Tandem Chillers manufactures ground source and water source and air source heat pumps. Since designing their first modular chiller over ten years ago, Tandem has brought their vast knowledge to the design of heat pumps for alternative sources of cooling. Tandem’s heat pumps are of sound refrigeration design and easily serviced. Best of all, its heat pumps are designed in such a way that they can be removed for service without shutting down the rest of the system.