A method, comprising during a vehicle engine cold start, opening a first valve coupled between a first container containing an adsorbent and a second container containing an adsorbate, circulating a first fluid through a first conduit coupled to a first heat exchanger located within the first container and a second heat exchanger located outside the first container, and circulating a second fluid through a second conduit coupled to the second heat exchanger. In this way, heat may be generated at the adsorber during a cold start and subsequently transferred to the cooling jacket of the vehicle engine and/or other vehicle compartments, thereby decreasing the warm-up time for the engine.