Described are various embodiments of a cooling pack. In one such embodiment a cooling pack is provided for cooling a crotch region of a human while seated on a seating surface, the cooling pack comprising a tapered container for holding a cooling material therein, and defined by tapering upper and lower surfaces drawing into a tapered edge to be positioned between the crotch region and the seating surface in use, thereby providing cooling for the region.

A heating system and method for heating the interior of a vehicle, such as a motor vehicle, which has an air-air heat exchanger having a heat storage medium, and which is configured to transfer heat between exhaust air, drawn out of the interior, and intake air, supplied to the interior from the vehicle environment, between the exhaust air and the heat storage medium, and between the intake air and the heat storage medium.

A switch-mode power supply waste heat recovery and utilization system includes a switch-mode power supply unit, an air conditioner and a water storage tank that are all connected with pipes. The switch-mode power supply unit, the air conditioner and the water storage tank are in communication with each other through the pipes. The switch-mode power supply unit includes a cabinet. Fixed plates are fixedly connected to an inner side wall of the cabinet and arranged at equal intervals. A top and a bottom of the cabinet and respective interiors of the fixed plates are formed with cavities. The pipes are in communication with the cavities. A fan is fixedly connected to a side wall of the water storage tank, and is matched with the water storage tank. A filter screen is insertedly connected to an inner side wall of the water storage tank. A filter cotton is horizontally provided under the filter screen.