District of Columbia's climate, for sizing
- IECC climate zone
- 4A · mixed humid
- Typical winter low
- 15°F to 25°F
Mid-Atlantic mixed climate. A standard high-efficiency heat pump handles DC winters fine. Cold-climate equipment is overkill for the actual design temperature. Row-house retrofits often favor ductless mini-splits because of the layout.
District of Columbia state and utility programs
No dedicated District of Columbia state-administered heat pump rebate is currently tracked here. That's common. Most state-run programs live or die on annual funding, and the lack of a statewide line doesn't mean you're out of options. Three places to look:
- Your utility. Many utilities run their own heat pump rebates separate from anything the state does. The ENERGY STAR Rebate Finder takes your ZIP and lists what your specific utility offers right now.
- DSIRE for District of Columbia. The federally-funded DSIRE database for District of Columbia is the canonical list of every state, local, utility, and federal program, searchable and updated as programs change.
- Federal HEAR (income-qualified). The federal Home Electrification and Appliance Rebate program is administered by each state's energy office. If your household income is at or below 150% of area median, this is the largest single rebate you'll find. See the federal section below.
Before you spend any of that effort: run the tools first to check whether a heat pump even pencils for your home in this climate. The math comes before the paperwork.
Federal programs that still apply
- Section 25C Tax Credit (Tax credit (EXPIRED)): EXPIRED Dec 31, 2025. Repealed by the One Big Beautiful Bill Act (Public Law 119-21, July 4, 2025). Installations placed in service on or before Dec 31, 2025 may still claim on 2025 returns until Oct 15, 2026 extension deadline. 2026 installs are NOT eligible. IRS Energy Efficient Home Improvement Credit
- Home Electrification and Appliance Rebates (HEAR / HEEHRA) (Point-of-sale rebate): up to $8,000. Income-qualified households (≤150% area median income). 100% covered for ≤80% AMI, 50% for 80–150% AMI. State-administered with rollout varying widely. Some states (CA) fully reserved; others (HI, NH) launching mid-2026. US DOE Energy Saver Hub
- DSIRE Database (Aggregator): all state programs. Searchable database of every state, local, utility, and federal incentive currently active. Funded by US DOE, maintained by NC State University. Best starting point for verifying your specific ZIP code's options. dsireusa.org
Heads up: the federal Section 25C tax credit expired December 31, 2025. State and utility rebates are still active in most places.
Where to look next, for District of Columbia
- ENERGY STAR Rebate Finder: utility-specific rebates by ZIP.
- DSIRE database, filtered to District of Columbia: every active program in the state.
- Run the heat pump tools: payback, sizing, and whether the math actually works in mixed humid.
- Stack the Money: the national overview, with what stacks with what.