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Engineering Calculators

EER2 SEER2 COP HSPF kw/Ton Converter

Instructions:

All inputs are required for full results

  1. Review the methodology to make sure it aligns with your project's requirements.

  2. Select the Efficiency Type that you want to convert from in the dropdown menu.  Options Include: 
                       COP​, EER, SEER, SEER2, HSPF, HSPF2, kW/Ton,

  3. Enter the Efficiency Value. For example, for 15 SEER equipment, enter "15".

  4. Enter the Equipment Type.  This is required when converting to and from the DOE's Jan 1, 2023, HSPF2 and SEER2 energy ratings.

  5. Click the Calculate buttons.  The results will appear in the table.

Row 1 value

Also calculated
Row 1 metric
Row 2 metric
Row 2 value
Row 3 metric
Row 3 value
Row 4 value
Row 5 value
Row 6 value
Row 7 value

Rows 1 to 3 always report COP, EER and SEER. Rows 4 to 7 report whichever metric you pick beside them, so any of the seven can be read against any other.

Corrected 2026-09: converting EER to COP now divides by 3.413, the figure this page's own method statement gives and the figure every other conversion on the sheet uses. The previous version divided that one conversion by 3.41, which read about 0.09% high.

A conversion with no finite answer prints as a dash. Entering zero is the usual way to reach one, since kW/ton and its inverses divide by the value you enter.

This EER SEER2 COP HSPF2 kw/Ton Converter Calculator allows you to convert between SEER, HSPF, the DOE's new SEER2 and HSPF2 ratings, COP, and kW/Ton. 

Visit SEER2's website to learn the Department of Energy's January 1, 2023, DOE's SEER2/SEER & HSPF2/HSPF requirements based on geographic location.

Methodology and Equations:

The following conversion equations are used in the calculator: 

EER = 0.875 x  SEER

EER = 12 / kW/Ton

COP = 3.516/ kW/Ton

COP = EER / 3.413

COP = 0.293 x HSPF

​Conversions between SEER2 and HSPF2 use RESNET's conversion factors which were created based on empirical data. The conversions are as follows:

                                                                  SEER2                    HSPF2

Single Package                             SEER x 0.96        HSPF x 0.84  

Single Split                                       SEER x 0.95        HSPF x 0.85

Small Duct High Velocity       SEER x 1.00          HSPF x 0.85

Space Constrained                    SEER x 0.99        HSPF x 0.85

(Information obtained from Energy Gauge's, Modeling of SEER2/HSPF2 and how it compares to SEER/HSPF, Dec 27,2022)

Visit SEER2's website to learn the Department of Energy's January 1, 2023, DOE's SEER2/SEER & HSPF2/HSPF requirements based on geographic location.

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