ENERGY STAR® Program Requirements
for Furnaces
Eligibility Criteria
Version 2.0
Below is the Version 2.0 product specification for ENERGY STAR qualified furnaces. A product must
meet all of the identified criteria to earn the ENERGY STAR. Please note that this specification is intended
for furnaces installed and used in residences.
1) Definitions: Below are the definitions of the relevant terms in this document.
A.	Furnace: A heating unit with a heat input rate of less than 225,000 Btu per hour whose function is
the combustion of fossil fuel for space heating with forced hot air. Unit must include burner(s), heat
exchanger(s), blower(s) and connections to heating ducts. A heating unit that meets this definition
and also provides hot water for domestic or other use may be considered a furnace for purposes of
this agreement.
B.	AFUE: The Annual Fuel Utilization Efficiency ("AFUE") measures the amount of fuel converted to
space heat in proportion to the amount of fuel entering the furnace. This is commonly expressed as a
percentage. For purposes of this agreement, the efficiency of a furnace shall be measured using
AFUE. Test procedures have been developed to test AFUE by the Department of Energy (DOE).
These procedures are specified in 10 Code of Federal Regulations (CFR) part 430, Appendix N.
C.	Manufacturer Limited Warranty: For purposes of this agreement, a manufacturer limited warranty
is an assurance by the Partner that purchased system equipment and components are warranted by
the manufacturer for a period of time. The period of time is typically expressed in numbers of years.1
The exact terms of the limited warranty shall be determined by the Partner.
2) Qualifying Products: Any furnace that meets the definition in Section 1A is eligible for ENERGY STAR
qualification.
3) Energy-Efficiency Specifications: Only those products listed in Section 2 that meet the following Tier I
and Tier II criteria may qualify as ENERGY STAR. Proposed effective dates for Tiers I and II are
covered in Section 5 of this specification.
Tier I
A.	Gas furnace models: > 90% AFUE rating
B.	Oil furnace models: > 83% AFUE rating
In addition Partner will:
•	Include a manufacturer limited warranty with its qualified furnace models.
•	Consider using high efficiency electric blower motors with its qualified furnace models.
1 At the time of writing, a manufacturer limited warranty is typically 20 years for the heat exchanger(s).

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Tier II
A.	Gas furnace models: > 90% AFUE rating and TBD requirement for electrical efficiency
B.	Oil furnace models: > 85% AFUE rating and TBD requirement for electrical efficiency
In addition Partner will:
• Include a manufacturer limited warranty with its qualified furnace models.
4) Test Criteria: Manufacturers are required to perform tests and self-certify those product models that
meet the ENERGY STAR guidelines. Partner agrees to measure a furnace model's energy-efficiency
using the test conditions as specified in 10 CFR Part 430, Appendix N.
5) Effective Date: The date that manufacturers may begin to qualify products as ENERGY STAR, under
this Version 2.0 specification, will be defined as the effective date of the agreement. Any previously
executed agreement on the subject of ENERGY STAR qualified furnaces shall be terminated effective
October 26, 2006.
A.	Qualifying Products Under Tier I of the Version 2.0 Specification: The first phase of this
specification is proposed to commence on October 27, 2006. All products, including models
originally qualified under Version 1.3, with a date of manufacture on or after October 27, 2006,
must meet the new (Version 2.0) requirements in order to qualify for ENERGY STAR. The date
of manufacture is specific to each unit and is the date (e.g., month and year) of which a unit is
considered to be completely assembled.
B.	Qualifying Products Under Tier II of the Version 2.0 Specification: The second phase of this
specification, Tier II, is proposed to commence on October 1, 2008. All products, including
models originally qualified under Tier I, with a date of manufacture on or after October 1, 2008,
must meet the Tier II requirements in order to qualify for ENERGY STAR.
C.	EPA will not allow grandfathering under this Version 2.0 ENERGY STAR specification. ENERGY
STAR qualification under previous Versions is not automatically granted for the life of the
product model. Therefore, any product sold, marketed, or identified by the manufacturing
partner as ENERGY STAR must meet the current specification in effect at the time of
manufacture of the product.
6) Future Specification Revisions: EPA reserves the right to revise the specification should technological
and/or market changes affect its usefulness to consumers or industry or its impact on the environment.
In keeping with current policy, revisions to the specification will be discussed with stakeholders.

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