10 CFR § 434.508 - Determination of the design energy consumption and design energy cost.
---
identifier: "/us/cfr/t10/s434.508"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "10 CFR § 434.508 - Determination of the design energy consumption and design energy cost."
title_number: 10
title_name: "Energy"
section_number: "434.508"
section_name: "Determination of the design energy consumption and design energy cost."
chapter_name: "DEPARTMENT OF ENERGY"
subchapter_number: "D"
subchapter_name: "ENERGY CONSERVATION"
part_number: "434"
part_name: "ENERGY CODE FOR NEW FEDERAL COMMERCIAL AND MULTI-FAMILY HIGH RISE RESIDENTIAL BUILDINGS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 6831-6832, 6834-6836; 42 U.S.C. 8253-54; 42 U.S.C. 7101,"
regulatory_source: "65 FR 60012, Oct. 6, 2000, unless otherwise noted."
cfr_part: "434"
---
# 434.508 Determination of the design energy consumption and design energy cost.
508.1 The Design Energy Consumption shall be calculated by modeling the Proposed Design using the same methods, assumptions, climate data, and simulation tool as were used to establish the Energy Cost Budget, except as explicitly stated in 509 through 534. The Design Energy Cost shall be calculated per Equation 508.1.
Based on:
DECOS<sub>m</sub> = DECON<sub>ml</sub> × ECOS<sub>ml</sub> + . . . + DECON<sub>mi</sub> × ECOS<sub>mi</sub> (Equation 508.1.2)
Where:
DECOS = The annual Design Energy Cost
DECOS<sub>m</sub> = The monthly Design Energy Cost
DECON<sub>mi</sub> = The monthly Design Energy Consumption of the i<sub>th</sub> type of energy
ECOS<sub>mi</sub> = The monthly Energy Cost per unit of the i<sub>th</sub> type of energy
The DECON<sub>mi</sub> shall be calculated from the first day through the last day of the month, inclusive.