HSPF2 Ratios Explained

Two Trane XL heat pumps positioned side by side outside a house. The house's exterior wall and surrounding grass are visible, illustrating efficient Trane HVAC systems.

HSPF2 measures a heat pump’s heating efficiency. The DOE requires a minimum rating of 7.5 for split systems and 6.7 for single-packaged heat pumps.

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