An apparatus for controlling the environment in a greenhouse, comprising: a first heat exchanger (350), comprising a first radiator (352) and a first fan system (354) to conduct air through the first radiator and a second heat exchanger (370) comprising a second radiator (372) and a second fan system (374) to conduct air through the second radiator； a first coolant circulation system (360) that circulates the coolant fluid between and through the first and second radiators； a controllable heater (41) for heating the refrigerant； a controller (342) that controls the apparatus to operate selectively in the maintenance mode or in the discharge mode, where in the maintenance mode the heater heats the refrigerant and the first and second fan systems conduct the air from the outside into the greenhouse through the first and second radiators to acquire heat from the refrigerant, and in the discharge mode the first fan system expels the air from the inside to the outside of the greenhouse through the first radiator so that deposit the heat in the refrigerant and the second fan system conducts the air from the outside into the greenhouse and through the second radiator so that it acquires the heat deposited in the refrigerant.Un aparato para controlar el ambiente en un invernadero, que comprende: un primer intercambiador de calor (350), que comprende un primer radiador (352) y un primer sistema de ventiladores (354) para que conduzcan el aire a través del primer radiador y un segundo intercambiador de calor (370) que comprende un segundo radiador (372) y un segundo sistema de ventiladores (374) para que conduzcan el aire a través del segundo radiador； un primer sistema de circulación de refrigerante (360) que circula el fluido refrigerante entre y a través del primer y segundo radiadores； un calentador (41) controlable para calentar el refrigerante； un controlador (342) que controla el aparato para que opere selectivamente en el modo de mantenimiento o en el modo de descarga
