Furnace and AC replacement in Warrenton.
Furnace and AC replacement in Warrenton runs $8,898 to $23,000 installed. The town’s median owner home went up in 1993; New Baltimore’s, in 1999.
- Your price range up front
- Sized to the house, not the old label
- Dedicated HVAC team
Get your new system priced
Two building waves around Warrenton, and the systems from both are coming due.
Half the owner homes inside the Town of Warrenton were built before 1993; in New Baltimore, out Lee Highway in 20187, the midpoint is 1999. The town added about 1,425 homes in the 1980s and 1990s and about 950 from 2000 to 2009. New Baltimore added about 1,000 in the 2000s and 760 more in the 2010s.
Set against how long equipment lasts, those numbers sort Warrenton’s systems into two piles. The 1980s and 1990s houses have had thirty-odd summers, so most are likely on a second furnace and air conditioner, some on a third, still pushing air through the original ducts. The 2000s houses are more likely still on the builder’s pair, closing in on twenty, and an outdoor unit from before 2010 may hold R-22, so read its label before paying for a big repair.
Townhouses are about a fifth of the homes in town, 874 by the Census count, usually with the furnace in a closet or the attic and the condenser on a pad out back. Close to four homes in ten in town are rented, and there the landlord decides between a repair and a new pair. Name the landlord when you book; the written price goes to them too.
In the Historic District the outdoor unit has its own rules. The Town’s guidelines call a ground unit on the front of a contributing building inappropriate, and want visible refrigerant lines painted or covered to match the wall. Even a like-for-like swap is an outside change on paper, which staff can approve; a new spot is likelier to reach the Architectural Review Board.
The systems across Warrenton, 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 |
|---|---|---|---|---|
| New Baltimore | 1999 | single-family houses, nearly all | gas, about 5 in 10 | 1980s and 90s houses, most on their second furnace and AC. |
| Warrenton | 1993 | single-family houses, about 5 in 10 | gas, about 6 in 10 | 1980s and 90s houses, most on their second furnace and AC. |
Warrenton houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
The Town of Warrenton
Inside the town limits, a little over 4 of the roughly 110 square miles the two Warrenton ZIP codes cover: the Historic District around Main Street, Leeds Square, and the streets off Broadview Avenue and Alwington Boulevard.
- Median home built1993 Census
- Built before 1980about 4 in 10 Census
- Built since 2000about 3 in 10 Census
- Most homes aresingle-family houses, about 5 in 10 Census
- Heated withgas, about 6 in 10 Census
- Rentedabout 4 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.
- 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 Fauquier County side
New Baltimore only. It’s the one Census place on the county side with mostly Warrenton mail, so the farms and lots beyond it aren’t in these figures.
- Median home built1999 Census
- Built before 1980about 3 in 10 Census
- Built since 2000about 5 in 10 Census
- Most homes aresingle-family houses, nearly all Census
- Heated withgas, about 5 in 10 Census
- Rentedabout 1 in 10 Census
- 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 Warrenton.
$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 Warrenton.
An attic system and a basement system from the same year
Plenty of two-story 2000s houses run one system for the main floors and one in the attic for the bedrooms, and in New Baltimore nearly every home is a single-family house. If both went in with the house, both are near twenty. Price them together and decide which goes first.
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 Warrenton.
Town of Warrenton
Inside the town limits, any work that alters a house’s plumbing, electrical or HVAC system is on the Town’s list of jobs that always need a permit. Source.
The Town lists replacing a gas furnace among the jobs that always need a Town permit. Source.
Inside the town limits, building permits and inspections come from the Town of Warrenton’s own Building office in its Department of Community Development, not from Fauquier County. Source.
Fauquier County
Fauquier County counts swapping an electric appliance for a similar one in the same spot as an ordinary repair that needs no permit. Moving an appliance to a new spot takes one. Source.
Fauquier County wants a permit for any fuel-fired appliance, so a gas or propane furnace replacement is permit work even in the same spot. Trade permits need no plans, and usually no zoning approval. Source.
How to pick who replaces your furnace and AC in Warrenton.
Ask every company that quotes the job, us included.
Did they measure the ducts in a house older than central air?
About one home in six in town is older than 1940. Ducts fitted into a house that age went wherever they could, and the new system has to suit what they carry. Ask to see the measurements behind the quoted size.
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.
Oscar and Ndung installed my HVAC system nice properly clean and they did a good job. I recommend swiftpro (Oscar and Ndung) to my friends and neighbors.
5.0 stars across 884 Google reviews. Read them on our reviews page.
Furnace and AC replacement questions from Warrenton.
My townhouse furnace is in the attic. Does that change the job?
It changes the furnace, not the range. An attic furnace lies on its side over a pan with its own drain line, and the new one has to come in through the same attic opening, so we measure that hatch before quoting. From there the coil and refrigerant lines run to the condenser out back.
Is a propane furnace and AC in New Baltimore priced from the same range?
Yes, $8,898 to $23,000 installed, size and efficiency set where yours lands. About one New Baltimore owner home in seven burns propane; the new furnace gets converted for it and leak tested. If the cooling half is the younger one, a furnace alone is $4,285 to $14,040.
How much does a new furnace and AC cost in Warrenton?
$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 Warrenton.
More from SwiftPro in Warrenton
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 Warrenton 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.