Energy Department drops a newer efficiency test for commercial warm air furnaces
The Energy Department withdraws the Thermal Efficiency Two test, which counted heat lost through the furnace casing and at part load, before any standard required it. Makers keep testing under the existing thermal efficiency method.
Who it affects
Makers of commercial warm air furnaces
When
This rule takes effect on December 7, 2026.
- : Published in the Federal Register
- : This rule takes effect
Official text
FR Doc. 2026-20517: Energy Conservation Program: Test Procedures for Commercial Warm Air Furnaces
On Federal Register. The official text is what counts; read it before you act.
Not legal advice. Plain-English summaries to help you find what changes and when. Not legal advice: read the official text, and ask a lawyer about your situation.