Device for producing by chemical reaction cold and/or heat, comprising two reactors containing each an associated salt susceptible of reacting chemically with a gas and dispersed into a porous support, a housing intended to receive the gas from the reactors and a housing intended to deliver the gas to the reactors. Accordingly to the invention, the reactors are arranged in direct contact and in such a way that the heat transfer between each other takes place only by conduction. A process for implementing the chemical reactions between at least one salt and one gas within such a device to product cold and/or heat is also disclosed.