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REBATE GUIDE
Rebate Calculator

Montana Heat Pump Rebate Calculator

Estimate your Montana heat pump rebate range through NorthWestern Energy Efficiency Plus (E+). Use this guide to understand the key factors and check the official source for exact current amounts.

High confidenceLast checked: 2026-05-283 official sources
Rebate Range

How much is the Montana heat pump rebate?

NorthWestern Energy (NWE): $450 per unit for central heat pump (ducted or ductless ASHP). Must be ENERGY STAR rated OR meet SEER2 ≥15.2 AND HSPF2 ≥8.5. Applies to both new installations and replacements. NWE Form 3743 (effective August 1, 2025 – June 30, 2026). Licensed contractor installation required.

URGENT: Current rebate form (NWE Form 3743) expires June 30, 2026. Verify renewal and current program at northwesternenergy.com before purchasing.

NorthWestern Energy serves Billings, Helena, Missoula, Great Falls, Bozeman — approximately 65% of Montana residential customers.

Rocky Mountain Power (Wattsmart) serves portions of eastern Montana with different rates — see wattsmarthomes.com/wy/ for comparable amounts.

Per-unit rebate: $450 for each heat pump installed (one application per home for rebate purposes).

Montana's climate zone 6 requires cold-climate ASHP (HSPF2 ≥8.5) for year-round heating.

Not a guarantee of eligibility. Verify current amounts with your utility or NorthWestern Energy Efficiency Plus (E+).

Check NorthWestern Energy Efficiency Plus (E+) official site

Key factors that determine your Montana rebate

Your electric utility
Which utility serves your home (NorthWestern Energy (E+ Rebates), Rocky Mountain Power Wattsmart (eastern MT)) determines which rebate tier applies.
Current heating fuel
Oil and propane homes typically qualify for the highest tiers. Natural gas homes usually qualify for lower amounts.
Whole-home vs. partial scope
A whole-home heat pump installation that replaces all primary heating earns the highest rebate. Supplemental or mini-split-only installs earn less.
System size in tons
Larger systems generally earn higher rebates, up to the program cap. Oversizing can disqualify equipment in some programs.
Equipment certification
Equipment must meet the program's current efficiency threshold. Verify the AHRI reference number or program-specific certification before purchase.
Income qualification
Income-qualified households may receive enhanced rebates or additional assistance. Ask your utility about documentation requirements.
Working Reference

See a fully interactive rebate calculator

Heat pump rebate calculators show how fuel type, utility, and system size interact to affect rebate amounts. The same logic — fuel type, utility tier, system size, income — applies across programs including NorthWestern Energy Efficiency Plus (E+) in Montana.

View Montana HVAC rebates
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Official Sources
2026-05-28
2026-05-28
2026-05-28