Preface 

This is the first edition of CSA TS-002, Dual-energy systems performance rating method. CSA Group acknowledges that the development of this Technical Specification (TS) was made possible, in part, by the financial support of BC Hydro and FortisBC Inc. This TS is considered suitable for use for conformity assessment within the stated scope of the TS. This TS was prepared by the Development Committee on Hybrid Heating (Dual-Energy) Systems Performance Rating Method, under the jurisdiction of the Technical Committee on Energy Efficiency and Related Performance of Fuel-Burning Appliances and Equipment. 

Scope 

This calculation method is applicable to unitary air-source heat pumps combined with a gas furnace and indoor coil.