New AC or Heat Pump in Missoula, MT: 2027 Installed Cost
Adjust your home size & electric cost in Missoula, MT
Start with the house: 2,200 sq. ft. calls for about 42,000 BTU, a 3.5-ton unit. In Missoula, the 14 SEER version of that system costs $7,640 to $9,210 installed and gives the lowest ten-year total of the ratings we price. No markup or discount here: Missoula (about 77,000 residents) follows the Montana statewide numbers.
This is the cost of swapping old equipment for new on the existing duct system. Anything structural, such as new runs, a bigger circuit or a rooftop mount, is extra.
Buying Central Air in Missoula: The Price Ladder
Spend $7,640 to $9,210 in Missoula and you get a 14 SEER system. Mid-range 16 SEER lands at $9,640 to $11,620. High-efficiency 18 SEER costs $15,590 to $18,800, and 20 SEER $21,000 to $25,310.
Price by Rating: Missoula and Statewide
| System (3.5 ton) | Missoula | Montana average | Materials |
|---|---|---|---|
| 14 SEER | $7,640 - $9,210 | $7,580 - $9,140 | $4,800 |
| 16 SEER | $9,640 - $11,620 | $9,560 - $11,530 | $5,990 |
| 18 SEER | $15,590 - $18,800 | $15,460 - $18,640 | $9,540 |
| 20 SEER | $21,000 - $25,310 | $20,820 - $25,100 | $12,760 |
Hardware for a 16 SEER system costs around $5,990. The gap between that and the installed Missoula price is the labor and overhead of doing the job right.
How Much the Missoula Market Adds or Saves
A contractor's costs follow the local economy: what the crew earns, what insurance costs and how long it takes to get to the job. For 16 SEER that means $9,640 to $11,620, unchanged from the statewide figure.
The same estimate covers all 7 ZIP codes with a Missoula mailing address in our database, in Missoula County. Ask each Missoula bidder for model numbers, warranty terms and a clear yes or no on permit, disposal and thermostat.
Electric Bills, Efficiency and Payback in Missoula
The electric rate behind these numbers is the Montana residential average, $0.177/kWh, about 19% below the national average of $0.217. Over the ten years in our data, Montana rates rose about 2.18% a year; at that pace the average would reach roughly $0.22/kWh by 2036.
Each line is one SEER rating; touch or hover a year to read its dollar figures. The climb is the 2.18% yearly increase MT rates showed over ten years.
Starting point: this summer at MT's current rate. From there the rate grows 2.18% per year, compounded, and each season cost is rounded up to $10.
Cooling this house with 16 SEER takes around 2,802 kWh per season, or about $500. The same summer on a 9 SEER unit costs about $880.
Upgrade Payback Finder: Your Old AC vs a New One
Set the two menus: the system in your house now and the one you are weighing. The math uses a 3.5-ton unit at Montana electric rates, $0.177/kWh and climbing 2.18% yearly.
| Installed price of the new system | $8,310 |
| Electricity saved, first year | $320 |
| Saved over 10 summers (rates rising) | $3,510 |
| Payback | 20.9 years |
| Net after 10 summers | -$4,800 |
Not on savings alone: 9 to 14 SEER is $4,800 short after 10 summers in MT.
Replacing a working unit: the whole install counts as the cost. If the old one has failed, weigh each rating against a 14 SEER quote instead.
Leaving a 9 SEER Unit Behind in Missoula
| 9 SEER | 14 SEER | 16 SEER | 18 SEER | 20 SEER | |
|---|---|---|---|---|---|
| Installation Cost | - | $8,310 | $10,480 | $16,950 | $22,820 |
| Electric Usage / Yr | 4,959 kWh | 3,161 kWh | 2,802 kWh | 2,522 kWh | 2,299 kWh |
| Electric Cost / Yr | $880 | $560 | $500 | $450 | $410 |
| Energy Savings / Yr | - | $320 | $390 | $440 | $470 |
| Payback (Rates Rising) | - | 20.9 years | 21.8 years | 28.7 years | 33.5 years |
| 10-Year Net (Rates Rising) | - | -$4,800 | -$6,280 | -$12,200 | -$17,640 |
Swapping a working 9 SEER unit for a 14 SEER system pays back in about 20.9 years in Missoula, counting the rate trend.
Total Cost to Own Each SEER in Missoula
Buy Price vs 10-Year Running Cost: Total Cost of Ownership in MT
For each SEER rating: the installed price, 10 years of cooling electricity at Montana rates (rising 2.18% a year), and the two added together. The shortest total bar is the cheapest system to own. Hover or tap a bar for the math.
After 10 years, 14 SEER is the cheapest system to own in Montana: $14,470 all-in ($8,310 installed + $6,170 of electricity).
How the electricity bar is built: this season at today's MT rate, then nine more seasons, each raised by the 2.18% yearly increase MT has averaged. Install is the typical price shown on this page. Every figure is rounded up to the next $10 separately, which can leave the parts $10 over the total.
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What Missoula Summers Ask of an Air Conditioner
Statewide numbers frame the Missoula estimate: region 1 on our map, summer highs averaging about 83°F, and winter highs around 31°F. Winter is the long season in Missoula. The AC works a few warm months, while the heating side runs for most of the year.
Climate zones run from 1 (cool) to 5 (hot); Montana is in Zone 1.
With little moisture to remove in Missoula, sizing can focus on peak afternoon heat.
Great Falls is the nearest guide city to Missoula, roughly 130 miles to the east.
Since heating carries most of the load here, spending more on the furnace or heat pump and keeping the AC at a standard rating often makes sense. Climate sets the baseline and the house sets the answer: a tight 2,200 sq. ft. home in Missoula may need less than 3.5 tons, a leaky or sun-heavy one more.
The House Decides the Install: Missoula
Leaky or undersized ducts can rob a new system of much of its rated efficiency, so their condition matters as much as the equipment. Fewer contractors work Missoula, so start collecting bids before the old system fails.
Each ductless head hangs high on an inside wall and connects through one narrow wall opening, so older houses avoid torn-up plaster.
When Missoula Installers Have Room
Furnace calls fill Missoula schedules all winter, so late spring and early fall suit cooling work best. A permit and inspection document that the Missoula install meets code, which helps when the house is sold.
Nearby Montana Markets
Compare Missoula with these Montana markets (16 SEER, installed):
- Billings, MT: $9,700 to $11,690, 270 mi east
- Great Falls, MT: $9,610 to $11,580, 130 mi east
- Bozeman, MT: $9,600 to $11,570, 160 mi southeast
Missoula contractors commonly work in Orchard Homes, Bonner-West Riverside, Frenchtown, Lolo and Florence, so quotes there tend to fall in a similar range.
More on SEER ratings, rate trends and payback across the state: Montana HVAC cost guide. Plug in your own home size and energy prices with the AC size calculator and the heat pump calculator.
Estimates are adjusted for Missoula; real quotes vary with your home, the equipment and the installer.
Quick Answers
Figures below use Montana averages; energy prices as of October 2026.
Does a heat pump heat for less than natural gas in Montana?
Not in Montana at today's prices. Natural gas delivers 97,881 BTUs per dollar and a COP-3 heat pump 57,997. Power would need to fall under about 10.5¢ per kWh for the heat pump to win (the Montana average is 17.7¢), or the unit would need a higher COP.
Is electricity in Montana expensive compared with other states?
Montana pays 17.7¢ per kWh on average: 19% under the national figure of 21.7¢ and the 16th cheapest of 51. Cooling bills rise and fall with it.
Is a cold-climate heat pump needed in Montana?
Yes, plan on one. Winter lows in Montana average about 11°F statewide, where a standard heat pump loses much of its output. Cold-climate models keep heating below zero; size for the coldest nights.
What does a heat pump save over electric baseboard in Montana?
Roughly two-thirds of the bill at COP 3. With the Montana average at 17.7¢ per kWh, baseboard heat costs about $51.73 per million BTU and a heat pump about $17.24.
What is the best season to replace an AC or furnace in Montana?
The shoulder seasons, spring and fall, ahead of need. Winter lows near 11°F statewide mean heating work should wrap up by early fall. The first heat wave and the first cold snap fill every installer's calendar; replacing on your own schedule leaves room to compare quotes.
Is it smart to replace the furnace and AC together?
When both are aging, generally yes: one visit, one labor charge, and a matched coil and condenser, which the efficiency rating assumes. If one is fairly new, price each job on its own.
Check it for your own home: Central AC cost estimator or Heat pump cost calculator.
More HVAC Cost Guides
Montana HVAC costs (statewide) · HVAC costs in every state
