Open 24/7 for emergencies
In Haymarket, a new central AC on the furnace you keep is $5,942 to $14,450 installed. Town side or county side changes the rest.
Price range
$5,942-$14,450
8yrs @ 7.99%
$84/mo
15yrs @ 9.99%
$64/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 1,131 reviews
One of our HVAC technicians moving a new condenser up a driveway, the van behind him.
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
The same price book our estimator runs on, for a central air conditioner on its own, keeping the furnace you have. A single-stage unit on a small house sits near the bottom; a variable-speed one on a big house, near the top.
A central air conditioner alone, keeping your furnace, installed
$5,942 to $14,450
or $99/mo at 0% APR for 60 months
An air conditioner and furnace together, installed
$8,898 to $23,000
or $148/mo at 0% APR for 60 months
A heat pump in the AC’s place, installed
$8,499 to $21,650
or $142/mo at 0% APR for 60 months
Diagnostic visit, if it may be worth fixing
$99
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 cost estimator narrows it to your house. Then a tech measures, and you get the installed price in writing before anything is ordered.
With Comfort+ membership at $199 a year, the diagnostic visit is included, and half of each repair bill is banked toward replacing that system, up to $1,500.
What’s different in Haymarket
Most Haymarket mail is county-side subdivision built in one rush: of 9,509 homes in 20169, 48 percent went up from 2000 through 2009, and the median owner home dates to 2006. Gas heats 64 percent of owner homes, so a Dominion Valley or Piedmont house usually cools with a condenser out back feeding a coil on a gas furnace. EPA rules allowed R-22 only in equipment made before January 1, 2010, so an early builder unit may hold it.
The Town runs about a decade older. Inside the limits the median owner home is from 1995 and most homes date from the 1980s and 90s, so a typical house is on its second air conditioner, possibly one charged with R-22. Columbia Gas supplies the gas houses in town, about six in ten owners, and those are the AC-only jobs; the electric ones mostly run heat pumps, a separate replacement.
The town limits add two steps. The Town Council put all of Haymarket under historic district zoning in 1994, and its design guidelines want outdoor heating and air conditioning units screened from public view by a wall, a fence, planting or a mix. Keeping the new condenser behind the screen the old one had keeps that simple. A new spot the street can see goes to the Architectural Review Board for a Certificate of Appropriateness, and where a County permit is needed, the Town’s Zoning Approval comes first.
Dominion Valley and Piedmont’s bigger 2000s houses often add a bedroom-floor system with a condenser of its own. The two usually went in together, but one may have been replaced since, so each gets read and quoted on its own. Where there’s an association, the county itself tells owners to check their covenants before changing a house’s exterior, and a new condenser on the old pad changes the least.
Neighborhood by neighborhood
Census figures for the owner-occupied homes in each place, and what that usually means for the AC that’s there now.
| Place | Median home built | Most homes are | Heated with | The AC there now |
|---|---|---|---|---|
| Bull Run Mountain Estates | 1978 | single-family houses, nearly all | electricity, about 4 in 10 | A mix of heat pumps and gas furnaces with AC. |
| Haymarket | 1995 | single-family houses, about 6 in 10 | gas, about 6 in 10 | 1980s and 90s houses, many on their second air conditioner. |
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
Read the sticker on the outdoor unit. If it was made before January 1, 2010 and says R-22, each recharge is reclaimed refrigerant going into a unit near twenty. That’s the time to price a new AC for the gas furnace, before a July afternoon makes the call.
An air conditioner put in before 2010 most likely holds R-22, which hasn’t been made since 2020. A leak on one of those usually ends the repair road.
A house from the 2000s often cools with the condenser it was built with. Past fifteen years, compressors and fan motors start to go, one after another.
Permits, locally
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
Questions to ask anybody who quotes you, us included.
Inside the town limits, the fence or planting around the old condenser is there for the Town’s screening rule. A new unit can be a different size, so ask them to measure the screened space before ordering, and to say plainly if the new one won’t fit.
Ask how they picked the size. Copying the old nameplate repeats whatever was guessed when the house was built.
The outdoor unit and the coil on the furnace are rated as a pair. Ask whether the quote replaces both, and what happens to the line set.
A good company puts the repair price next to the replacement range and lets you choose. Already holding somebody’s big number? Take the free second opinion first.
Two of our crew going over a work order before the day's calls.
From our Google reviews
5.0 stars across 1,131 reviews. Read them on our reviews page.
They replaced my AC system and got it up and running with great service. Moises and Efrain are great!
Where we work
Next door to Haymarket: Gainesville, Catharpin, Broad Run, The Plains and Aldie.
Questions
Yes, and as dual fuel with your gas furnace it runs $8,499 to $21,650 installed. In town the gas company is Columbia Gas, so the Washington Gas dual fuel rebate isn’t open to you, and Columbia Gas’s rebate list has no heat pump. On the county side, check your gas bill first.
Prince William County, since the Town handed over its building department on January 15, 2018, and a like-for-like condenser trade sits on the county’s no-permit list. The Town keeps the look: a unit moved where the street can see it, or a change to its screen, goes to the Architectural Review Board.
$5,942 to $14,450 installed for a central air conditioner on its own, keeping the furnace you have; size and efficiency set where yours lands. An AC and furnace together run $8,898 to $23,000. The HVAC replacement cost estimator gives your house its own number.
It’s worth pricing. A heat pump cools exactly like an AC and also heats on mild days, so with your gas furnace it becomes dual fuel. A heat pump system runs $8,499 to $21,650 installed, and we’ll price it both ways.
Ready when you are
Call, or send the form at the top. A tech measures the house and puts the installed price in writing before anything is ordered, and if the old AC is worth fixing, 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 1,131 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.