A method and device for altering the temperature of a premises, wherein a medium in the summertime is cooled by the cool night air and is brought into a floor layer directly under the premises for cooling the premises during the day. In order to minimize the risk of migration of moisture from the ground and upwards to the floor layer, the floor layer and an underlying foundation are cooled so that at least an upper portion of the floor layer reaches a minimum temperature which substantially exceeds the temperature of the ground under the foundation.
A heating and cooling system and a method for controlling and regulating the temperature within a building envelope (10) having roof and wall cavities (14) adapted to receive replaceable foam liquid. The interior of the building envelope (10) is maintained at any specific controlled temperature by controlling the temperature of the liquid foam. The temperature of the liquid foam within the roof and wall cavities (14) is sensed and when a change in temperature is detected, a dynamic liquid foam regeneration unit is triggered so as to supply new liquid foam at an appropriate temperature so as to maintain the overall temperature of the liquid foam in the roof and wall cavities (14) substantially constant.
