The passive greenhouses are independent of any conventional energetic infrastructures (electricity, gas, hot water, etc.) They are relying exclu sively on alternative energy sources: sun, wind, geo-thermal, etc. Their extensive use facilitates a massive ecological reconstruction of our pla net, which could eventually reduce the CO
con cen tration in the atmosphere and the consequent global heating. The paper is approaching the passive greenhouses’ control, proposing a fuzzy-interpolative controller with internal model. Simulations performed with a structural model are provided.