A new central air system in Missoula typically lands between $5,500 and $12,000 installed, with most homeowners landing near $7,000 to $8,500 for a standard 2,000 square foot home on existing ductwork.
Ductless mini splits, popular in older Missoula neighborhoods without ductwork like the University District and Rattlesnake, run $3,200 to $9,500 depending on how many zones you need cooled.
Your final number depends on three things
Unit size (measured in tons), SEER2 efficiency rating, and whether your home already has usable ductwork. Homes without ducts, common in older Missoula homes, often do better with mini splits than a full central retrofit.
How Missoula Pricing Varies From the National Average
Montana labor markets, permit requirements through the City of Missoula, and our short but intense cooling season all shape local pricing.
Unlike a place like Dallas, your AC unit in western Montana isn’t running nonstop for six months. It’s working hard during a shorter, sharper window, often stacked right on top of wildfire smoke season when you need clean, cooled air the most.
That changes what “worth it” looks like here.
Nationally, nine SEER2 rated systems installed with existing ductwork average $5,000 to $8,000 for mid efficiency equipment, according to 2026 pricing data from HVAC Project Cost.
Premium high efficiency units in larger homes can reach $9,000 to $13,500. Missoula homeowners tend to fall on the lower to middle end of that range because most of our homes are under 2,500 square feet.
What’s Driving Your Number Up or Down
- Ductwork condition. Good bones save you thousands. Damaged or undersized ducts can add $1,500 to $4,000 to a project.
- Electrical panel age. Homes running on older 60 or 100 amp service sometimes need a panel upgrade before installation, adding $1,500 to $4,000.
- System type. Central air, ductless mini split, or heat pump each carry different equipment and labor costs. Heat pumps, which both heat and cool, run $500 to $3,000 more than a straight cooling system but can replace part of your furnace’s workload too.
- Access and layout. Crawl spaces, tight attics, and multi story homes can add labor hours.
A Local’s Take
Here’s a review form a Missoula homeowner pulled straight from our Google Business Profile:
“…I have had them service my furnace and replace an old central AC unit this spring. Their employees are courteous, respectful and always show up when they promise…“
What Right Now Plumbing and Heating Does Differently
We serve Missoula, Lolo, Frenchtown, East Missoula, Bonner, Clinton, and Wye with upfront pricing from a licensed AC tech.
We walk your home, whether its in Linda Vista, Miller Creek, East Missoula, South Hills, etc. It doesn’t matter, we’ll come out to you and measure your square footage, check your ductwork or lack of it, and give you a free quote.
Frequently Asked Questions
How long does an AC installation take in Missoula?
Most standard installs with existing ductwork take four to eight hours and finish in a single day.
Do I need a permit to install central air in Missoula?
Yes, the City of Missoula requires a mechanical permit, and a licensed contractor should pull it for you.
Is a ductless mini split cheaper than central air?
Often yes for homes without existing ducts, since adding ductwork can cost $5,000 to $15,000 more than a mini split installation alone.
What size AC unit do I need for my Missoula home?
Most 2,000 square foot homes need a 2.5 to 3 ton unit, though our climate often allows for a slightly smaller system than hotter places require.
Can I install just an AC unit without replacing my furnace?
Usually yes, as long as your existing furnace and air handler are compatible with the new system’s coil and refrigerant type.
Does a heat pump replace the need for a furnace in Montana?
Not typically as your sole heat source here. Most Missoula homes pair a heat pump with a backup furnace for the cold stretches of winter.
Written by the owner of Right Now Plumbing and Heating.
Sources
Fixr.com 2026 AC Installation Cost Guide, HVAC Project Cost 2026 Central Air Installation Report, U.S. Department of Energy residential energy use data, Right Now Plumbing and Heating Google Business Profile reviews.