Commercial Warm Air Furnaces
The Department of Energy (DOE) has regulated the energy efficiency level of commercial warm air furnaces since 1994. Commercial warm air furnaces are self-contained oil-fired or gas-fired furnaces that are designed to supply heated air through ducts to spaces that require it. Commercial warm air furnaces are industrial equipment and have a maximum rated input capacity of 225,000 British thermal units (Btu) an hour or more.
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DOE published a request for information regarding energy conservation standards for commercial warm air furnaces. 78 FR 25627 (May 2, 2013). For more information, please see the rulemaking webpage.
Standards for Commercial Warm Air Furnaces
The following content summarizes the energy conservation standards for commercial warm air furnaces. The text is not an official reproduction of the Code of Federal Regulations and should not be used for legal research or citation.
The standard covers gas-fired and oil-fired warm air furnaces that are industrial equipment and that have a capacity (maximum rated input) of 225,000 Btu per hour or more. Commercial warm air furnaces manufactured and distributed in commerce, as defined by 42 U.S.C. 6291 (16), on or after January 1, 1994, must meet the energy conservation standards specified in the Code of Federal Regulations, 10 CFR 431.77. This information is also available in the Electronic Code of Federal Regulations.
Table 1. Energy Conservation Standards for Commercial Warm Air Furnaces
||Minimum Thermal Efficiency at the Maximum Rated Capacity (%)
|Gas-fired Commercial Warm Air Furnace
|Oil-fired Commercial Warm Air Furnace
- Final Rule: Standards, Federal Register, 69 FR 61916 (Oct. 21, 2004)
- Docket No. EERE-2006-TP-0092 contains all notices, public comments, public meeting transcripts, and supporting documents.
For further guidance or to submit questions related to the implementation of this standard, visit the Guidance and Frequently Asked Questions page.
Current Test Procedure
To determine compliance with DOE standards, manufacturers must follow the test procedures specified at 10 CFR 431.76 for commercial warm air furnaces manufactured or distributed into commerce. These are also in the Electronic Code of Federal Regulations.
Amended Test Procedures
DOE published a final rule amending the test procedure for commercial warm air furnaces to incorporate by reference the test procedures specified in Underwriters Laboratories (UL) 727-2006 and ANSI Z21.47-2006. Compliance with the amended test procedure is required on or after May 13, 2013.
For further guidance or to submit questions related to the implementation of this test procedure, visit the Guidance and Frequently Asked Questions page.
Test procedure waivers have not been issued for commercial warm air furnaces.
For information about obtaining test procedure waivers, see 10 CFR section 431 subpart V.
DOE's Office of Hearings and Appeals has not authorized exception relief for commercial warm air furnaces.
For information about obtaining exception relief, see 10 CFR part 1003.
State Exemptions to Federal Pre-emption
DOE has not exempted any state from this energy conservation standard. States may petition DOE to exempt a state regulation from preemption by the Federal energy conservation standard. States may also petition DOE to withdraw such exemptions. For details, see 10 CFR part 431 subpart W.
The current energy conservation standards for commercial warm air furnaces are mandated by Part A–1, the "Certain Industrial Equipment" of Title III of the Energy Policy and Conservation Act (EPCA), as amended. (42 U.S.C. 6311–6317). This equipment is treated as covered equipment under Part A-1. (42 U.S.C. 6311(1)(J)).
EPCA sets energy conservation standards for warm air furnaces. (42 U.S.C. 6313(a)(4)) EPCA established Federal energy conservation standards that generally correspond to the levels set in the American Society of Heating, Refrigeration, and Air-Conditioning Engineers (ASHRAE) Standard 90.1.
EPCA directs DOE to amend the existing test procedure for each type of equipment listed each time ASHRAE Standard 90.1 is amended with respect to such equipment. (42 U.S.C. 6314(4)) On October 29, 2010, ASHRAE officially released ASHRAE Standard 90.1-2010, in which it amended its test procedure for commercial warm air furnaces. Consequently, on May 16, 2012, the Energy Department amended its commercial warm air furnace test procedure.
Helpful Links and Contact Information
Find tips and guidance for making your home, workplace, or vehicle more energy efficient visit EnergySavers.gov.
For more information related to the regulation of this product, please email: