up and can be adjusted which is a plus.

  • 5 Stars

    GREAT Thermostat

    Review by on Aug 6, 2015

    works great easy to install

  • 5 Stars

    Works great for the $$$

    Review by on May 26, 2015

    $$$$ cost effective solution

  • 5 Stars


    Review by on May 21, 2015

    I'll buy again

  • 5 Stars

    Good !!!!

    Review by on Jun 29, 2014

    Good !!!!

  • 5 Stars

    Good units will get more

    Review by on Jun 18, 2014

    review Hugh? ok.... this is a very nice unit, far superior than the MasterCraft that one finds in home depot or such places, for less money. So that in itself is a great big start. The installation is easy but a bit tricky, at some point you need to open this unit. Please do that as the first thing preferably on a bench of sorts. With a sharp chisel remove some of the plastic barrel where the screw fits into, other wise you will not be able to seat a lock nut for your connector. if possible make all the connections out side of the box, other than wire nuts. It should be 3 x (by) 3 meaning the connecting wire should be twisted together with 3" removed from the outer shielding with a 3" single wire lead. There is not much room in the box. Hook the single wire onto the screw and DO NOT just slide it behind the washer. The white wire is a constant on the left and the black is on the right OR center. Other wise pretty straight forward, I have 5 units connected to 5, 1/2 Hp blowers and it just works like Jim Dandy. Oh before opening be sure to tape down the plastic retainer for the coil it can be easily lost if you don't. Other wise it is a very nice unit keeps my attic well ventilated today it was 120 degrees in there. Also use a fresh #2 phillips driver for the screws, otherwise it is a bit tricky Metric drive is a bit bigger than our #2.

  • 5 Stars

    Worked great

    Review by on Apr 7, 2014

    Easy to setup and worked as advertised.

  • 5 Stars


    Review by on Feb 21, 2014

    I've had a couple of these for several years. I have never used them outside but I use them to control fans and temperature in a small room indoors and they've worked flawlessly.

  • 4 Stars

    ordered 9 units and installed all

    Review by on Feb 9, 2014

    just installed 9 units. simple and easy to instal. i will order more if they work up to the task

  • 5 Stars

    Eventherm T-Stat

    Review by on May 3, 2011

    great item works great high quality, super fast shipping

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