HSPF2 is the new, more rigorous standard for measuring the heating efficiency of a heat pump over a typical winter season. A higher HSPF2 rating means the unit will use less electricity to keep your home warm, even when it's cold outside. This metric is a key part of the SEER2 rating system introduced in 2023. You can find these ratings for all our heat pump systems in the technical data section. Choosing a high-HSPF2 unit is essential for homeowners in colder climates who want to save on winter heating costs. Many of our Cooper&Hunter models lead the industry in heating efficiency. It is a vital number to look for when you sort by BTU.