New electric furnace + new AC
- Installed
- $10,900$7,900–$14,100
- Energy per year
- $1,030Baseline
- 15-year total
- $26,300
- Payback
- Baseline
Heat pump or new furnace and AC? For Hawaiian Electric (Oahu) customers
For Hawaiian Electric (Oahu) customers in Hawaii, on the utility's current tariff, local weather.
Quick answer · updated
As of November 2026, for a typical 1,800 sq ft electrically heated home on Hawaiian Electric (Oahu) electricity rates in Hawaii that needs a new furnace and AC: It depends on your quotes. A high-efficiency cold-climate heat pump saves about $390 a year to run, so it comes out ahead over 15 years if its quote is no more than $5,900 above the quote for a new furnace and AC.
Electricity
38.2¢/kWh
-14% vs. Hawaii average
Heating fuel
Electric
Most homes here heat with electricity (46%)
Climate
12
heating degree days · Upper Wahiawa 874.3
Rebates
Not checked
not yet researched in Hawaii
Our estimate for this home
It depends on your quotes
It depends on your quotes. A high-efficiency cold-climate heat pump saves about $390 a year to run, so it comes out ahead over 15 years if its quote is no more than $5,900 above the quote for a new furnace and AC.
Total cost over 15 years
Installed cost plus energy, year by year. Hover or tap the chart to compare.
- New electric furnace + new AC
- Heat pump (replaces both)
- High-efficiency cold-climate heat pump
Show as a table
| Option | Installed cost (typical, range, after rebates) | Energy cost per year | 15-year total | Payback vs. like-for-like |
|---|---|---|---|---|
| New electric furnace + new AC | $10,900 $7,900–$14,100 |
$1,030 |
$26,300 | Baseline |
| Heat pump (replaces both) | $11,900 $8,300–$15,500 |
$900 saves $130/yr |
$25,400 | 7.9 years |
| High-efficiency cold-climate heat pump Lowest 15-year cost | $15,500 $11,400–$20,700 |
$640 saves $390/yr |
$25,100 | 11.8 years |
What this is based on
- Electricity: SCHEDULE R RESIDENTIAL SERVICE - Single Phase tariff for Hawaiian Electric (Oahu), effective 2026-03-01, from the U.S. Utility Rate Database, applied tier by tier to the extra kWh.
- Weather: Upper Wahiawa 874.3 (12 heating and 2,522 cooling degree days a year, 1991-2020).
- Heating fuel prices (EIA): gas $5.40/therm (Hawaii, average of the last five winter months); propane $2.69/gallon (U.S. average this heating season); heating oil $6.15/gallon (U.S. average this heating season).
- Homes in Hawaiian Electric (Oahu)'s Hawaii area heat with electricity 46%, gas 4%, propane 1% (U.S. Census Bureau, American Community Survey 2019-2023). The calculator starts with electricity; pick yours above.
- Hawaii HVAC installer wages are 7% above the U.S. median (BLS), so installed prices are scaled by 1.04.
- Energy use for heating and cooling:
- New electric furnace + new AC: 2,766 kWh a year for heating and cooling
- Heat pump (replaces both): 2,418 kWh a year for heating and cooling
- High-efficiency cold-climate heat pump: 1,711 kWh a year for heating and cooling
Rebates
- We haven't checked heat pump rebates in Hawaii yet, so these numbers leave them out. Utility and state programs can take thousands off a heat pump: ask Hawaiian Electric (Oahu) and your contractor what's available. Each dollar of rebate adds a dollar to the quote gap a heat pump can carry.
How Hawaiian Electric (Oahu)'s rates change the answer
Hawaiian Electric (Oahu)'s electricity price for a typical home is 14% below the Hawaii average ($0.382 vs. $0.444 per kWh). A heat pump moves your heating from gas, propane or oil to electricity, so the electricity price is the biggest single factor: calculators that use a state average can get the answer wrong for your utility. At these prices, a heat pump is cheaper to run than an electric furnace for a typical home here.
Common questions
Is a heat pump worth it for Hawaiian Electric (Oahu) customers?
It depends on your quotes. A high-efficiency cold-climate heat pump saves about $390 a year to run, so it comes out ahead over 15 years if its quote is no more than $5,900 above the quote for a new furnace and AC. This is for a typical 1,800 sq ft home with average insulation that heats with electricity and needs both a new furnace and AC; change the details in the calculator above for your home.
How much does a heat pump cost to run on Hawaiian Electric (Oahu)'s rates?
About $640 a year for heating and cooling with a high-efficiency cold-climate heat pump (1,711 kWh), compared with about $1,030 a year for a new furnace and AC, for a typical 1,800 sq ft home with weather like Upper Wahiawa 874.3's.
How much does a heat pump cost to install in Hawaii?
Our typical installed price for a high-efficiency cold-climate heat pump in Hawaii is about $15,540 (range $11,396 to $20,720), against about $10,878 for a new furnace and AC. Prices are published study ranges scaled for home size and Hawaii installer wages; rebates in Hawaii have not been checked yet, so they are not included. Always compare real quotes.
What electricity price does this use?
Electricity: SCHEDULE R RESIDENTIAL SERVICE - Single Phase tariff for Hawaiian Electric (Oahu), effective 2026-03-01, from the U.S. Utility Rate Database, applied tier by tier to the extra kWh.
How we calculate this
Heating and cooling need
Your home's yearly heating and cooling need comes from 1991-2020 NOAA climate normals for the nearest weather station, scaled by floor area and insulation level. If you know last winter's gas use, compare it with the therms in the energy-use list above.
Heating fuels
Choose the fuel your furnace burns: gas, propane, heating oil or electricity. Gas uses the state's average residential price over the last five winter months; propane and heating oil use the U.S. Energy Information Administration's weekly residential prices for this heating season (state, regional or U.S. average, as available), converted by heat content (91,500 Btu per gallon of propane, 138,500 per gallon of oil). An electric furnace is priced through the same electricity rates as the heat pump. The starting fuel is the most common furnace fuel in the utility's area (U.S. Census Bureau, American Community Survey).
Equipment efficiency
New gas or propane furnace 95% AFUE, new oil furnace 85%, electric furnace 100%; new AC SEER2 13.4; standard heat pump SEER2 15.2 / HSPF2 7.8; high-efficiency cold-climate heat pump SEER2 21.5 / HSPF2 10.6. Heat pump efficiency falls as it gets colder, and in cold months part of the heat comes from backup electric strips (or your old furnace, if you keep it). Existing equipment is assumed to be 15-20 years old: an 80% gas or propane furnace, a 78% oil furnace or a SEER2 9.5 AC.
Installed costs
Installed prices vary a lot, so we show a typical price and a range for a home of about 1,800 sq ft with existing ductwork, scaled for larger or smaller homes: furnace and AC together $9,000–$14,000; furnace alone $3,800–$7,000; AC alone $4,500–$9,000; standard heat pump $8,000–$15,000; high-efficiency cold-climate heat pump $11,000–$20,000; electrical panel upgrade, if needed, $1,500–$4,000. These are national figures drawn from published studies and program data (NESCAUM / Energy Solutions, Heat Pumps in the Northeast and Mid-Atlantic: Costs and Market Trends (October 2024); Rewiring America, Upfront cost of home electrification (March 2024); EIA, Updated Buildings Sector Appliance and Equipment Costs and Efficiencies (2023)). The most useful number here is how much more a heat pump can cost than a like-for-like quote and still come out ahead: get quotes for both and compare.
Labor and rebates
Half of each installed price is treated as labor and scaled by the state's median HVAC installer wage relative to the U.S. median (U.S. Bureau of Labor Statistics). Listed rebates are subtracted when the box is ticked; per-ton rebates assume about one ton of capacity per 600 sq ft. Rebates change often and have eligibility rules, so confirm with the program before you buy.
Not included
Financing, maintenance (similar for all options), local town rebates, and changes in energy prices over time.