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What is HSPF2?


What is HSPF2? HSPF2 stands for Heating Seasonal Performance Factor 2. Since heat pumps can perform two different functions, both cooling and heating they require two separate ratings SEER and HSPF2. HSPF2 is used to describe the efficiency of heat pump systems over the fall and winter seasons. The Department of Energy (DOE) assesses HVAC energy efficiency standards every six years and releases new minimum requirements based on technological advancements. HSPF2 is the new standard as of January 1, 2023, and signifies the new federally required testing standards set by the DOE. The new testing procedures more closely resemble real world conditions. HSPF numbers are heating numbers, and the bigger the HSPF2 the lower the heating operation cost.

What is considered a high HSPF2 rating?

Under ideal conditions a heat pump can transfer 300% more energy than it consumes, while a high-efficiency gas furnace is about 95% efficient. Unlike SEER2 ratings that are region specific, HSPF2 ratings apply to all regions in the United States without any differences. To follow the new HSPF2 rating system, split system heat pumps must have a minimum rating of 7.5 and 6.7 or higher for packaged heat pumps. The higher the HSPF2 rating, the more efficient the heat pump, but the best HSPF2 rating will depend on different factors, such as home size, and climate. It is always best to consult with a professional to find out which heat pump best fits your needs. A heat pump can cost you more upfront but can save you money on your energy bills in the long run.


The HSPF2 rating measures energy efficiency during a heating season. The SEER2 rating measures energy efficiency during the cooling seasons in the warmer summer months. When your heat pump is in heating mode, it pulls heat from the outdoor air and transfers it indoors. Ais is then pulled across the heat pump’s coil that heats up the refrigerant in the heat pump’s pipes, followed by a compressor that heats up the refrigerant further. The heat is then pushed out into the home by the indoor unit. HSPF2 measures the efficiency of this process seasonally.  The key difference is seasonal. For HSPF2, the total season’s heating BTUs are divided by the season’s total WATTS consumed to produce that heat. In the summer the heat pump reverses the process, controlled by the reversing valve which controls the direction the heat travels. SEER2 measures the efficiency of this process when set to cooling mode. Both SEER2 and HSPF2 ratings can be found on the energy guide sticker on your unit. The most important rating will depend on the season. However, if you live in a region where cold weather lasts longer than the warmer months then the HSPF2 rating will likely be more important to you.

Is it Time for Heat Pump Replacement?

A new heat pump is a large investment to consider for your home. The first step is to be aware of the signs that your current system is no longer working efficiently for your home. A gas heating system that has had routine maintenance performed can typically last anywhere from 15-25 years on average. On the other hand a heat pump system can last around 25 years on average. If your current system is older than 15 years old, then start planning for a replacement especially if you are experiencing frequent heater repairs, high heating bills, temperature issues, and/or poor indoor air quality. If your current heating system is well-maintained and is less than 10 years old, now is likely not the time to replace it. We recommend you always consult with a professional if you are unsure.

Contact LA Construction, Heating and Air

The efficiency ratings is just one item to consider when it comes to heat pumps. In general, a higher HSPF2 typically goes along with a higher SEER2 rating. If you are ready for heat pump replacement at your home, give us a call today or contact us online. To save you from unnecessary stress due to a malfunctioning heat pump, we are here to help you maintain a heat pump that is properly and efficiently working this winter.

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