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How Much Does HVAC Service Cost in Montana? (2026 Price Guide) Furnaces, Boilers, and Smoke Season

How much does HVAC service cost in Montana? 2026 rates for diagnostics, furnace and boiler repair, replacement pricing, smoke filtration, and hiring.

How Much Does HVAC Service Cost in Montana? (2026 Price Guide) Furnaces, Boilers, and Smoke Season

An HVAC service call in Montana opens with a diagnostic fee of $85 to $180 in 2026, and labor runs $95 to $175 an hour once the work starts. A seasonal furnace tune up costs $120 to $250. Repairs range from about $200 for an igniter to $1,800 for heat exchanger work, and full system replacements begin around $4,500.

Heating carries this market. A Montana furnace works from October into April, and a failure during a subzero week is a same day emergency rather than a scheduling question. Cooling has grown as a category over the past decade and still trails heating by a wide margin across most of the state.

Two forces shape the pricing more than anything else. Contractors here cover enormous territories, so the drive lands somewhere on your invoice. And smoke season has moved filtration from an upsell to a routine part of the conversation.

What You Pay Before Anything Gets Repaired

Diagnostic fees of $85 to $180 are close to universal, and most companies credit part or all of that toward the repair once you approve the work. Ask which policy a shop follows when you book, because on a $300 repair the difference is meaningful. A few companies waive the fee outright during their slow months.

Mileage is the Montana wrinkle. Shops based in Billings, Missoula, Bozeman, and Great Falls include a service radius of 25 to 40 miles, then bill $1 to $3 a mile or a flat zone fee past it. A place 60 miles out can carry $75 to $200 in travel before anyone opens a panel.

After hours rates run one and a half to two times standard, and during a cold snap nearly everything qualifies. Companies triage in that window, so a house with no heat moves ahead of a marginal cooling complaint. That order of operations is why a July AC problem gets a next week appointment and a February furnace failure gets a truck.

Road conditions stretch response times in ways no price list captures. When a county road drifts shut, the appointment moves no matter what you paid for priority. Homeowners well outside town usually keep a wood stove or a propane heater for exactly that gap.

Furnace Repairs and What Fails Here

Ignition components sit at the top of the repair list. A hot surface igniter replacement runs $250 to $500, a flame sensor cleaning or swap costs $150 to $350, and an inducer motor lands at $500 to $1,000. Those parts wear by cycle count, and Montana furnaces stack up cycles faster than furnaces in mild climates.

Blower motors come next at $500 to $1,200 for a standard motor and $800 to $1,600 for a variable speed ECM. Control boards run $450 to $900 installed, and gas valves fall between $400 and $900. Capacitors and pressure switches are the cheap ones at $150 to $400.

Heat exchanger cracks are the diagnosis nobody wants. Replacing an exchanger still under parts warranty costs $600 to $1,500 in labor, and out of warranty the job climbs to $1,500 to $3,000. On a furnace past 15 years, most Montana contractors point toward replacement instead, and that advice usually holds up.

Propane systems come with a second list of failure points. Regulators, two stage setups, and tank side problems belong to the propane supplier rather than the HVAC technician, and calling the right one saves a wasted diagnostic fee. A furnace that fires briefly and quits during a deep freeze often points at tank level or a frosted regulator.

Replacement Pricing for Montana Homes

Full replacement is the number most homeowners are chasing, and the honest answer turns on fuel type and how heat gets distributed. Installed pricing should include removal of the old equipment, permits where they apply, and startup with a combustion analysis. A quote missing those items is not a complete quote.

Sizing carries more weight here than in temperate states. Equipment sized for a design temperature of 20 below behaves differently than equipment sized for a mild winter, and an oversized furnace short cycles its way to an early death. A contractor who performs a load calculation rather than matching the tag on the old unit is worth paying more for.

Gas and Propane Furnaces

An 80 percent efficiency gas furnace installed runs $4,500 to $7,500 across most of Montana, and a 95 to 98 percent condensing unit costs $6,500 to $11,000. Condensing furnaces need PVC venting and a condensate drain, and in an unheated crawl space or garage that drain needs freeze protection. Missing that detail is a classic cause of a January no heat call.

Propane equipment costs the same as natural gas equipment plus a conversion kit at $150 to $400. Operating cost is where the two diverge, since propane pricing moves with delivery contracts and tank size. Homes outside gas service areas generally pay more per unit of heat, which shortens the payback period on high efficiency equipment.

Boilers and Hydronic Systems

Boiler replacement runs $7,000 to $16,000 installed depending on whether it feeds baseboard, cast iron radiators, or in floor tubing. Condensing modulating boilers sit at the top of that range and return real savings across a heating season this long. Older homes in Butte, Helena, and Great Falls still run cast iron systems worth keeping when the distribution side is sound.

Radiant floor heat shows up in newer Montana construction and in heated shops. Adding a zone costs $1,500 to $4,000, and a full radiant system in new construction runs $8 to $16 per square foot. Hydronic service takes a technician who works on boilers regularly, and not every HVAC shop in a small town does.

Cold Climate Heat Pumps

Cold climate heat pumps have become workable in Montana, with installed costs of $9,000 to $18,000 for a ducted system and $4,500 to $9,000 for a two or three head ductless setup. Current equipment holds usable capacity down near 5 below, which covers a large share of the heating season in the valleys. Below that point a backup heat source carries the house.

Dual fuel systems pair a heat pump with a gas or propane furnace and switch over at a set outdoor temperature. That configuration costs $12,000 to $22,000 installed and is what most Montana contractors recommend when a homeowner asks about heat pumps. It brings air conditioning along with it, which the old furnace never offered.

Smoke Season Made Filtration a Line Item

Wildfire smoke settles into Montana valleys for weeks at a stretch in late summer, and homeowners now ask about filtration the way they once asked about humidifiers. A media filter cabinet added to an existing furnace costs $400 to $900 and accepts four to five inch filters that a one inch slot cannot hold. Dollar for dollar it is the best indoor air spending available in this state.

Portable HEPA units handle a single room for $150 to $500 each, and running the furnace fan continuously pushes house air through the media filter for a few dollars a day. Whole house electronic air cleaners run $900 to $2,200 installed. Ask about pressure drop before buying any of it, since a filter that chokes airflow makes the furnace work harder and shortens its life.

Fresh air ventilation is the part that needs thought. An HRV or ERV brings outdoor air through a heat exchanger for $2,000 to $4,500 installed, which matters in a tight new build. During heavy smoke you close that intake, so the unit needs a damper and a control the homeowner can reach without a ladder.

Duct cleaning after a bad smoke year runs $400 to $900 for a typical house. Book it when there is visible debris or after remodeling, not on an annual schedule. Regular filter changes do more for the same money.

Maintenance, Cooling, and Mixed Heat Sources

A furnace tune up costs $120 to $250 and an AC tune up runs $110 to $220, with most companies bundling both into a maintenance plan at $180 to $400 a year. Plans usually include priority scheduling and 10 to 20 percent off repairs. In a state where January calls stack three deep, priority scheduling is the part that earns the money back.

Air conditioning keeps expanding across Montana as summers run hotter and smokier. Adding central AC to an existing furnace costs $4,500 to $8,500, and a single zone ductless unit runs $3,500 to $6,000. Houses that stay sealed through August need mechanical cooling in a way they did not 20 years ago.

Wood and pellet stoves complicate the picture in a useful way. Plenty of Montana homes burn wood as primary heat and hold the furnace in reserve, which means the furnace sits idle for months and then gets asked to perform on the coldest night. Service it before the season anyway, because idle equipment fails at startup.

Ductwork deserves attention in older houses. Sealing and insulating ducts that run through vented crawl spaces and unconditioned attics costs $1,000 to $3,500 and cuts a real share of the heating loss. Uninsulated duct under a Montana floor is heating the outdoors all winter.

Hiring and Verifying an HVAC Contractor

Montana does not run a statewide HVAC contractor license the way it does for plumbers and electricians, so verification takes a different path here. Start with the Secretary of State business registration, then confirm workers' compensation coverage or an independent contractor exemption through the Department of Labor and Industry. Ask for the liability insurance certificate to come straight from the carrier.

Refrigerant work is federally regulated regardless of state rules. Any technician handling refrigerant must hold EPA Section 608 certification, and a legitimate company produces it without hesitation. Gas piping and equipment replacement generally require a mechanical permit from the state Building Codes Bureau or your local jurisdiction, and fees add roughly $75 to $350.

Three written quotes on the same scope is the standard for anything past $3,000, each showing model numbers, efficiency ratings, the load calculation, permit costs, and both labor and manufacturer warranties. Comparing Montana heating and cooling contractors on identical scope is what exposes a thin bid. Our Montana home cost guides cover the rest of the seasonal maintenance calendar.

Frequently Asked Questions

How much does an HVAC service call cost in Montana?

The diagnostic fee runs $85 to $180 and labor bills $95 to $175 an hour after that, with most companies applying part of the diagnostic toward an approved repair. Rural addresses past a shop's service radius commonly add $1 to $3 a mile on top.

What does a new furnace cost in Montana?

An 80 percent efficiency gas furnace installed runs $4,500 to $7,500, and a 95 percent condensing unit costs $6,500 to $11,000. Propane adds $150 to $400 for a conversion kit, and pairing a heat pump with a furnace in a dual fuel setup pushes the project to $12,000 to $22,000.

When should I schedule a furnace tune up?

Late August through September is the window, before the first cold week fills every schedule in town. The visit runs $120 to $250, and booking during the off season often brings a lower price and a faster appointment.

Is air conditioning worth adding in Montana?

More homes add it each year, largely because smoke makes open windows a poor option in July and August. Central AC on an existing furnace costs $4,500 to $8,500, and a single zone ductless unit is the cheaper route at $3,500 to $6,000.