# Federal Register 2026-20517 — effective 2026-12-07 — Energy Conservation Program: Test Procedures for Commercial Warm Air Furnaces — Energy Department

For Federal Register 2026-20517, effective date is 2026-12-07; agency is Energy Department; published is 2026-10-07; cfr parts amended is 10 CFR 431; dates, as printed is The effective date of this rule is December 7, 2026, recorded from its source on 2026-10-07; source re-checked 2026-11-03.

- **FR document number:** 2026-20517 _(verified: appears in the quote below)_
- **Rule:** Energy Conservation Program: Test Procedures for Commercial Warm Air Furnaces _(verified: appears in the quote below)_
- **Agency:** Energy Department _(verified: appears in the quote below)_
- **Effective date:** 2026-12-07 _(verified: appears in the quote below)_
- **DATES, as printed:** The effective date of this rule is December 7, 2026. _(verified: appears in the quote below)_
- **CFR parts amended:** 10 CFR 431 _(our reading, not quoted from the source)_
- **Published:** 2026-10-07 _(verified: appears in the quote below)_

## What the source says

> {"document_number":"2026-20517","title":"Energy Conservation Program: Test Procedures for Commercial Warm Air Furnaces","agency_names":["Energy Department"],"effective_on":"2026-12-07","dates":"The effective date of this rule is December 7, 2026.","cfr_references":[{"chapter":null,"citation_url":null,"part":"431","title":10}],"publication_date":"2026-10-07","html_url":"https://www.federalregister.gov/documents/2026/10/07/2026-20517/energy-conservation-program-test-procedures-for-commercial-warm-air-furnaces"}

## Source

- https://www.federalregister.gov/api/v1/documents.json?per_page=1000&order=oldest&conditions%5Btype%5D%5B%5D=RULE&conditions%5Beffective_date%5D%5Bgte%5D=2026-08-31&conditions%5Beffective_date%5D%5Blte%5D=2026-12-31&fields%5B%5D=document_number&fields%5B%5D=title&fields%5B%5D=agency_names&fields%5B%5D=effective_on&fields%5B%5D=dates&fields%5B%5D=cfr_references&fields%5B%5D=publication_date&fields%5B%5D=html_url

Last verified: 2026-11-03. Review by: 2026-11-16.
Part of [Federal rules taking effect: every US final rule in the Federal Register, by effective date](https://referencesource.org/federal-rules-taking-effect/).