About The Author: Travis Baugh is a Digital Brand Marketing Manager for Bryant, where he creates clear, helpful content to guide homeowners through heating, cooling, and indoor air quality decisions. His goal is to empower readers with the knowledge they need to choose the right comfort solutions for their home—confidently and comfortably.
What is an HSPF2 Rating and Why Does it Matter for Your Home?
By Travis Baugh | Expert Review By Michelle Notaro - Product Manager, Heat Pumps
An HSPF2 rating (Heating Seasonal Performance Factor 2) measures the heating efficiency of a heat pump over an entire heating season. A higher HSPF2 rating indicates a more energy-efficient heat pump that can use less electricity to deliver the same amount of heat, all else being equal.
Understanding your heat pump’s HSPF2 rating can help you compare heating efficiency when choosing a new system and understand how efficiently your heat pump uses electricity during the heating season. Bryant heat pumps offer a range of HSPF2 ratings depending on the model, configuration and matched system. For example, the Bryant Evolution Extreme 23 Variable-Speed Heat Pump 293VAN offers up to 10.5 HSPF2, while the Evolution Extreme 21 Variable-Speed Cold Climate Heat Pump 291VAN offers up to 12.5 HSPF2.
How is the HSPF2 Rating Calculated?
The HSPF2 rating is calculated by dividing the total heating output of a heat pump (measured in British Thermal Units, or BTUs) during a typical heating season by the total electrical energy consumed (measured in watt-hours) over that same period. The resulting HSPF2 value represents the amount of heat, in BTUs, produced for each watt-hour of electricity consumed under the standardized test conditions.
To ensure accuracy, the Department of Energy (DOE) updated its HVAC test procedures beginning January 1, 2023, introducing HSPF2 and SEER2 to replace the previous HSPF and SEER ratings for applicable equipment. The updated testing procedures account for higher external static pressure, which better represents the resistance encountered as air moves through ductwork.
Because HSPF2 is based on standardized laboratory testing, it is useful for comparing equipment, but actual energy use can vary based on factors such as climate, home characteristics, system sizing, installation and operating conditions.
HSPF vs. HSPF2: What is the Difference?
The primary difference between HSPF and HSPF2 lies in the testing procedures and conditions used to determine the rating. HSPF2 uses updated, more stringent testing conditions, including higher external static pressure.
Before 2023, the industry standard was the original HSPF rating. Starting January 1, 2023, DOE's updated test procedures introduced HSPF2 as the newer heating-efficiency metric for applicable residential heat pumps.
Because the HSPF2 testing conditions are more demanding, an HSPF2 rating will numerically appear lower than an equivalent HSPF rating for the exact same unit. For example, a heat pump that previously boasted an HSPF rating of 9.0 might now hold an HSPF2 rating of around 7.6. This does not mean the equipment became less efficient; the ratings are based on different testing procedures and should not be compared as though they were the same metric.
What is a Good HSPF2 Rating for a Heat Pump?
There isn't a single HSPF2 rating that is right for every home. The appropriate efficiency level depends on the heat pump model, climate, home characteristics, installation and other factors.
As a point of reference, Bryant's current residential heat pump lineup includes models ranging from about 8 HSPF2 to more than 12 HSPF2, depending on the product and configuration. For example:
| Bryant heat pump | Compressor type | Heating efficiency |
| Evolution™ Extreme 21 Variable-Speed Cold Climate Heat Pump 291VAN | Variable-Speed | Up to 12.5 HSPF2 |
| Evolution™ Extreme 23 Variable-Speed Heat Pump 293VAN | Variable-Speed | Up to 10.5 HSPF2 |
| Evolution™ Extreme Variable Speed Heat Pump 290VAN | Variable-Speed | Up to 9.5 HSPF2 |
| Preferred™ Variable-Speed Heat Pump 249VAN | Variable-Speed | Up to 10 HSPF2 |
| Preferred™ 2-Stage Heat Pump 248TAN | Two-Stage | Up to 8.5 HSPF2 |
| Legacy™ Single-Stage Heat Pump 235SAN | Single-stage | Up to 8.1 HSPF2 |
These are published maximum ratings; actual efficiency depends on the specific size and matched system.
When evaluating a new system, it is crucial to view the HSPF2 rating through the lens of long-term value rather than just a number on a spec sheet. Systems with higher HSPF2 ratings may use less electricity for heating under the standardized rating conditions, although actual savings depend on climate, utility rates, system sizing, installation and how the system is operated.
Bryant's higher-efficiency heat pumps include variable-speed models such as the Evolution Extreme 293VAN and 291VAN. Variable-speed technology allows the heat pump to adjust its output to changing heating and cooling demands, which can support more consistent temperature control and efficient operation.
How Does a Higher HSPF2 Rating Save You Money?
Joseph Braswell, owner of Guin Service Company in Birmingham, AL, explains why a homeowner might consider HSPF2 rating when purchasing a heat pump.
“A higher HSPF2 rating allows a heat pump to operate effectively at lower outdoor temperatures than many homeowners might expect,” Braswell said. “That means you may not need to rely on your furnace except during extreme cold, which can lead to energy savings and the added comfort of avoiding hot, dry furnace air. Heat pumps with higher HSPF2 ratings are also typically quieter.”
A higher HSPF2 rating can reduce electricity consumption for heating when comparing similarly sized and configured systems under comparable operating conditions. Over a heating season, that may translate to lower heating costs, but the actual savings depend on factors such as local electricity rates, outdoor temperatures, home insulation, system sizing and installation quality.
It is common for homeowners to have objections about the upfront heat pump cost associated with high efficiency units. However, a higher HSPF2 rating can be one factor to consider when evaluating the long-term operating cost of a heat pump. Consider a family experiencing a steady increase in energy bills due to an outdated HVAC system. By upgrading to a high-efficiency model, they may have an opportunity to reduce heating-related electricity use, depending on the existing system and operating conditions.
Furthermore, high-HSPF2 systems often qualify for local rebates and utility incentives, which can help reduce the heat pump installation cost. When you factor in warranties and installation options available through Bryant, the long-term value of a high-efficiency system can be another consideration when comparing heat pumps. Don't forget to ask your Bryant dealer about financing options to break your purchase down into monthly payments.
Advanced Technology and Smart Integration in High-HSPF2 Systems
High-HSPF2 heat pumps can use advanced technologies such as variable-speed compressors or multi-stage operation to adjust system output as heating demand changes. These technologies can help optimize energy use while supporting more consistent indoor temperatures.
For example, the Bryant Evolution Extreme 23 293VAN uses variable-speed operation and can operate down to 20% capacity. Bryant also offers the Evolution Extreme 21 291VAN cold-climate heat pump, which reaches up to 12.5 HSPF2.
A premium HSPF2-rated heat pump can also be paired with a compatible smart thermostat, such as the Evolution™ Connex™ System Control, to help manage system operation. Bryant's 293VAN, for example, can be paired with an Evolution Connex System Control and InteliSense technology to share critical equipment performance data with a dealer when the homeowner grants permission.
Connect With A Bryant Dealer On The Right HSPF2 For Your Home
Connect with a local Bryant dealer to determine the right HSPF2 rating for your home’s heating needs and climate. Your local Bryant dealer can evaluate your system, insulation, home characteristics and heating requirements to recommend an efficient heat pump that balances performance and energy savings. They can also ensure proper heat pump sizing and installation to help you get the most out of your investment.
HSPF2 FAQs
No, the HSPF2 rating specifically measures heating efficiency. For cooling efficiency, you need to look at the system's SEER2 (Seasonal Energy Efficiency Ratio 2) rating, though high-HSPF2 systems generally feature excellent SEER2 ratings as well.
An HSPF2 rating is especially critical in regions with moderate to severe winters, as the heat pump will run more frequently. In these climates, a higher rating will yield exponentially greater energy savings compared to warmer climates where heating is rarely needed.
While you cannot change the manufactured HSPF2 rating of your existing unit, you can optimize its performance by sealing ductwork, improving your home's insulation, and scheduling regular professional heat pump maintenance to ensure it operates at its peak potential.
A good HSPF2 rating is typically 8.5 or higher, with 9–10+ considered high efficiency. The higher the HSPF2, the more efficient the heat pump is at producing heat during colder weather.
An HSPF2 of 8.1 is considered average to slightly below mid-range efficiency. It meets basic performance standards, but higher-rated systems can provide better energy savings over time, especially in colder climates.
About The Expert Reviewer: Michelle Notaro is a Product Manager for Residential Air Conditioners at Bryant, helping guide the direction of residential cooling products. She considers changing homeowner priorities, emerging market developments, and regulatory requirements to support air conditioning solutions that address today's comfort and efficiency expectations.
