The device for regulating air in hothouses includes a salt solution pool, an air-salt solution-steam heat exchanger of direct contacting, a salt evaporator, and a set of circulating system of salt solution. The salt solution is exchanged between the pool and the heat exchanger as well as between the pool and the evaporator. There are a condenser and the 1st ad 2nd air circulating systems connected with the evaporator. The 1st system is used to exchange air between the heat exchanger and the hothouse and to dry the air in the heat exchanger. The 2nd system is used to exchange air between the evaporator and the condenser and to evaporate the water contained in the salt solution of the evaporator. The steam produced by the salt solution evaporator is condensed in the condenser, which transfers the heat produced to the air in the hothouse. |