Abstract: A solid adsorption air conditioning apparatus and process using water or ammonia refrigerant in a generator-condenser-evaporator-adsorber cycle wherein the refrigerant is adsorbed on a solid adsorbent coated on the interior of a combination adsorber-generator module and then generated from said adsorbent, the adsorber-generator modules alternately performing each of these functions. The apparatus and process may be used for cooling and heating functions by simple adjustment of dampers. The apparatus and process provides an air conditioning apparatus which may utilize solar heat for a substantial portion of its energy input requirements and does not require any liquid pumping.