How to Heat a Greenhouse Floor

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Heat a greenhouse floor with radiant heat.
Heat a greenhouse floor with radiant heat. (Image: lovely greenhouse image by Tracy Horning from Fotolia.com)

Many people don’t realize that they can heat the floor to their greenhouse by using a radiant heating system. Heat radiates from an electric cable placed on top of the concrete floor in your greenhouse. You hook the cable to an electric circuit and cover the cable with additional concrete. Radiant heat systems for your greenhouse floor can be found at your local hardware store. You will need to run an electric line to your shed with a 15 to 20 amp ground fault circuit interrupter, or GFCI, to power the radiant system.

Things You'll Need

  • Electric radiant heat system
  • Scissors
  • Construction adhesive
  • Caulking gun
  • Concrete
  • Garden hose with water
  • Wheelbarrow
  • Hoe
  • Shovel
  • Trowel

Unroll the radiant heating system over your greenhouse floor. If it is too large, use the scissors to cut the mesh to fit, making sure you don’t cut the electric cables. Plug the system into the GFCI outlet to make sure it works, then unplug it again, leaving the cord and plug next to the outlet.

Glue the wiring to the concrete floor using construction adhesive and a caulking gun. Glue only the mesh, not the electric cables, to the floor.

Mix the concrete and water from the garden hose in the wheelbarrow according to the directions on the bag of concrete. Use the hoe to mix it until it is a smooth consistency. Shovel the concrete over the top of the radiant heat system, smoothing it out with a trowel so it is even. Let the concrete cure for two to three days before walking on it or proceeding.

Plug the radiant heat system into the GFCI outlet to heat your greenhouse floor.

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