DEER Change Log History: None

File Start Date End Date Date posted Notes
_EUL_basis__202406251137.xlsx 2026 Jan 1 2024 May 9

With the finalization of the residential EUL study, the DEER2026 EUL_IDs are updated as follows:

EUL_ID EUL_Yrs
HV-ResHP 23
HV-EffFurn 30
WtrHt-HtPmp-Res 20
WtrHt-Res-Gas 25
TO_UPDATE_EUL_basis.xlsx 2024 May 9

Per the final Residential HVAC and DHW Measure Effective Useful Life Study of 2024-04-09, the following changes have been made:

  • HV-ResHP (DEER2026) EUL/RUL extended to 23/7.67 years
  • WtrHt-HtPmp-Res (DEER2026) added with EUL/RUL of 20/6.67 years
  • WtrHt-Res-Gas (DEER2026) EUL/RUL extended to 25/8.33 years
  • WtrHt-Instant-Res (DEER2014) revised BasisType from "rated years" to "evaluated years"
  • HV-EffFurn (DEER2026) added with EUL/RUL of 30/10 years (and expired DEER2014 version)