Heat Pump Efficiency Data Concerns in Silktech Products Under Investigation All HVAC systems in the United States must follow strict federal efficiency rules before they can be sold or installed. The Silktech EcoAuro 1.0 and EcoAuro 2.0 heat pumps do not meet these required standards. For a unit with a capacity of around 8,800 BTU, federal law requires a minimum SEER2 rating of 13.4. Silktech has not provided any valid certification or test data to prove that the unit...