Open 24/7 for emergencies
A new gas or propane furnace in Warrenton runs $4,285 to $14,040 installed, keeping the AC you have. In town, six owner homes in ten burn natural gas.
Price range
$4,285-$14,040
8yrs @ 7.99%
$61/mo
15yrs @ 9.99%
$46/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
Send this and the office calls or texts you back to set a time.
We’ll call or text this number about your request. By sending it you agree to our terms and privacy policy.
Rather talk now? (703) 997-9757
5.0 stars across 1,132 reviews
Two of our heating technicians beside a gas furnace, the cooling coil on top of it and the water heater to the right.
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 gas furnace on its own, 2 to 5 tons, keeping the air conditioner you have. A single-stage furnace in a small house sits near the bottom; a modulating one in a big house, near the top.
A gas furnace alone, keeping your air conditioner, installed
$4,285 to $14,040
or $71/mo at 0% APR for 60 months
A furnace and air conditioner together, installed
$8,898 to $23,000
or $148/mo at 0% APR for 60 months
Repair 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, at no charge, before anything is ordered.
Natural gas or propane, in a house, a townhouse or a condo, we replace them all. Oil furnaces we don’t.
What’s different in Warrenton
Inside the Town of Warrenton, 1,525 of the 2,509 owner homes heat with natural gas, and the town sits in Columbia Gas of Virginia’s service area. About one home in six in town went up before 1940, and the Town’s Historic District guidelines put its biggest concentration of houses along Winchester, Waterloo, Culpeper, Lee and Falmouth Streets. The 2000s were its busiest decade, about 950 homes.
A furnace alone is the right call when the air conditioner on it is clearly younger; the outdoor half lives in the weather and often goes first. The coil rests on the furnace cabinet, so the new furnace has to match its width and the airflow the coil was built for. If the two dates sit within a few years, price the pair too: $8,898 to $23,000 installed, opening the closet once.
In New Baltimore, which takes in Vint Hill, 534 owner homes burn propane from a yard tank, about one in seven. Most new furnaces ship set up for natural gas, so for propane one gets converted and the connection leak tested before it’s lit.
Where the old furnace shared a masonry chimney with a gas water heater, a wall-vented replacement leaves that flue to the water heater by itself, and it may need a liner sized to match. Repairs to a masonry chimney, its flue or its liner are on the Town’s always-permit list too, so get the liner priced or ruled out in writing.
Neighborhood by neighborhood
Census figures for the owner-occupied homes in each place, and what that usually means for the furnace that’s there now.
| Place | Median home built | Most homes are | Heated with | The furnace there now |
|---|---|---|---|---|
| New Baltimore | 1999 | single-family houses, nearly all | gas, about 5 in 10 | 1980s and 90s houses, many on their second furnace. |
| Warrenton | 1993 | single-family houses, about 5 in 10 | gas, about 6 in 10 | 1980s and 90s houses, many on their second furnace. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
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.
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.
When it’s time
A high-efficiency furnace vents out a side wall in plastic pipe, not up the chimney. In the Historic District a new hole in an outside wall goes through the Town’s Certificate of Appropriateness process, and the guidelines call taking down a historic chimney inappropriate even once nothing uses it. Settle the vent route first.
A house from the 2000s often runs the furnace it was built with. Around twenty years, inducer motors and control boards start to go, one after another.
We replace propane furnaces as well as natural gas ones. The new furnace is set up for propane before it’s lit, and the quote is written for your house.
Permits, locally
The Town lists replacing a gas furnace among the jobs that always need a Town permit. 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.
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.
A wall-vented furnace needs an exit clear of windows, doors and the gas meter, and in the Historic District one the Town can approve. Ask to see it marked before you sign.
Ask how they picked the size. Copying the old nameplate repeats whatever was guessed when the house was built.
A new furnace has to work with the coil and the outdoor unit already there. Ask whether they looked at both before quoting a furnace on its own.
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 1,132 reviews. Read them on our reviews page.
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.
Questions
Columbia Gas of Virginia’s WarmWise program pays its residential customers a rebate on a natural gas furnace rated 90 percent AFUE or better, in an existing house heated mainly by gas. Funding is capped and first come, first served, so check the current terms before choosing a model.
Price both. Close to three New Baltimore owners in ten already heat with electricity, and a heat pump backed by your propane furnace is the middle road. The HVAC replacement cost estimator gives a range for each; a furnace that may still be worth fixing gets a $99 diagnostic visit.
$4,285 to $14,040 installed for a gas furnace on its own, keeping the air conditioner you have; size and efficiency set where yours lands. A furnace and air conditioner together run $8,898 to $23,000. The HVAC replacement cost estimator gives your house its own number.
Fix the small parts on almost any furnace. Past fifteen years, with a repair over a third of the price of a new one, replacing usually wins. Not sure which you’re looking at? The diagnostic visit is $99, and the tech prices the repair before starting it.
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 furnace 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 Warrenton 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.