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Thermo Cube® T-Stat

Thermo Cube
Shipping: Standard
Availability: In stock
Product Name SKU Price Qty
Model TC-3 Thermo Cube® T-Stat 10890
Model TC-21 Thermo Cube® T-Stat 10892

This thermostatically controlled outlet saves energy by running equipment only when necessary.


Maximum Rating: 1800 Watts, 15 Amps, 120 VAC. Exceeding this rating could cause the product to fail.

The Thermo Cube® is a unique and patented electrical device plugs into a standard 15-amp outlet which turns the power on automatically according to the outside air temperature.


  • 15 AMP unit plugs into any grounded 120V outlet and has two 120V receptacles for heaters or fans
  • No installation required — saves money by only operating when temperatures require
  • Maximum Rating: 1800 Watts, 15 Amps, 120 VAC
  • Dimensions: 3-3/16" W x 1-5/16" H x 1" D

Model TC-3

  • Ideal for cold climates
  • Turns on at 35° F or lower and shuts off at 45° F
  • Perfect for stock tank and pond de-icers, unheated rooms, pump houses, greenhouses, boats and RVs

Model TC-21 

  • Turns on at 78° F or higher and shuts off at 70° F
  • Ideal for all types of home and farm fans
Brand Thermo Cube

Manuals & Resources


Customer Reviews

  • 5 Stars

    Works great.

    Review by on Dec 1, 2016

    I like it!!

  • 4 Stars

    Does as expected

    Review by on Jun 16, 2016

    I bought two TC-21s, one for each of two chicken coops. They turn on in the high 70s and turn off around 70 or so. Don't expect any correlation between any nearby thermometer and this device. It turns when the device is 78 degrees +/-, not when your thermometer says the air nearby it is 78 degrees. Just ordered a TC-3 (white unit for winter use) since I'm confident in my TC-21s for summer use.

  • 5 Stars

    Great item & super customer support

    Review by on Mar 14, 2016

    Have used these items in the past and they work very well. These are for cooling. They will turn on the ventilation fans when needed and shut them down when not needed. Use these in my Chicken hen houses.

  • 5 Stars

    TC 3 thermo cube

    Review by on Mar 9, 2015

    not only does the Thermo-cube do what it's supposed to do, this company will stand behind their product..i burned one of those cubes out by not reading the fine print-no more than 1800 watts, and when i posted a bad review, they actually followed up on my situation..i didn't ask for a replacement once i realized i was at fault, but they sent a second one to me at no charge-wow..i can honestly say, at least in my case, this is a great company with a great product..with the replacement, i can now sleep at night and in the morning, knowing my water lines are not gonna freeze-and that's a comforting thought when it's 15° with a forever north wind blowing (i can sleep in my warm bed, and not have to venture out in the cold, turning heaters on and off)..thanx guys, especially Ryan - i think you went above and beyond your job spec to make a customer happy..again, great product, great people-buy one here if you need one..

  • 1 Stars

    rock bottom POS

    Review by on Jun 1, 2014

    This thing does not work! It is supposed t shut off below 70*. It never shuts off. I put it in my freezer and it still didn't shut off.

  • 3 Stars

    operation varies between units

    Review by on Jun 28, 2013

    I purchased a 2nd TC-21 for use in my barn - located about 10 feet away from my first - both operating box fans (not blowing at each other). However the newer unit stays on much longer than than my original TC-21 when the temperatures drop- this is frustrating that they do not have tighter tolerances on these. There is not temperature variation between the locations of the two units. While they do work I don't necessarily trust their temperature range. I have not been able to catch them in action to see how close they turn on together though. QC does have a great price on these though.

  • 5 Stars

    So far, an excellent product

    Review by on Jun 11, 2013

    I just received the TC-21 thermocube about a week ago. I'd been looking for a thermostatically controlled box fan for a few years that I could afford to replace every couple of years in the greenhouse. (The plastic blades would fall off after a couple of years of enduring extreme cold winters followed by 22 hr. hot sunny days in the summer.) I now have a plain box fan plugged into the cube and am amazed at how well it works. No more running in and out of the house to plug and unplug the fan when it's too hot or cold and the cube is saving me a boatload of $$ by allowing me to purchase the plain old box fan when I find it on sale.

  • 5 Stars

    Works Excellently

    Review by on May 17, 2013

    Great product.

  • 5 Stars

    This is a great product!

    Review by on Aug 12, 2010

    I have the TC-21 Thermocube hooked up to a box fan in my chicken coop. When the temperature starts getting too warm, the Thermocube turns my fan on at 78 degrees. I also purchased the TC-3 Thermocube for winter use (water heater). These are great products! I will be purchasing more of them.

  • 5 Stars

    tc-3 thermo cube

    Review by on Jan 4, 2010

    i got my 1st one last year and put it in my pump house for freezeing safty, worked awsomely,got the others for my travel trailer, then my wash room, dont have to go out and turn on and off lights to keep from frozen pipes, ive got them pluged into clip on light, and ive found them in other stores but no-one compared on ur price thanks

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