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Swapping both the furnace and the AC at a Catlett house runs $8,898 to $23,000 installed. Cedar Run and a long winter decide the details.
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 Catlett
ZIP 20119 covers every Catlett address, the village included, and the Census counts 1,040 owner homes in it, all detached, with a median build year of 1990. About 180 homes there predate 1940, some in the old railroad village, and about 470 went up in the 1990s and 2000s. A furnace and air conditioner put in with a 1999 house are twenty-seven years old now; even in the quarter built since 2000, the oldest pairs are twenty-six. The builder’s pair has reached the age where a repair bill and a replacement quote start to look alike.
The Census finds no owner home in 20119 on utility gas. Among the 1,040, 526 heat with electricity, and a heat pump system, $8,499 to $21,650, is the swap that fits them. Propane heats 301, the furnace-and-AC pairing, with $4,285 to $14,040 covering a furnace alone while the air conditioner stays. Another 131 list wood or some other fuel. About one in sixteen burns oil; burners aren’t our work, but pricing the move off oil, to a heat pump or a propane furnace, is.
Cedar Run sets the local risk. On the Weather Service’s scale for the Catlett gauge, 15 feet is minor flooding, with water at the low spot on Flatwood Lane; at 21 feet the Route 806 bridge floods and water reaches buildings nearby. The gauge crested at 18.2 feet on July 12, 2013, the day flash flooding closed roads in Catlett, and passed 15 feet again in April 2014 and July 2025. On ground this flat, with floodplain around the village by the County’s account, the floor a furnace or air handler stands on is part of the quote.
Wind finds the outdoor half. On August 13, 2021, gusts estimated at 75 mph brought down numerous trees on Old Dumfries Road, about two miles northwest of the village, and the March 2018 nor’easter kept Fauquier County’s 911 center busy with trees and wires. A propane furnace’s igniter and blower still need power, so a new one rides out an outage no better than the old one. Put the new outdoor unit clear of big limbs, off the low spots in the yard, on a pad that keeps its base above standing water.
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
ZIP 20119 as a whole: every Catlett address, the village included. The Census place for the village alone has too few homes for steady figures.
When it’s time
A tide mark or rust at the foot of a furnace says water stood against it. Furnace makers' manuals say not to run one that has been under water, and the gas valve and control board are the parts in question. If that furnace is as old as the outdoor unit, replacing the pair is worth pricing next to repairing the wet one.
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 label on its side names the refrigerant. R-22 hasn’t been made or imported in the US since 2020, so a leak gets expensive. Replace it on your schedule, not in July.
Permits and sign-offs
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.
Outside the town limits, Fauquier County issues the permit. It wants one for any fuel-fired water heater, propane included, and for any heater being moved; an electric one swapped for a similar unit in the same spot counts as an ordinary repair. Trade permits go out over the counter the day the application comes in. 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.
Roughly 180 of the ZIP’s homes predate 1940, and the historic village counts buildings from 1855 to 1958; the ductwork in those was added after the fact. New equipment can only move the air the ducts will pass. Ask whether the quote measured them, and whether the vent and flue were checked too.
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.
Tyler from SwiftPro is very knowledgeable and professional on HVAC. Tech Edis and Rony are very professional and done good job to install AC
Where we work
Next door to Catlett: Calverton, Casanova, Midland, Nokesville and Bristow.
Questions
Mostly, with help. A heat pump loses output as the air gets colder. The Warrenton 3 SE station, seven miles west-northwest, averages a January low just under 25 degrees and about five nights a year at 10 or below, and it read 3 degrees in January 2014 and 2 in February 2015. Fauquier County’s design table uses 17 degrees for winter. On nights near that figure or under it, the electric strips or the propane furnace behind the heat pump carry the house. Ask the quote to name which one backs it up.
Not by itself. Quarter-size hail fell in Catlett on April 15, 2024, and hail that size presses a coil’s aluminum fins flat. Fins can often be combed back open, which is a repair. What changes the answer is a cracked cabinet, crimped copper lines, or a unit already past twenty years with a furnace that matches it. The diagnostic visit is $99, and it tells you which side of that line you’re on.
$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 Catlett 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.