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Furnace and AC replacement in Haymarket runs $8,898 to $23,000 installed. The median 20169 owner home dates to 2006, so many builder systems are near twenty.
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 Haymarket
Haymarket mail covers about 9,500 homes, and the Census puts close to half of them in the years 2000 to 2009. Builders of that decade set the furnace and the air conditioner the same week, so in Dominion Valley and Piedmont the two halves share a birthday. An outdoor unit made before 2010 may still run on R-22, which nobody has produced since 2020, and a leak on one of those is often what forces the conversation about the furnace beside it.
The Town runs about a decade older, with a 1995 median and about six in ten homes from the 1980s and 90s; Longstreet Commons, a subdivision the Town dates to 1987, is typical. A house from those years is seldom on its first system, so the question is when the current pair went in. If both halves came from one install more than fifteen years ago, they belong on one quote.
Inside the town limits the outdoor unit’s spot is part of the job. The Town wants heating and AC units out of public view, and its guidelines spell out how: planting used as the screen has to screen all year, so a hedge that drops its leaves in November doesn’t count, and a fence is its own review: wood or wood-look picket, board or split rail, or wrought iron, other styles case by case, never exposed chain link.
About three homes in four across 20169 are single-family houses, and the larger 2000s ones often carry two systems, one for the main floors and one for the bedrooms, each priced on its own. Inside the town, close to four owner homes in ten heat with electricity; where yours has an air handler instead of a furnace, the matching swap is a heat pump system, $8,499 to $21,650 installed.
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 |
|---|---|---|---|---|
| Bull Run Mountain Estates | 1978 | single-family houses, nearly all | electricity, about 4 in 10 | Second or third systems, often on the original ductwork. |
| Haymarket | 1995 | single-family houses, about 6 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 only, about one in eighteen of the owner homes with Haymarket mail. Dominion Valley, Piedmont and Bull Run Mountain Estates sit outside it, in the county.
ZIP 20169 as a whole: every Haymarket address, the Town’s homes included.
When it’s time
Prince William County requires a permit to finish a basement, and a 2000s house that gains a finished lower level asks more of a system sized without it. If the furnace and AC are near twenty anyway, replacing them with the basement job lets the pair be sized for the house you’ll have.
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
The Town handed its building department to Prince William County on January 15, 2018. Every building and trade permit inside the town limits, mechanical and plumbing included, now comes from the County, and the Town’s own Zoning Approval has to be in hand before the County application goes in. Source.
The Town’s design guidelines ask that outdoor meters and mechanical, heating and air conditioning units be screened from public view by walls, fences, planting or a mix, and that roof-mounted equipment be screened on all sides. 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.
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.
Inside the town limits a new spot the street can see is a change for the Architectural Review Board. In Dominion Valley or Piedmont, Prince William County tells owners to check their association’s covenants before changing the outside of the house.
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.
Tyler from SwiftPro is very knowledgeable and professional on HVAC. Tech Edis and Rony are very professional and done good job to install AC
Where we work
Next door to Haymarket: Gainesville, Catharpin, Broad Run, The Plains and Aldie.
Questions
Yes. A fence is one of the screens the Town accepts, but fence applications also need the Planning Commission’s approval, on top of the Architectural Review Board’s. Keeping the new unit in the old one’s already screened spot is less paperwork.
The furnace does if it burns natural gas or propane: Prince William County requires a permit for that swap even in the same spot, and inside the town the Town’s Zoning Approval comes first. The HVAC replacement estimator gives your range.
$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 Haymarket 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.