BioTherm builds the systems that let a grower decide what the weather is inside a greenhouse. Root-zone heating runs beneath the growing surface. Boilers and dehumidification hold air temperature and humidity. C-Gen generates CO2 on demand, and dissolved gas and oxygen systems put it into the irrigation water itself. Circulation fans keep all of it even from one end of the building to the other.

Individually they’re pieces of equipment. Together they’re a controllable climate — which is the actual product, and the reason a crop yields what it yields. The company has been building them for forty-five years.