PURPOSE: To further improve the efficiency of cooling and heating operation of an adsorption type air-conditioner where cooling and heating are carried out by using latent heat of evaporation and heat of condensation caused by adsorption and desorption of working medium such as water by adsorbent such as zeolite, by setting cycle time optimum for operating conditions.

CONSTITUTION: Two or more adsorption type refrigerating units U1 and U2 are installed in parallel and each has a closed container 1 which is filled with working medium Wb and encloses a heat exchanger 2 with adsorbent which absorbs the working medium Wb when cooled by a cooler 12 and desorbs the working medium Wb when heated by a heater 11. Heat-exchange between the working media Wa and Wb takes place at working medium heat exchangers 5 as the working medium Wb is adsorbed and desorbed by the heat exchangers 2, and the heat exchangers 5 are alternately connected to an indoor heat exchanger 22 and an outdoor heat exchanger 21 to perform cooling and heating operation. A temperature detector 41 is provided to detect the outlet temperatures of the heater 11, and tire higher the outlet temperature, the longer the process switching cycle time of the refrigerating units U1 and U2 is set by a controller 10.