The Trane XR13 heat pump can reach a SEER (Seasonal Energy Efficiency Ratio) rating of up to 14.50 and an HSPF of up to 8.50. Trane categorizes the XR13 as any one of their high efficiency performance heat pumps, a category that gives in just … [Read more...] about Trane XR13 Heat Pump Specifications, Reviews & Price