Price: $135.00
Availability: Factory Direct - Usually ships in 2 to 4 days.
This thermostat is very accurate and can be used to control heating or cooling equipment. It has a NEMA 4X waterproof enclosure which was developed with harsh greenhouse environments in mind (it can even be used outdoors). The JDDT1 thermostat has a 10' waterproof temperature sensor which allows you to control temperatures remotely, and it retains settings in memory in case of power failure. The current temperature is shown on the digital display when thermostat is on.

Digital Thermostat Features

  • Huge temperature range: -50° to 302° F
  • Adjustable 1° to 20° F degree temperature differential
  • Comes with a 10' waterproof temperature sensor
  • Can handle 10 full load amps @120V
  • Weatherproof enclosure
  • Can be used for heating or cooling
  • Bright easy to read digital display
  • Built-in memory retains settings in power outage
  • For use with 120v equipment only

Thermostat placement in a greenhouse: To get the desired temperature, thermostats should be located at plant height near the center of the greenhouse where they are not influenced by drafts or the temperature of an exterior wall. It is best if both heating and cooling thermostats are located together and protected from direct contact with sunlight and water. One simple way to accomplish this would be to mount the thermostat(s) to a piece of wood (or other nonconductive material) with a top on it like in the picture to the left. Wood should be painted white to shade it from the sun.

What is a Differential? The difference between on and off setpoints on a control. For temperature, it is the difference in degrees between the thermostat's on and off setting. If you set a heating thermostat with a 3 degree differential to 71°, it will supply power at any temperature below 71° and cut off at 74° (3 degrees above the setpoint). A cooling thermostat would cut on above 71° and off at 68°.

Product Manuals, Tips, Specs, & Guides

JDDT1 Instruction Manual

Overall Customer Rating of 2 Reviews:
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Best Option for Our Needs

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We have a small 15 x 20 greenhouse with a propane heater that I oversized because we are going to expand it in the future. In hindsight, I should have just gotten a second heater when that time came. We had some issues with the unit short cycling so I bought this thermostat so that I could set a custom diffferntial. It works great and solved our issue.

Corvallis, OR


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The device worked as described and was easy to wire up and install. I can't comment on the durability because I haven't had it long enough to let the weather test it out.