June sought estimates from several HVAC companies and was especially intrigued by Redinger’s suggestion that a wall-mounted heat pump might be the ideal solution. Not only was the food bank stiflingly ...

Heat packs that contain iron and water packets: Exposing the solution to air results in the oxidation of the iron (creates rust). The oxidation of the iron is an exothermic process. Heat packs that ...

When it is exposed to air, the iron begins to rust. This rusting process produces heat. The second contains a solution of the chemical sodium acetate and a small metal disc. When the disc is bent, ...