Commercial Greenhouse Forced Air Greenhouse Heating System

When you need supplemental heating, forced-air heating for your greenhouse offers great value for your money.

Commercial forced-air greenhouse heaters, also known as unit heaters, blow hot air from their heat source into the greenhouse environment where horizontal airflow fans (HAF) or vertical airflow fans (VAFS) circulate the heated air throughout the space.

The circulation fans in combination with the unit heaters allow for even heat distribution in the greenhouse space.

You can power forced-air greenhouse heaters by burning fuel (natural gas, propane, and oil), or they operate from a hot water system, or even from an electrical heating element.

Forced air unit heaters for greenhouses are typically mounted overhead but can also be mounted on sidewalls.

Bent-tube heaters, a newer forced-air gas unit heater with thermal efficiency between 83% to 87%, provide an excellent compact solution for greenhouse heating.

They direct a flame through a tube (fire-tube) and use a fan or blower to push heat from the tube into the greenhouse.

If you are in the market for a forced air greenhouse heater, Prospiant offers many brands of unit heaters for you to choose from to add warmth to your commercial greenhouse. We also carry the parts for these unit heaters to make repairs.

Our installers can quickly set up your forced-air heating system. There’s no need to manage a full construction project when you can take advantage of the easy installation we offer.

Reach out to our experts and learn more about how we can deliver forced-air heating solutions to address your greenhouse heating needs.

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A forced air greenhouse heater is a great choice for supplemental heating.


  • Quickly increase greenhouse temperatures
  • Reduce energy consumption and costs with the excellent thermal efficiency of forced air greenhouse heaters
  • Space-saving design: mount overhead to free up floor space
  • Cost-effective: Our heaters provide similar heat output to more expensive industrial heaters
  • Easy, straightforward installation
  • Available in electric, gas-fired, oil-fired, and hot-water styles
  • Can use external air for combustion instead of greenhouse air
  • You may be eligible for tax breaks on a high-efficiency forced-air greenhouse heater to help offset the cost
You can mount a forced air greenhouse heater overhead to save space.

Ideal for:

  • Freestanding greenhouses
  • Smaller greenhouses
  • Production or retail greenhouses
  • Back-up for other heating systems

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Commercial Brochure

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High-Efficiency Heating with a Forced-Air Greenhouse Heater

With more cities and states requiring heating systems with as much as 92% to 97% efficiency, the advances made in improving the effectiveness of forced-air unit heaters over the years mean they’re still a popular heating choice for growers.

Gas unit heaters have either standard efficiency (82%) or high-efficiency (92% to 97%) ratings.

Gas unit heaters with high-efficiency ratings convert a larger percentage of energy or fuel input into usable heat, which helps reduce energy costs by lowering energy consumption.

Gas unit heaters that fall in the high-efficiency category have two important features:

  • Large tube surface area: Compared to unit heaters with standard efficiency ratings, high-efficiency heaters have more surface area inside their tubes where hot gases pass through, which allows more time for the exhaust gases to cool. As a result, the unit can extract more heat for use in the greenhouse.
  • Condensing system with separated combustion, meaning it draws combustion air from outside of the greenhouse. This keeps exhaust gases separate from the air inside the greenhouse to prevent contamination of the growing environment.

Separated-combustion gas heaters have one intake vent for drawing in combustion air and a second vent for expelling exhaust. This design creates neutral air pressure inside the greenhouse.

In contrast, a power-exhausted gas heater has one flue vent that obtains combustion air from within the greenhouse and discharges it through a flue vent to the outdoors. This action creates a slight negative pressure on the greenhouse.

A gas unit heater with a high-efficiency rating typically offers better seasonal efficiency, meaning they provide more consistent and economical heating throughout the entire season than their standard-efficiency rated counterparts because do so well at optimizing fuel usage and minimizing waste.

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