Open 24/7 for emergencies
A new propane furnace in Casanova runs $4,285 to $14,040 installed, keeping your AC. There’s no gas main out here, so it burns what’s in your tank.
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
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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 Casanova
For the Census, Casanova sits inside ZIP 20119, and across that ZIP not one owner home heats with utility gas while close to 3 in 10 heat with propane. So a gas furnace here means propane, fed from a tank on the property, and the replacement starts at the tank as much as at the furnace. New furnaces leave the factory set up for natural gas; ours get converted for propane, and the line and regulator get checked against the new furnace’s input before the burners ever light.
Heating season runs long this low in the Piedmont. At Warrenton 3 SE, the NOAA normals station a few miles west-northwest of the village, the median last spring freeze comes around April 9 and the first fall freeze around November 1, and close to 13 days a year never climb above freezing at all. Then there are mornings like January 27, 2026, when the weather station at Warrenton-Fauquier Airport, about five miles south, read 3 below zero with a wind chill of 14 below. A tired inducer motor or a cracked heat exchanger tends to give out on exactly that kind of morning.
The village itself is older than nearly everything around it. Casanova’s historic district, listed on the National Register in 2005, is mostly frame houses from roughly 1880 to 1910, and Fauquier County’s village plan notes ground that runs shallow to bedrock in places, enough to rule out a basement on some lots. So the furnace in a Casanova house may live in a crawlspace, a closet or an attic, and the new one has to come in through whatever hatch or doorway the old one used. That opening gets measured before the furnace gets priced.
Wind is the other winter hazard. The nor’easter of March 2, 2018 brought a wave of calls to Fauquier County 911, most of them for trees and wires down. A propane furnace needs electricity for its igniter, its controls and its blower, so a long outage leaves the house cold with a full tank. If you run a generator, say so when we quote, so the new furnace’s wiring is ready for it.
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
Casanova’s own ZIP, 20139, is post office boxes only, so the Census Bureau maps no area for it. These are ZIP 20119 as a whole, the Catlett ZIP area Casanova sits in.
When it’s time
A furnace that gets by in mild weather often fails on the coldest morning, when it runs longest and hardest. If yours has needed a part every winter, the $99 diagnostic visit tells you whether this one is still worth fixing or whether the money belongs in a new one.
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.
It’s the wall that keeps the burner’s exhaust out of the air the furnace blows through the house. Nobody patches one; a crack ends the repair conversation.
Permits, locally
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 new propane furnace has to be fed. Ask whether the quote checked the tank size, the regulator and the line from the tank against the new furnace’s input, and whether anything out there changes the price.
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.
We used Swifpro for a new hvac install and a plumbing repair. We felt the pricing for the hvac install was fair and offered a better product than their competitors. The techs were professional and timely.
Questions
Yes. Furnaces come built to blow up, down or sideways, so one can stand in a closet, lie flat in a crawlspace or sit in an attic. What limits the choice is the way in: the old furnace’s doorway or hatch sets the biggest cabinet that fits.
Yes. Fauquier County wants a permit for any fuel-fired appliance, propane included, even one going back in the same spot. With no town government in Casanova, the County’s Department of Community Development in Warrenton is the office. The HVAC replacement cost estimator gives your house its range.
$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 Casanova 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.