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Furnace and AC replacement in Warrenton runs $8,898 to $23,000 installed. The town’s median owner home went up in 1993; New Baltimore’s, in 1999.
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 Warrenton
Half the owner homes inside the Town of Warrenton were built before 1993; in New Baltimore, out Lee Highway in 20187, the midpoint is 1999. The town added about 1,425 homes in the 1980s and 1990s and about 950 from 2000 to 2009. New Baltimore added about 1,000 in the 2000s and 760 more in the 2010s.
Set against how long equipment lasts, those numbers sort Warrenton’s systems into two piles. The 1980s and 1990s houses have had thirty-odd summers, so most are likely on a second furnace and air conditioner, some on a third, still pushing air through the original ducts. The 2000s houses are more likely still on the builder’s pair, closing in on twenty, and an outdoor unit from before 2010 may hold R-22, so read its label before paying for a big repair.
Townhouses are about a fifth of the homes in town, 874 by the Census count, usually with the furnace in a closet or the attic and the condenser on a pad out back. Close to four homes in ten in town are rented, and there the landlord decides between a repair and a new pair. Name the landlord when you book; the written price goes to them too.
In the Historic District the outdoor unit has its own rules. The Town’s guidelines call a ground unit on the front of a contributing building inappropriate, and want visible refrigerant lines painted or covered to match the wall. Even a like-for-like swap is an outside change on paper, which staff can approve; a new spot is likelier to reach the Architectural Review Board.
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 |
|---|---|---|---|---|
| New Baltimore | 1999 | single-family houses, nearly all | gas, about 5 in 10 | 1980s and 90s houses, most on their second furnace and AC. |
| Warrenton | 1993 | single-family houses, about 5 in 10 | gas, about 6 in 10 | 1980s and 90s houses, most on their second furnace and AC. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
Inside the town limits, a little over 4 of the roughly 110 square miles the two Warrenton ZIP codes cover: the Historic District around Main Street, Leeds Square, and the streets off Broadview Avenue and Alwington Boulevard.
New Baltimore only. It’s the one Census place on the county side with mostly Warrenton mail, so the farms and lots beyond it aren’t in these figures.
When it’s time
Plenty of two-story 2000s houses run one system for the main floors and one in the attic for the bedrooms, and in New Baltimore nearly every home is a single-family house. If both went in with the house, both are near twenty. Price them together and decide which goes first.
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.
A new outdoor unit needs a matching coil, and on a gas system the coil sits on the furnace. If the furnace is as old, do both and open that closet once.
Permits and sign-offs
Inside the town limits, any work that alters a house’s plumbing, electrical or HVAC system is on the Town’s list of jobs that always need a permit. Source.
The Town lists replacing a gas furnace among the jobs that always need a Town permit. Source.
Inside the town limits, building permits and inspections come from the Town of Warrenton’s own Building office in its Department of Community Development, not from Fauquier County. Source.
Fauquier County counts swapping an electric appliance for a similar one in the same spot as an ordinary repair that needs no permit. Moving an appliance to a new spot takes one. Source.
Fauquier County wants a permit for any fuel-fired appliance, so a gas or propane furnace replacement is permit work even in the same spot. Trade permits need no plans, and usually no zoning approval. 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.
About one home in six in town is older than 1940. Ducts fitted into a house that age went wherever they could, and the new system has to suit what they carry. Ask to see the measurements behind the quoted size.
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.
Oscar and Ndung installed my HVAC system nice properly clean and they did a good job. I recommend swiftpro (Oscar and Ndung) to my friends and neighbors.
Questions
It changes the furnace, not the range. An attic furnace lies on its side over a pan with its own drain line, and the new one has to come in through the same attic opening, so we measure that hatch before quoting. From there the coil and refrigerant lines run to the condenser out back.
Yes, $8,898 to $23,000 installed, size and efficiency set where yours lands. About one New Baltimore owner home in seven burns propane; the new furnace gets converted for it and leak tested. If the cooling half is the younger one, a furnace alone is $4,285 to $14,040.
$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 Warrenton 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.