Variable Fan Speed Control in Greenhouses

Fan Speed Control Automates Greenhouses

Proper ventilation of a greenhouse provides fresh air to plants and cooling. If ventilation isn’t put into place, the greenhouse becomes a furnace from storing heat from the sun. By putting a ventilation system into a greenhouse, you are able to blow out hot air and bring in cool air. Using a variable fan speed control automates a ventilation system preventing heat loss in the colder months for a consistent temperature inside the greenhouse for healthier plant growth.

The K-Kontrol variable fan speed control lets you manually adjust the fan speed from 30% to 100% of output capacity, and turns fans on and off. Because the controller comes in a weather proof enclosure, it is ideal for outdoor environments, but also functions indoors.

Our weatherproof fan control is great for direct control of 120v fans/ventilators. Works great on ceiling fans with the ability to control 3-5 fans depending on ratings. The fan control is commonly used in the winter when less ventilation is required and too much cold air flow can harm greenhouses.

For more information about our fan speed control, choose a product below to visit the product page.

Prewired Variable Fan Speed Control    Variable Fan Speed Control

Manual Thermostat Controllers Automate Greenhouse Systems

Thermostat Automates Greenhouse

Automate your greenhouse heating and cooling systems with our quality manual thermostat controllers including wired and plug-in thermostats.

During the cold winter months it can be a struggle to maintain temperatures in  your greenhouse or growing structure.  Using our durable manual thermostat controllers, installation and execution to regulate warmth is simple!

The manual thermostat controllers make it easy for you to control the temperature to match your greenhouse needs if you’re choosing to use an electric heater.

Additionally the thermostat has an automatic shutoff to prevent overheating to keep your plants protected from cold and hot temperatures! By adding an electric heater with a thermostat controller, you can enjoy growing all year long!

Selecting the right thermostat, locating it to sense plant temperature and maintaining the thermostat can save considerable fuel and electricity.


When selecting a thermostat for use in the greenhouse, look for the following:

  • Moisture and dust-tight boxes
  • Capillary tube filled with a liquid or gas that expands to activate the switch

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Proper installation can also have an effect on thermostat operation. The thermostat must feel the air that the plants feel if you want to control the temperature in the plant zone.

The best locations are:

  • At plant height near the center of the greenhouse
  • Mounted on an end wall or sidewall of the green house
  • Not directly above heat pipes or in the direct line of a heating duct outlet
  • Shade the thermostat so it is out of direct sunlight

Once the thermostat has been located in your greenhouse, setup to your heater is simple!

If purchasing a thermostat with piggyback plug, like this one, then follow these instructions:

  • Plug the heater power cord into the thermostat plug
  • Adjust the thermostat dial to the desired temperature (60°F) when you want the thermostat to turn on the heater. Please note the KKontrol thermostat will auto shutoff your heater once temperature rises 3°.

If without a piggyback plug, like this one, then follow these instructions:KJ16110 Weatherproof Line Voltage Greenhouse Thermostat

  • Wire the thermostat directly to the heater
  • Adjust the thermostat dial to the desired temperature (60°F) when you want the thermostat to turn on the heater. Please note the KKontrol thermostat will auto shutoff your heater once temperature rises 3°.

Click here to see the complete instruction manual.


All thermostats should be checked for accuracy at least once a year. They can get out of calibration due to dust and dirt on the sensor.

  • Clean the sensor with a can of compressed air and wipe if there is still dirt on it.
  • Set the dial to below room temperature for 10 minutes.
  • Slowly raise the dial setting until it just makes contact.
  • Check this against an accurate wall or digital thermometer. If there is a difference, mark it and have the service person make adjustments the next time the furnace is serviced.

Slash energy costs and receive the maximum benefits year round inside your greenhouse by using KKontrol thermostats.

Choose from a variety of dependable and precise thermostat controls below.

Portable Thermostat Controller         Weatherproof Line Voltage Thermostat