# Energy Conservation Program: Test Procedure for Direct Expansion-Dedicated Outdoor Air Systems
> **US Department of Energy** · Final rule. · Published 2022-07-27 · Effective 2022-08-26 · 87 FR 45164
## Document
- **Document number:** 2022-15493
- **Category:** energy-efficiency
- **Sub-agency:** US Department of Energy
- **Federal Register citation:** 87 FR 45164
- **CFR reference:** 10 CFR 429
- **Publication date:** 2022-07-27
- **Effective date:** 2022-08-26
- **Energy docket:** EERE-2017-BT-TP-0018
## Abstract

The U.S. Department of Energy ("DOE") is publishing a final rule to establish definitions for "direct expansion-dedicated outdoor air systems" ("DX-DOASes") and "unitary dedicated outdoor air systems" ("unitary DOASes"). Unitary DOASes are a category of small, large, and very large commercial package air conditioning and heating equipment under the Energy Policy and Conservation Act, as amended. In addition, DOE is establishing a test procedure to measure the energy efficiency of DX-DOASes, which aligns with the most recent version of the relevant industry consensus test standards for DX-DOASes, with certain minor modifications. Lastly, DOE is adopting supporting definitions, energy efficiency metrics for dehumidification and heating modes, and provisions governing public representations as part of this rulemaking.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2022/07/27/2022-15493/energy-conservation-program-test-procedure-for-direct-expansion-dedicated-outdoor-air-systems)
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