Purchasing Energy-Efficient Residential Air-Source Heat Pumps

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The Federal Energy Management Program (FEMP) provides acquisition guidance for residential air-source heat pumps, a product category covered by ENERGY STAR. Federal laws and requirements mandate that agencies purchase ENERGY STAR-qualified products or FEMP-designated products in all product categories covered by these programs and in any acquisition actions that are not specifically exempted by law.

FEMP's acquisition guidance and associated ENERGY STAR efficiency requirements for residential air-source heat pumps apply to single package and split system models that operate on single-phase current and have cooling capacities less than 65,000 Btu/h.

Window units, ductless systems, and models that operate on three-phase electric current are excluded.

This acquisition guidance was updated in December 2018.

Find Product Efficiency Requirements

The U.S. Environmental Protection Agency (EPA) provides residential air-source heat pump program requirements and efficiency criteria on the ENERGY STAR website. Manufacturers meeting these requirements are allowed to display the ENERGY STAR label on complying models. Federal buyers can use ENERGY STAR's list of certified residential air-source heat pumps to identify or verify complying models. As of December 2018, the version 6.0 ENERGY STAR product specification for air-source heat pumps was not published. Please check ENERGY STAR’s air-source heat pumps web page for updates on the version 6.0 specification.

Make a Cost-Effective Purchase: Save $1,208 or More by Buying ENERGY STAR

FEMP has calculated that the required ENERGY STAR-qualified residential air-source heat pump saves money if priced no more than $1,208 (in 2017 dollars) above the less efficient model. The best available model saves up to $4,171. Table 1 compares three types of product purchases and calculates the lifetime cost savings of purchasing efficient models. Federal purchasers can assume products that meet ENERGY STAR efficiency requirements are life cycle cost-effective.

Table 1. Lifetime Savings for Efficient Residential Air-Source Heat Pump Models
PerformanceBest AvailableENERGY STARLess Efficient
SEER/HSPF26.1/11.015.0/8.513.0/7.7
Annual Energy Use-Heating and Cooling (kWh)6,513 kWh9,289 kWh10,422 kWh
Annual Energy Cost-Heating and Cooling ($)$560$798$895
Lifetime Energy Cost (15 years)$6,950$9,913$11,121
Lifetime Cost Savings$4,171$1,208======
View the Performance and Model Assumptions for Table 1

Performance Column

Seasonal Energy Efficiency Ratio (SEER): Shown in British thermal units per watt-hour (Btu/Wh).
Heating Season Performance Factor (HSPF): Shown in British thermal units per watt-hour (Btu/Wh).

Annual Energy Use: Based on the test method referenced in 10 CFR 430, Subpart B, Appendix M for a 36,000 Btu/h residential air-source heat pump operated 1,400 cooling mode hours and 1,400 heating mode hours per year.

Annual Energy Cost: Calculated based on an assumed electricity price of $0.086/kWh, which is the average electricity price at federal facilities throughout the United States.

Lifetime Energy Cost: The sum of the discounted values of annual energy cost with an average residential air-source heat pump life of 15 years. Future electricity price trends and a 3% discount rate are from Energy Price Indices and Discount Factors for Life-Cycle Cost Analysis - 2018: Annual Supplement to NIST Handbook 135 and NBS Special Publication 709 (NISTIR 85-3273-33).

Lifetime Cost Savings: The difference between the lifetime energy cost of the less efficient model and the lifetime energy cost of the ENERGY STAR model or best available model.

Best Available Model Column

Calculated based on the December 2018 List of Certified ENERGY STAR Products; values shown are rounded to the nearest dollar. More efficient models may be introduced to the market after FEMP's acquisition guidance is posted.

ENERGY STAR Model Column

Calculated based on current ENERGY STAR efficiency levels; values shown are rounded to the nearest dollar. Federal agencies must purchase products that meet or exceed ENERGY STAR efficiency levels.

Less Efficient Model Column

Calculated based on typical products used in non-federal applications.

Determine When ENERGY STAR Products Are Cost-Effective

An efficient product is cost-effective when the lifetime energy savings (from avoided energy costs over the life of the product, discounted to present value) exceed the additional up-front cost (if any) compared to a less efficient option. ENERGY STAR considers up-front costs and lifetime energy savings when setting required efficiency levels. Federal purchasers can assume ENERGY STAR-qualified products and products that meet FEMP-designated efficiency requirements are life cycle cost-effective. In high-use applications or when energy rates are above the federal average, purchasers may save more if they specify products that exceed federal efficiency requirements (e.g., the best available model).

Air-Source Heat Pump Cost Calculator

Local climate conditions particularly affect air-source heat pumps because the units use outdoor air as both a heat source and heat sink. An advantage of air-source heat pumps is that one system can provide both space heating and cooling in a building. Heat pumps work well in hot/dry and mixed (or moderate) climates. Cold climates require specially designed heat pumps that can operate at lower ambient temperatures before switching to resistance heating.

Users who wish to determine a product's cost-effectiveness for their application may do so using the Energy Cost Savings Calculator for Residential Air-Source Heat Pumps.

Claim an Exception to Federal Purchasing Requirements

Products meeting ENERGY STAR or FEMP-designated efficiency requirements may not be life cycle cost-effective in certain low-use applications or in locations with very low rates for electricity or natural gas. However, for most applications, purchasers will find that energy-efficient products have the lowest life cycle cost.

Agencies may claim an exception to federal purchasing requirements through a written finding that no FEMP-designated or ENERGY STAR-qualified product is available to meet functional requirements, or that no such product is life cycle cost-effective for the specific application. Learn more about federal product purchasing requirements.

Incorporate Federal Acquisition Regulation Language in Contracts

These mandatory requirements apply to all forms of procurement, including construction guide and project specifications; renovation, repair, energy service, and operation and maintenance (O&M) contracts; lease agreements; acquisitions made using purchase cards; and solicitations for offers. Federal Acquisition Regulation (FAR) Part 23.206 requires agencies to insert the clause at FAR section 52.223-15 into contracts and solicitations that deliver, acquire, furnish, or specify energy-consuming products for use in federal government facilities. To comply with FAR requirements, FEMP recommends that agencies incorporate efficiency requirements into technical specifications, the evaluation criteria of solicitations, and the evaluations of solicitation responses.

Find Federal Supply Sources

The federal supply sources for energy-efficient products are the General Services Administration (GSA) and the Defense Logistics Agency (DLA). GSA sells products through its Multiple Awards Schedules program and online shopping network, GSA Advantage!. DLA offers products through the Defense Supply Center Philadelphia and online through DOD EMALL. Products sold through DLA are codified with a 13-digit National Stock Number (NSN) and, in some cases, a two-letter Environmental Attribute Code (ENAC). The ENAC identifies items that have positive environmental characteristics and meet standards set by an approved third party, such as FEMP and ENERGY STAR.

The United Nations Standard Products and Services Code (UNSPSC) is a worldwide classification system for e-commerce. It contains more than 50,000 commodities, including many used in the federal sector, each with a unique eight-digit, four-level identification code. Manufacturers and vendors are beginning to adopt the UNSPSC classification convention and electronic procurement systems are beginning to include UNSPSC tracking in their software packages. UNSPSCs can help the federal acquisition community identify product categories covered by sustainable acquisition requirements, track purchases of products within those categories, and report on progress toward meeting sustainable acquisition goals. FEMP has developed a table of ENERGY STAR and FEMP-designated covered product categories and related UNSPSC numbers.

Residential Air-Source Heat Pump Schedules and Product Codes

GSA offers residential air-source heat pumps through Schedule 51 V (Hardware Superstore).

The DLA ENAC for residential air-source heat pumps is "LE."

The UNSPSC for residential air-source heat pumps is 40101806.

Buyer Tips: Make Informed Product Purchases

When buying directly from commercial sources, look for the seasonal energy efficiency ratio (SEER) and heating season performance factor (HSPF) on the yellow EnergyGuide label required on these products. As shown in Table 1, ENERGY STAR-qualified products need less power to operate. Buyers can use this table as a guide when replacing standard residential air-source heat pumps with more efficient products.

Federal buyers should require that residential air-source heat pumps be installed in accordance with the ENERGY STAR Quality Installation (QI) guidelines. Installation problems like oversizing, improper charging, and leaky ducts result in efficiency losses, occupant discomfort, and shortened equipment life. Requiring the contractor to follow the QI guidelines will assure that these and other problems are addressed and that the energy and cost savings are achieved.

Refrigerants with ozone destroying hydrochlorofluorocarbons (HCFCs) were commonly used in heat pumps. When retiring models that contain HCFCs, the Clean Air Act requires that certified technicians recover the refrigerant on-site and dispose of it in an environmentally friendly manner.

Many states and electric utilities offer rebates or other incentives for the purchase of ENERGY STAR-qualified products. Use the ENERGY STAR Rebate Finder to see if your local utility offers these incentives. FEMP's Energy Incentive Program helps federal agencies take advantage of these incentives by providing information about the funding-program opportunities available in each state.

User Tips: Use Products More Efficiently

When installed, operated, and maintained properly, energy-efficient residential air-source heat pumps provide years of safe and effective service. Federal users should be aware of the following user tips.

Residential heat pumps are frequently selected based on their cooling capacity. To make up for deficiencies with the heating capacity, electric resistance elements are typically added. Because of the inefficient nature of these heating elements, their use should be kept to a minimum. Consider using a programmable thermostat to minimize unnecessary operation of the unit. Thermostats specifically designed for heat pumps, which ramp the temperature up slowly to avoid activating the electric resistance heating elements, should be installed.

Regular maintenance (e.g., charging refrigerant and replacing filters) is necessary to maintain peak performance.

Lawrence Berkeley National Laboratory provided supporting analysis for this acquisition guidance.