Furnace and AC replacement in Haymarket.
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.
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Twenty-year-old builder pairs in Dominion Valley, second systems in the Town.
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.
The systems across Haymarket, place by place.
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. |
Haymarket houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
The Town of Haymarket
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.
- Median home built1995 Census
- Built before 1980hardly any Census
- Built since 2000about 4 in 10 Census
- Most homes aresingle-family houses, about 6 in 10 Census
- Heated withgas, about 6 in 10 Census
- Rentedabout 1 in 10 Census
- Townhouse furnaces sit in closets and attics, so the path in matters as much as the size.
- Most homes here heat with gas, so the usual pair is a gas furnace inside and an air conditioner outside, with the coil sitting on the furnace.
The Prince William County side
ZIP 20169 as a whole: every Haymarket address, the Town’s homes included.
- Median home built2006 Census
- Built before 1980about 1 in 10 Census
- Built since 2000about 8 in 10 Census
- Most homes aresingle-family houses, about 7 in 10 Census
- Heated withgas, about 6 in 10 Census
- Rentedabout 1 in 10 Census
- A few homes still burn heating oil. We don’t work on oil burners, but a switch to a heat pump or a gas or propane furnace is ours to price.
- Many houses here still run the builder’s furnace and AC, and the two tend to wear out together.
What a new furnace and AC costs in Haymarket.
$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
- Furnace alone, keeping your AC$4,285 to $14,040
- Heat pump system instead$8,499 to $21,650
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.
When replacing both makes sense in Haymarket.
The basement is about to be finished
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.
Both halves went in with the house
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.
The AC died and the furnace is the same age
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.
Who signs off on a new system in Haymarket.
Town of Haymarket
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
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.
How to pick who replaces your furnace and AC in Haymarket.
Ask every company that quotes the job, us included.
Did they ask where the new outdoor unit will sit?
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.
Do they size it to the house, or copy the old label?
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.
Is the whole job in the written price?
Furnace, outdoor unit, matching coil, refrigerant lines, thermostat, permit and hauling the old one away. If it isn’t on the paper, ask.
Already holding another company’s quote?
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.
What our customers say.
Tyler from SwiftPro is very knowledgeable and professional on HVAC. Tech Edis and Rony are very professional and done good job to install AC
5.0 stars across 884 Google reviews. Read them on our reviews page.
Furnace and AC replacement questions from Haymarket.
Can a fence hide the new AC unit inside the Town of Haymarket?
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.
Does a new furnace and AC need a permit in Haymarket?
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.
How much does a new furnace and AC cost in Haymarket?
$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.
Do I have to replace both at the same time?
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.
More from SwiftPro in Haymarket.
More from SwiftPro in Haymarket
Start with your number, then a written quote.
Call, book online, 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 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 884 Google reviews. SwiftPro maintains a dedicated HVAC team and a dedicated plumbing team.
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