SEER2 and HSPF2

On January 1, 2023, the rating metric for Air Conditioners and Heat Pumps are changing from SEER to SEER2 and HSPF to HSPF2. These new ratings use a modified AHRI testing procedure that reflects more realistic static pressures seen in homes today.

RESNET has adopted a conversion table between SEER and SEER2 and between HSPF and HSPF2, which is now defined by MINHERS Addendum 71f for different equipment types. Equipment type definitions can be found in the AHRI 210/240-2023 (2020): Performance Rating of Unitary Air-conditioning & Air-source Heat Pump Equipment. The table of conversion factors has been reproduced below:

Table 4.4.4.1(1) SEER2/HSPF2 Conversion Factors³ 

³ (Informative Note) Conversion factors developed by AHRI, and adopted by RESNET.

For example, an 8 HSPF ducted split system heat pump would be equivalent to a 6.8 HSPF2 split system heat pump.

Likewise, a 14 SEER ducted split system air conditioner would be equivalent to a 13.3 SEER2 split system air conditioner.

In Ekotrope Versions before Version 4.2.0 the conversions factors were defined in ANSI/RESNET 301. That table has been reproduced below:

Table 4.4.4.1(1) SEER2/HSPF2 Conversion Factors³ 

³ (Informative Note) Conversion factors developed by AHRI, and adopted by RESNET.

⁴ (Informative Note) Equipment Type definitions can be found in the AHRI 210/240-2023 (2020): Performance Rating of Unitary Air-conditioning & Air-source Heat Pump Equipment