Heat Pump Cost in Idaho (2026)

At $0.78/therm and $0.13/kWh, Idaho has a rare combination: some of the cheapest gas and electricity in the country. A 2,000 sqft home burning 1,400 therms per winter at 90% AFUE spends about $1,092 on gas. The same home heated by a cold-climate heat pump uses roughly 13,000 kWh — about $1,690 at $0.13/kWh. The $598 annual gap is significant, but Idaho's cheap electricity means the gap is narrower than in states with higher rates. The gas advantage is real but not insurmountable — if you also need AC replacement, the avoided dual-system cost ($4,000-$8,000) can tip the math. For homes in the 27% electric heat share, upgrading from resistance to heat pump cuts bills by 50-60%, similar to other states.

Idaho's state incentive is a tax deduction — not a credit and not a rebate. A deduction reduces your taxable income, while a credit reduces your tax bill dollar-for-dollar. Under Idaho's 40% year-1 depreciation schedule, a $12,000 heat pump yields a $4,800 deduction the first year. At Idaho's marginal income tax rate of 5.8%, that's worth about $278 — far less than a 25% tax credit would be ($500 in Montana, for comparison). The 20% deductions in years 2-4 add another $417 total over three years. The full deduction over 4 years is worth roughly $695 — better than nothing, but substantially less valuable than a direct rebate or credit. This distinction is critical: don't misread 'tax deduction' as 'tax credit' and overestimate your savings by 4-5×.

Idaho's utility landscape splits along geographic and rate lines. Idaho Power serves the southern half — Boise, Nampa, Meridian, Twin Falls, and the Treasure Valley — at roughly $0.12-$0.14/kWh. This is the state's population center and the most developed contractor market. Rocky Mountain Power serves eastern Idaho (Idaho Falls, Pocatello, Rexburg) at similar rates. Avista Utilities serves the northern Panhandle (Coeur d'Alene, Sandpoint, Moscow) at slightly higher rates ($0.14-$0.16/kWh) and with more winter heating degree-days — the Panhandle's climate is closer to Spokane than Boise. Northern Idaho's colder winters and higher rates make the heat pump math marginally more favorable than in the south. Each utility has different net metering and interconnection rules.

Idaho's 12% propane share is concentrated in mountain communities (McCall, Sun Valley, Stanley), rural farmland, and areas beyond the gas distribution network. These homes pay $2.50-$3.00/gallon for delivered propane, and a heat pump at $0.13/kWh saves $1,000-$1,800/yr. The 27% electric heat share — higher than most cold states — represents a second opportunity: homes using electric resistance baseboards or forced-air electric furnaces can cut bills by 50-60% with a heat pump upgrade. In resort areas like Sun Valley and McCall, a heat pump also provides AC — previously unnecessary but increasingly valued as summer temperatures rise.

Idaho spans from zone 5 (cold) in the Snake River Plain to zone 7 (very-cold) in the Sawtooth and Bitterroot mountains. Boise's 99% design temperature is +6°F — mild enough that a standard HSPF 9 heat pump handles nearly all heating hours with minimal backup. Idaho Falls and Pocatello are at -5°F to -10°F, entering cold-climate heat pump territory. Sandpoint and the Panhandle see -10°F to -15°F, requiring HSPF 10+ and more backup hours. This intra-state variation means the heat pump specification and economics vary as much within Idaho as they do between different states. A Boise homeowner can use a less expensive, less extreme cold-climate unit; a Sandpoint homeowner needs the full cold-climate spec.