Tecogen is a leading manufacturer of Combined Heat and Power products including natural gas engine-driven cogeneration, air c ... onditioning systems and high efficiency water heaters for industrial and commercial use. Tecogen systems supply electric power, cooling or hot water while thermal energy from the engine is recovered and recycled resulting in reductions in both energy costs and greenhouse gas emissions. Tecogen has an installed base of more than 2,000 units supported by an established network of engineering, sales and service personnel across the United States. read more