A switching device sequentially switches from having an evaporator-condenser generate an adsorbate and an adsorbent adsorb the adsorbate, to having an evaporator-condenser condense the adsorbate and an adsorbent desorb the adsorbate, such that the evaporator-condenser that generates the adsorbate and the adsorbent that adsorbs the adsorbate face each other, and the evaporator-condenser that condenses the adsorbate and the adsorbent that desorbs the adsorbate face each other. Accordingly, one adsorbent repeatedly desorbs and adsorbs in alternation, and another adsorbent repeatedly adsorbs and desorbs in alternation.