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In summer or winter, even at below freezing temperatures outside, SPP evacuated tube solar thermal collectors produce an abundance of heat. The system is designed so that this heat is transferred into the absorption system, either reducing or eliminating the operation of the existing cooling and heating system. This makes possible free solar air conditioning in the summer, and free solar heating in the winter.
Propylene Glycol (food-grade antifreeze) heat transfer solution and a simple but carefully designed piping system.