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In Manassas, AC replacement costs $5,942 to $14,450 installed when the furnace isn’t part of it. Which Manassas you’re in sets the paperwork.
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 Manassas
A Manassas address can mean the City of Manassas, the City of Manassas Park or Prince William County. Each has its own permit office. Inside the City, swapping an outdoor unit that burns neither gas nor oil is on the no-permit list, while a first central air system in a house that never had one is mechanical permit work. The county skips the permit for the same type of condenser going back in the same spot. Manassas Park answers to its own building office.
The City splits almost evenly, about half its owner homes on gas and half on electricity, and in the electric half the unit outside is usually a heat pump, a different replacement. The gas half, and a little over half the county side, cool with a stand-alone air conditioner whose coil rides on the furnace. Loch Lomond is the most AC-only corner, about three owner homes in four on gas.
The City’s houses center on a 1985 median, and one that age has usually traded away its original condenser; if the second one went in before 2010, its refrigerant is likely R-22, whose production ended in 2020. On the county side the ages spread out: Sudley’s median is 1977, so its condensers are past their second round, while Independent Hill, median 2000, still has builder units getting old.
Inside the City, the electric company is the City, and its Load Management program puts a switch on an enrolled central air conditioner to cycle the compressor during summer peaks. If your old condenser carries one, ask the City what happens to the switch and your enrollment. Downtown, in the largest historic district, the guidelines want outdoor HVAC equipment somewhere unobtrusive or screened by plantings or a fence, so a condenser headed for a new spot there is a talk with City staff first.
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 |
|---|---|---|---|---|
| City of Manassas | 1985 | single-family houses, about 4 in 10 | electricity, about 5 in 10 | Mostly electric heat, so the cooling is usually a heat pump. |
| Buckhall | 1995 | single-family houses, about 8 in 10 | electricity, about 5 in 10 | A mix of heat pumps and gas furnaces with AC. |
| Sudley | 1977 | townhouses, about 4 in 10 | gas, about 6 in 10 | Townhouse condensers in tight side yards and on decks. |
| Independent Hill | 2000 | single-family houses, nearly all | gas, about 6 in 10 | Builder air conditioners, many now near twenty years old. |
| Bull Run | 1995 | condo and apartment buildings, about 5 in 10 | gas, about 7 in 10 | Condo and apartment buildings: compact condensers on shared pads and roofs. |
| Yorkshire | 1984 | single-family houses, about 4 in 10 | gas, about 5 in 10 | 1980s and 90s houses, many on their second air conditioner. |
| Loch Lomond | 1968 | single-family houses, nearly all | gas, about 7 in 10 | Gas furnaces with central air, often on the second or third AC. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
The whole City sits in ZIP 20110. It runs its own water, sewer and electric service.
Sudley and Bull Run in 20109, Yorkshire and most of Buckhall in 20111, Independent Hill in 20112, plus the county edges of 20110.
When it’s time
In a City house near the 1985 median, the condenser out back is often a turn-of-the-century replacement, now past twenty itself. If it’s leaking or the compressor is failing, get the new AC priced before the next summer peak does the deciding.
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.
It’s the pump at the heart of the outdoor unit and its costliest part. Out of warranty on an older unit, the repair can come close to half the price of a new AC, the point where Goodman says replacing may be the better money.
Permits, locally
The City’s mechanical permit covers the first-time installation of heat pumps and central air conditioning, and the replacement of gas furnaces. 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.
The City, Manassas Park and the county each run their own building office, and the rules differ. The City also strongly recommends that homeowners insist contractors secure their own permits, since the permit holder answers for the work. A company that asks your jurisdiction first is reading the right rulebook.
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.
Excellent service and attention to detail. James was super thorough and explained everything to me. I highly recommend them for any plumbing needs
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 Manassas: Bristow, Nokesville, Clifton, Centreville and Catharpin.
Questions
Your landlord’s. Virginia’s landlord and tenant act has the landlord keep heating, ventilating and air-conditioning facilities in good and safe working order, and close to three in ten City homes are rented. Tell the landlord; if they book us, the quote goes to them, and the $99 diagnostic settles repair or replace.
Close, but the City treats it differently: a first-time central air install is mechanical permit work there, where replacing an electric unit isn’t. If your gas furnace already moves air through ducts, the new coil sits on it like any AC; if the house has no ducts, those come first.
$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 Manassas 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.