Furnace and AC replacement in Manassas.
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.
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Manassas built out in the 1980s and 90s, and those houses’ second systems are due.
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.
The systems across Manassas, 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 |
|---|---|---|---|---|
| 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. |
Manassas houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
The City of Manassas
The whole City sits in ZIP 20110. It runs its own water, sewer and electric service.
- Median home built1985 Census
- Built before 1980about 4 in 10 Census
- Built since 2000about 2 in 10 Census
- Most homes aresingle-family houses, about 4 in 10 Census
- Heated withelectricity, about 5 in 10 Census
- Rentedabout 3 in 10 Census
- Electric heat here usually means a heat pump with backup strips, which is priced as a heat pump system, not a furnace and AC.
The Prince William County side
Sudley and Bull Run in 20109, Yorkshire and most of Buckhall in 20111, Independent Hill in 20112, plus the county edges of 20110.
What a new furnace and AC costs in Manassas.
$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 Manassas.
Both halves are due, so the fuel is up for a decision
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.
Your heat may not be a furnace
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.
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 Manassas.
City of Manassas
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
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 Manassas.
Ask every company that quotes the job, us included.
Is the new outdoor unit going back on the old pad?
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.
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.
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Furnace and AC replacement questions from Manassas.
Who issues the permit for a new furnace and AC inside the City of Manassas?
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.
I own a Bull Run condo. Is the replacement mine to arrange?
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.
How much does a new furnace and AC cost in Manassas?
$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 Manassas.
More from SwiftPro in Manassas
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 Manassas 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.
SwiftPro Heating, Cooling & Plumbing, 4230 Lafayette Center Dr, Suite N, Chantilly, VA 20151, (703) 997-9757. Book online, read our reviews, or see every town we serve.