- Air conditioning and CO2 supplementation should never be used when venting fresh air through the growing environment.
- Any closed environment garden will need CO2 supplementation
- An air-cooled closed environment garden with proper CO2 supplementation may not need air conditioning.
- Even the most well designed closed environment garden isn’t a completely closed system. Heat generated by lighting and other electrical devices must be moved out of the space, usually by means of a dual-hose or split-system air conditioner.