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Furnace and AC replacement in Manassas runs $8,898 to $23,000 installed. Close to half the City’s homes went up in the 1980s and 90s, now on a second pair.
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 Manassas
The City of Manassas got its room to grow late. In the early 1970s the Town took in 5.7 square miles from the county, much of it undeveloped, became a city in 1975 and annexed the Godwin Drive area in 1984. The Census shows what followed: close to half the City’s homes went up between 1980 and 1999, and the typical owner’s house dates from 1985.
A house from those years has usually been through one furnace and air conditioner already, the originals pulled around the turn of the century, often together. The second pair is now about as old as the first one got. More of our Manassas visits are replacement estimates than in most towns we serve.
The City splits almost evenly on fuel. In its electric half the indoor unit is usually an air handler, so the like-for-like job is a heat pump system, $8,499 to $21,650 installed. In the gas half, and most of the county side, it’s a gas furnace with the cooling coil on top and an air conditioner out back: the pair this page prices.
On the county side the calendar varies. Sudley, median 1977 and close to half townhouses, is likely on its third pair. A 1995 house in Bull Run or Buckhall that still has its originals is thirty years in. Independent Hill, median 2000, is the newest: plenty of its houses still run the builder’s pair, and a two-story one often has two systems, each priced on its own line.
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 |
|---|---|---|---|---|
| City of Manassas | 1985 | single-family houses, about 4 in 10 | electricity, about 5 in 10 | Mostly electric heat, so usually a heat pump swap instead. |
| Buckhall | 1995 | single-family houses, about 8 in 10 | electricity, about 5 in 10 | 1980s and 90s houses, most on their second furnace and AC. |
| Sudley | 1977 | townhouses, about 4 in 10 | gas, about 6 in 10 | Townhouse systems: a furnace in a closet or attic, the air conditioner out back. |
| Independent Hill | 2000 | single-family houses, nearly all | gas, about 6 in 10 | Many still on the builder’s furnace and air conditioner. |
| Bull Run | 1995 | condo and apartment buildings, about 5 in 10 | gas, about 7 in 10 | Condo closet systems: small units, often with association rules for the outdoor half. |
| Yorkshire | 1984 | single-family houses, about 4 in 10 | gas, about 5 in 10 | 1980s and 90s houses, most on their second furnace and AC. |
| Loch Lomond | 1968 | single-family houses, nearly all | gas, about 7 in 10 | Second or third systems, often on the original ductwork. |
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
A repair never reopens gas versus electric. Replacing the whole system does. In the City, which sells its own power and where about half the owners already heat with electricity, the estimator prices a gas pair at $8,898 to $23,000 and a heat pump system at $8,499 to $21,650, side by side.
Where a lot of homes heat with electricity, the indoor half is often an air handler, and the like-for-like swap is a heat pump system, $8,499 to $21,650 installed.
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 City’s mechanical permit covers the first-time installation of heat pumps and central air conditioning, and the replacement of gas furnaces. Source.
The City lists gas clothes dryers, and replacing a gas dryer, furnace, stove or heater, as mechanical permit work. Source.
The City of Manassas issues its own building, mechanical, plumbing and gas permits; a Manassas address outside the city limits goes through Prince William County. Source.
The City’s memo to owners applying for permits strongly recommends that homeowners insist contractors secure their own permits, because the permit holder answers for code compliance, fees and violations. 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.
Ask before the price is final. On a historic lot downtown, the City’s design guidelines want outdoor HVAC equipment out of the way or screened by plantings or a fence. On the county side, Prince William’s permit page tells owners to check whether their HOA must approve changes to 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.
Excellent service and attention to detail. James was super thorough and explained everything to me. I highly recommend them for any plumbing needs
Hard working crew that removed old system and installed new system in a professional manner.
Where we work
Next door to Manassas: Bristow, Nokesville, Clifton, Centreville and Catharpin.
Questions
The City’s own office, and the furnace is what brings it in: its mechanical permit list names gas furnace replacement. An outdoor unit swapped by itself in a house, with no gas involved, is on the City’s no-permit list. Outside the city limits it’s Prince William County, which wants a permit for every gas furnace replacement.
Check the condo documents first. About half of Bull Run’s homes are in condo and apartment buildings, and two in three are rented. The association may own the roof or pad the outdoor unit sits on, and Prince William handles condo buildings as commercial projects for permits.
$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 Manassas 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.