Open 24/7 for emergencies
Furnace and AC replacement in Triangle runs $8,898 to $23,000 installed. Close to half its owner homes went up in the 2000s, with pairs to match.
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
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
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 Triangle
Triangle’s air conditioners keep working after dark. NOAA’s 1991 to 2020 normals for the Quantico Marine Corps Air Station, 3.8 miles away by the Potomac, put July’s average low at 70.7 degrees against 66.8 at Dulles Airport, and count 1,512 cooling degree days a year to Dulles’s 1,233. Those warm nights keep the outdoor unit cycling toward morning. On July 22, 2011, heat indices up to 118 were measured at Quantico.
That’s twenty-some summers on the original equipment. 915 of Triangle’s 2,089 owner homes went up from 2000 through 2009, and County plats for Moncure Woods, The Reserve at Potomac Crest and Garrison Woods, off Quantico Gateway Drive, date from 2004. Houses finished the same season usually got the same furnace and condenser, and they’re wearing out side by side. If both rating plates say 2004 or thereabouts, get the pair priced.
Not every pair is due. 356 owner homes went up from 2010 through 2019 and 55 more since 2020, Quantico Hills Overlook, platted in 2016, among the newest; systems that young usually earn a repair. The older streets run the other way: Thomasson Crossing dates from 1988 and the Graham Park plats from 1950, so a pair there is a replacement already, sometimes on ducts laid out before central air. On the base itself, Liberty Military Housing owns and maintains family housing, so on-post residents call their housing office.
Summer storms strain the outdoor half too. On August 10, 2022, a thunderstorm blew down several trees in Triangle near Route 1, Cabin Road and Locust Shade Drive. After one like that, look before you switch the cooling back on: a limb on the top grille, a dented cabinet, copper lines pulled loose at the wall. If anything looks off, leave it off and call us to check the whole system.
By the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
When it’s time
On a 2000s Triangle system that usually means lost capacity: a tired compressor, a slow refrigerant leak or a coil packed with dirt. A $99 diagnostic finds which. If it’s the compressor, or a leak on an R-22 unit, price the pair.
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.
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.
Permits and sign-offs
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.
Prince William County requires a permit to replace a gas or propane furnace or a gas appliance such as a water heater, even like for like. Replacing an electric water heater with one the same size in the same spot needs no permit. 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.
A new outdoor unit may want a different breaker than the 2004 one, and the disconnect box beside it has weathered the same twenty years. Ask whether the quote covers both.
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.
Moises and Oscar did a superlative job doing a custom installation of a new HVAC unit in a tight basement space. And they then took the time to go over system operation. Top tier job and service in all respects!
Where we work
Next door to Triangle: Quantico, Dumfries, Woodbridge, Stafford and Lorton.
Questions
Probably not. At that age a furnace and air conditioner usually have plenty left, and a failure that young is most often a part: a capacitor, a motor, a control board. Start with the $99 diagnostic.
With gas in about three Triangle owner homes in four, a heat pump in the air conditioner’s spot can carry the mild months while the furnace takes the coldest nights; that’s dual fuel. An all-electric heat pump system runs $8,499 to $21,650 installed, and the HVAC replacement estimator prices each option.
$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 Triangle 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.