Accessory Sizing Chart for Hobby Greenhouse
Recommended accessory sizes required for most applications.  Heating equipment will maintain a greenhouse temperature 50 degrees warmer than outdoor temperature. If your greenhouse is located in colder climate you will need heaters with a higher capacity.


Click Here to Go to Technical Info - for additional information on sizing greenhouse cooling systems, heating systems and other greenhouse components.


Greenhouse approx sq. ft. Electric Heater Gas Heater Exhaust Fan Motorized Inlet Shutter Evaporative Cooling HAF Fan
108 HER50 HD30 VSF16140 VRSG20A 2600 CFM 8"
162 HER75 HD30 VSF16205 VRSG24A 2600 CFM 12"
144 HER75 HD30 VSF16205 VRSG24A 3300 CFM 12"
216 HER100 HD30 (2) VSF16140 (2) VRSG20A 4400 CFM 12"
288 Not Advised HD45 (2) VSF16205 (2) VRSG24A 4800 CFM (2) 12"
324 Not Advised HD45 (2) VSF16205 (2) VRSG24A 4400 CFM (2) 12"
432 Not Advised HD60 (2) VSF20320 (2) VRSG30A 4400 CFM (2) 12"
540 Not Advised HD60 (2) VSF20320 (2) VRSG30A 4800 CFM (2) 12"
648 Not Advised HD75 (2) VSF20450 (2) VRSG30A 4800 CFM (2) 12"