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Furnace and AC replacement in Dumfries runs $8,898 to $23,000 installed. Seven in ten Town homes date from 1970 to 1999, and their second pairs are aging out.
Price range
$8,898-$23,000
8yrs @ 7.99%
$126/mo
15yrs @ 9.99%
$96/mo
Monthly figures on the starting price, the whole price financed, on approved credit. The lender sets the final terms. How financing works
Get your price in writing
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5.0 stars across 1,132 reviews
One of our technicians with a new Trane outdoor unit he just installed beside a Northern Virginia house.
Licensed and insuredVirginia Class A contractor #2705192276
24/7 emergency serviceOften same-day, and we will tell you honestly when we can get there.
Our own HVAC installersA dedicated heating and cooling team, separate from our plumbers
Price in writing firstYou see every option priced before anything is ordered
What it costs
$8,898 to $23,000 installed for a furnace and air conditioner replaced together, 2 to 5 ton, from the same price book as our estimator. Where you land depends on the size of the house, the efficiency you pick, and what the ductwork and venting need.
Furnace and AC together, installed
$8,898 to $23,000
or $148/mo at 0% APR for 60 months
Furnace alone, keeping your AC
$4,285 to $14,040
or $71/mo at 0% APR for 60 months
Heat pump system instead
$8,499 to $21,650
or $142/mo at 0% APR for 60 months
Monthly figures: 60mo @ 0% APR on each starting price, the whole price financed, on approved credit. Longer plans lower the payment and cost more in total. The lender sets the final terms. How financing works
The HVAC replacement estimator gives your house its own number. Then we measure, and the price is in writing before anything is ordered.
Two years of labor come with every install. Monthly plans are on our financing page.
What’s different in Dumfries
The Dumfries address takes in three building booms. Inside the Town, seven homes in ten went up between 1970 and 1999, and the 1980s alone account for 582 of its 1,868; the median owner home dates to 1985. Montclair peaked in the same decade, with a third of its homes from the 1980s and a median of 1989. Cherry Hill came last, more than half of it built since 2000, median 2005.
Those dates set the replacement calendar. A 1980s house in the Town or Montclair is very likely on its second furnace and air conditioner, often put in together around the turn of the century and now old enough to fail together, most likely with R-22 in the outdoor half. In Cherry Hill the pair is more often the builder’s own, closing in on twenty: with seven owners in ten on gas, a furnace inside with the coil riding on top and the condenser out back.
The Town’s townhouse rows decide how the job gets in. Williamstown, Port O’Dumfries and South Cove, built 1974 through 1992, hold more than 850 homes, and a gas unit there usually keeps its furnace in a closet or the attic. The new furnace and coil travel the same stairs and opening the old ones did, and the outdoor unit has to fit the pad between the neighbors'.
Inside the town line the paperwork belongs to the Town. Its mechanical permit form lists furnace replacement and AC equipment replacement on separate lines, the AC line covering indoor, outdoor or both, and it goes to the Town’s own building department. Montclair, Southbridge and Cherry Hill are Prince William County’s.
Neighborhood by neighborhood
Census figures for the owner-occupied homes in each place, and what that usually means for a replacement.
| Place | Median home built | Most homes are | Heated with | What the system usually is |
|---|---|---|---|---|
| Montclair | 1989 | single-family houses, about 8 in 10 | electricity, about 5 in 10 | Mostly electric heat, so usually a heat pump swap instead. |
| Cherry Hill | 2005 | townhouses, about 4 in 10 | gas, about 7 in 10 | Townhouse systems: a furnace in a closet or attic, the air conditioner out back. |
| Dumfries | 1985 | townhouses, about 4 in 10 | electricity, about 5 in 10 | Mostly electric heat, so usually a heat pump swap instead. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
Nearly all of the Town sits in 22026, with a sliver in Triangle’s 22172. None of it is in 22025.
Montclair in 22025, where the Postal Service accepts Montclair as the town name; Southbridge and Cherry Hill in 22026, outside the town line.
ZIPs 22025 and 22026 as a whole: Montclair, Cherry Hill and the rest of Dumfries mail, the Town’s homes included.
When it’s time
Find the date on the furnace’s plate and the outdoor unit’s. In a 1980s Town or Montclair house, matching years from around 2000 to 2010 mean the second pair went in together; past fifteen, price both before one of them decides for you.
Where a lot of homes heat with electricity, the indoor half is often an air handler, and the like-for-like swap is a heat pump system, $8,499 to $21,650 installed.
Plenty of houses built since 2000 still run the builder’s furnace and AC. They wear out on about the same schedule, so when one goes, price the pair.
Permits and sign-offs
The Town of Dumfries enforces Virginia’s statewide building code through its own building department, and that code exempts swapping a home’s mechanical appliance only when it isn’t fueled by gas or oil. Inside the town limits, a gas or propane furnace or water heater replacement is permit work at Town Hall, not Prince William County. Source.
Prince William County lists any work that alters a home’s heating and air conditioning as permit work, but swapping an electric furnace, heat pump or air conditioning condensing unit for the same type of unit in the same spot is an ordinary repair that needs no permit. Source.
Prince William County requires a permit to replace a gas or propane furnace or a gas appliance such as a water heater, even like for like. Replacing an electric water heater with one the same size in the same spot needs no permit. Source.
Our Virginia Class A contractor license, 2705192276, is on the side of the van.
Choosing who installs it
Ask every company that quotes the job, us included.
New windows, more attic insulation, a finished lower level or an enclosed porch all change what a 1985 Dumfries house needs. Ask whether the size on the quote came from measuring the house as it stands now.
The old size is a guess somebody made years ago. Ask whether they measure the house and check the ductwork first. Too big short cycles; too small runs all afternoon in August.
Furnace, outdoor unit, matching coil, refrigerant lines, thermostat, permit and hauling the old one away. If it isn’t on the paper, ask.
Our free second opinion looks at the system you were quoted on and tells you what it actually needs, with our price if you want it.
Two of our crew going over a work order before the day's calls.
The system we put in first
Built to take a beating. Put in by our crew.
Heat lamps, snow and rain on one outdoor unit: that’s Trane’s own film. We’re a Trane Comfort Specialist, on Trane’s own dealer locator, and when you pick a Trane, our crew puts it in.
Films: Trane’s own.
From our Google reviews
5.0 stars across 1,132 reviews. Read them on our reviews page.
SwiftPro came today to install our new HVAC system and they were fantastic. They were super courteous and well organized and kept the whole place clean and tidy the entire time. The price was reasonable and the whole experience was amazing. Highly recommend them!
Where we work
Next door to Dumfries: Triangle, Quantico, Woodbridge, Lorton and Stafford.
Questions
If both are near twenty, usually yes: they went in as a matched set, and the coil sits on the furnace, so one now and the other next year opens that closet twice. If one was replaced recently, keep it. The HVAC replacement estimator prices the pair or either half.
It can, for what shows outside. The Town Code wants a certificate of appropriateness for changes in the historic district, and building permits there wait on it. Before a condenser moves or a new vent goes through a wall, ask the zoning administrator, who decides whether the job is minor or goes to the Architectural Review Board.
$8,898 to $23,000 installed for the pair, by size and efficiency. A furnace alone, keeping your AC, is $4,285 to $14,040. The HVAC replacement estimator gives your house its own number.
No. If the AC is young and only the furnace failed, replace the furnace. If they’re the same age, do both: a new outdoor unit needs a matched coil, and one built for the old refrigerant isn’t rated for the new one.
Ready when you are
Call, send the form at the top, or take the HVAC replacement estimator first. We measure before we quote, and if a repair makes more sense than a new system, you’ll hear that first.
SwiftPro Heating, Cooling & Plumbing
4230 Lafayette Center Dr N, Chantilly, VA 20151
44679 Endicott Dr, Suite 211, Ashburn, VA 20147
Virginia Class A contractor license #2705192276
SwiftPro Heating, Cooling & Plumbing is a licensed, BBB Accredited (A rating), independently owned heating, cooling and plumbing company in Chantilly, serving Dumfries and the rest of Northern Virginia. Virginia contractor license #2705192276. 5.0 stars across 1,132 reviews on Google, Angi, Yelp, the BBB and Facebook. SwiftPro maintains a dedicated HVAC team and a dedicated plumbing team.
From SwiftPro Heating, Cooling & Plumbing in Chantilly. Housing figures are the Census Bureau’s American Community Survey, 2020 to 2024, for each place named; permit, water and sewer facts link to each office’s own page and were checked in September and October 2026.