Heating and cooling system is used for a building large surfaces receiving solar energy, such as greenhouses. The building is heated with a convector heating system and cooled with a blower. This system for air conditioning is especially economical in operation. The convector (12) can be heated by a heat storage (14), heat pump (15) of by a conventional heating system. It can also be heated by combination of these arrangements. The convector transfers heat from the building (10) to the heat storage or by a heat pump to the heat storage or directly via heat pump to an air heat exchanger (26). A transparent film (13) is extended which reflects infrared radiation incident on the building during heating process.
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