Below are the heating and cooling design temperature limits for the selected state and county. These limits generally
must not be exceeded in the HVAC design for a home
that will be certified in this location. See the
Design Temperature Limit Reference Guide for exceptions and details.
1% Cooling Limit
99% Heating Limit
EFFICIENCY FEATURES AT A GLANCE
2009 IECC Climate Zone 4
Below is the set of efficiency features modeled to determine the ENERGY STAR HERS Index Target for homes in Climate Zone 4. While the features are not mandatory, if they are not used then other measures will be needed to achieve the target. See National Program Requirements Version 3 (PDF, 136 KB) for complete details.
Envelope, Windows, & Doors
Insulation Install. Quality
Mass Wall Insulation
R-5 ext or R-10 int
Basement Wall Insulation
R-10 cont. or R-13 cavity
Crawlspace Wall Insulation
R-10 cont. or R-13 cavity
R-10; 2 ft
U-factor: 0.32 / SHGC: 0.40
U-factor: 0.21 / SHGC: Any
Door: ≤ 1/2 Lite
U-factor: 0.27 / SHGC: 0.30
Door: > 1/2 Lite
U-factor: 0.32 / SHGC: 0.30
Heating and Cooling Equipment
85 AFUE, ENERGY STAR
85 AFUE, ENERGY STAR
8.5 HSPF / 14.5 SEER / 12 EER
Water Heating Equipment
Efficiency varies by tank size. Common sizes shown below.
Gas Water Heater
40 gal: 0.61 EF; 60 gal: 0.57 EF
Electric Water Heater
40 gal: 0.93 EF; 60 gal: 0.91 EF
Oil Water Heaters
40 gal: 0.53 EF; 60 gal: 0.49 EF
Solar Water Heater
Thermostats & Ductwork
Location of Ducts and
Dependent on foundation & stories; Generally, not in conditioned space
Duct Insulation for Ducts
In Unconditioned Space
R-8 for attic supply ducts;
R-6 for all other ducts
Duct Leakage to Outside
≤ 4 CFM25 per 100 sq. ft. or
≤ 40 CFM25, whichever is greater
Lighting & Appliances
ENERGY STAR light bulbs in 80% of Qualifying Light Fixture Locations
ENERGY STAR Certified Modular Homes
What is a modular home?
A modular home is a prefabricated home that is made of multiple modules or sections that are manufactured and substantially assembled in a manufacturing plant. These pre–built sections are transported to the building site and constructed by a builder to meet all applicable building codes for site–built homes.
How can a modular home earn the ENERGY STAR?
A home earns the ENERGY STAR by meeting strict program requirements for energy efficiency set by the U.S. EPA. The program requirements applied to modular homes are the same as those applied to site–built homes. However, modular homes designed and produced in the plant to meet the ENERGY STAR program requirements are only "ENERGY STAR certified" after they are inspected and verified on site and receive the blue ENERGY STAR Certified Home label. Homes cannot be marketed or promoted as "ENERGY STAR labeled" or "ENERGY STAR certified" until the site verification process has been completed by a third–party verifier.
There are two ways a modular home can meet these program requirements and earn the ENERGY STAR:
Each modular home is rated by a third–party Home Energy Rater (or equivalent). The Home Energy Rater must coordinate with the plant and the site builder to verify those ENERGY STAR–related features of the home that are installed both in the plant and on–site.
Utilize the verification procedures described below which involve a plant certification process to certify that a plant has incorporated ENERGY STAR requirements into its in–plant inspection procedures and can consistently produce modules that can earn the ENERGY STAR, as well as an on–site inspection process where a third–party consultant visually checks that all ENERGY STAR requirements have been met. The plant certification process as well as oversight and enforcement of all quality assurance requirements related to designing, producing, and installing ENERGY STAR certified modular homes is the responsibility of a Quality Assurance Provider (QAP). The Systems Building Research Alliance (SBRA) has been approved by EPA as a national (QAP) for ENERGY STAR certified modular homes. For SBRA's compliance procedures for certifying modular homes, go to www.research-alliance.org.
Which Version of the Program Requirements Should I Use?
ENERGY STAR Certified Homes Implementation Schedule for Modular Homes:
Applicable to Homes with the Following Sales Date
On or after 10/01/2011
and before 01/01/2014
Version 2.5: Core Version 3 energy efficiency measures with Air Barriers and Air Sealing sections of Thermal Enclosure System Rater Checklist; Other checklists completed but not enforced
On or after 01/01/2014
Version 3: Core Version 3 energy efficiency measures with all checklists completed and enforced
Verification Procedures for ENERGY STAR Certified Modular Homes
The following verification procedures can be followed for modular homes to earn the ENERGY STAR label. These procedures include three main elements:
To produce modules for homes that, when constructed, can earn the ENERGY STAR, a manufacturing plant must first demonstrate to the satisfaction of a qualified and Quality Assurance Provider (QAP)–approved third–party consultant that it has the ability to consistently produce homes that comply with the ENERGY STAR requirements with respect to all work conducted in the plant. This results in the plant being certified by the third–party consultant to produce modules that can earn the ENERGY STAR. All work of the plant is conducted under the oversight of the third–party consultant who is a specialist in factory building with expertise in energy efficient construction.
To become certified the plant must develop procedures that address:
Education – Plant personnel must be properly trained in all ENERGY STAR requirements and procedures. Plant staff and the third–party consultant must document all in–plant and on–site ENERGY STAR requirements and procedures and provide this information to all plant personnel as well as to builders that the plant utilizes to build ENERGY STAR certified modular homes.
QA/QC process – The plant must develop compliance verification documentation and processes including the integration of ENERGY STAR provisions into the plant’s QA/QC process and have these third–party reviewed and approved
Inspecting and testing – As a condition of plant certification, the plant must have its homes third–party inspected and tested both in the plant and on site to establish the plant’s ability to routinely build compliant homes.
Maintaining plant certification – The plant must be periodically re–inspected by the third–party consultant to confirm that proper procedures remain in place and to resolve production–related problems if and as they arise.
Becoming an ENERGY STAR Partner – All plants participating in the production of modular homes to be constructed onsite as ENERGY STAR certified homes must be ENERGY STAR partners
To participate in building ENERGY STAR certified modular homes under these procedures, builders have to first demonstrate the ability to consistently meet ENERGY STAR requirements by establishing specific on–site inspection and testing procedures that includes the use of an independent third–party who can visually verify and document that each home has met all program requirements prior to earning the ENERGY STAR label, and that also includes a process for addressing non–compliance issues. These procedures must also include reporting requirements for builders to report their ENERGY STAR activity to the QAP. Builders must also be ENERGY STAR partners to use ENERGY STAR's partner–only logo and to be listed on ENERGY STAR's Partner Locator.
Compliance with ENERGY STAR requirements for each home must be verified both in the plant and at the site following procedures that are established by a QAP. These procedures must address home compliance both in the plant and at the site as follows:
In–Plant Inspection and Verification Procedures. Plants must comply with their third–party–approved QA/QC process and label each home that is to be ENERGY STAR certified with a unique identifier recognizable by the third–party field inspector. This identifier indicates to the field inspector that all ENERGY STAR requirements in the plant have been met.
On–Site Inspection and Verification Procedures. A third–party consultant must inspect, test and certify homes installed and completed by the builder on site, as well as report qualifying homes to the QAP. The QAP approves and monitors this third party, who must possess qualifications appropriate for the task as defined by the QAP. Site testing follows a sampling protocol, reflecting the fact that the manufacturing plant has been certified and has demonstrated the ability to consistently produce homes that comply with ENERGY STAR requirements.
How to Promote Your ENERGY STAR Modular Homes
ENERGY STAR provides its active partners the opportunity to utilize the ENERGY STAR brand in promoting homes that earn the ENERGY STAR label. Modular manufacturing plant and builder partners must adhere to ENERGY STAR's Brand Brand Book when promoting ENERGY STAR certified modular homes. These guidelines describe how the ENERGY STAR name and marks may be used in promotional materials. In addition, ENERGY STAR distributed a letter (657KB) and a quick logo–use reference guide (2.0MB) to all ENERGY STAR modular plant partners that provides clarification on how plants can use the ENERGY STAR brand.
Getting Started with ENERGY STAR Certified Manufactured Homes
These requirements apply to manufactured homes, defined as homes built in a factory that are subject to the federal Manufactured Home Construction and Safety Standards (commonly referred to as the HUD Code) contained in 24 CFR 3280. For site-built and modular single family homes and multifamily buildings, click on the appropriate tab above.
To earn the ENERGY STAR label, a manufactured home must meet all applicable program requirements and be produced in a plant that is certified by one of the following EPA-recognized Quality Assurance Providers (QAP’s).
The plant certification process, as well as oversight and enforcement of all quality assurance requirements related to designing, producing, and installing ENERGY STAR certified manufactured homes, is the responsibility of the QAP. Once certified, the plant must follow the QAP’s guidelines for ongoing production, installation, and certification of homes to maintain its plant certification status.
This table contains all implementation timelines applicable on or after September 1, 2016. Implementation timelines applicable prior to this date can be obtained by contacting firstname.lastname@example.org.
To determine the program Version that a manufactured home is required to be certified under, identify the production date of the home below. Note that manufactured homes produced prior to June 1, 2020 are permitted to be certified under either Version 1 or Version 2 of the program requirements.
Homes Produced On or After This Date
Must Meet the Adjacent Version
ENERGY STAR Certified Homes Version 3 Program Requirements
Sector–Specific Policies: Homes Undergoing Gut Rehabilitation
EPA allows existing homes to earn the ENERGY STAR when all requirements of the ENERGY STAR Certified Homes program are met. EPA does recognize that some of the current program requirements present unique challenges for existing homes, even those undergoing a gut rehabilitation.
To help mitigate these challenges, EPA has developed alternative compliance options for existing homes. These alternative options are for specific items on the ENERGY STAR Certified Homes Inspection Checklists and have been incorporated directly into the Inspection Checklists with the release of Revision 07. These alternatives are available for use and are listed in the Policy Record. See Recent Policy Changes and Clarifications.
While EPA does not mandate the scope of work for existing home projects, it has identified key components that may be needed to meet the ENERGY STAR Certified Homes program requirements. These include the following:
Remove exterior cladding and the outer surface of roof to install and/or verify the components on the Water Management Builder System Checklist and Thermal Enclosure System Rater Checklist
Replace or expose most systems, equipment, or components (e.g. HVAC and ducts, windows, insulation)
EPA acknowledges that additional alternatives, increased flexibility, and alternative assessment protocols would expand the number of homes able to earn the ENERGY STAR. EPA is committed to including additional alternatives as they become available so that more homes may earn the ENERGY STAR label without sacrificing performance.
These requirements apply to site-built and modular single family homes, duplexes and townhomes. Low-rise multifamily projects permitted prior to July 1, 2021, may also be certified through this program if they meet the eligibility requirements defined in the program requirements, below.
For other multifamily new construction, manufactured homes, and single family homes undergoing gut rehab, click on the appropriate tab above.
Program documents reflect Revision 11. Find details in the Policy Record.