Open 24/7 for emergencies
A furnace and AC replaced together in Paeonian Springs runs $8,898 to $23,000 installed. Half the owner homes here were built in 1997 or earlier.
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 Paeonian Springs
The median owner home in ZIP 20129 was built in 1997, which makes an original furnace and air conditioner nearly three decades old. Three in four owner homes date from 1980 or later, so a lot of pairs sit in that stretch. Replacing both at once is a single install, with the indoor coil matched to the new outdoor unit instead of an old coil carrying a new condenser. $8,898 to $23,000 is the range, and the estimator quiz prices your house.
The Purcellville station logs 4942 heating degree days a year against 1050 cooling degree days, so winter outworks summer by nearly five to one. Of the two machines, the furnace has the longer season. A heat pump system, $8,499 to $21,650, takes the cooling job and a good part of the heating. A furnace alone, keeping the AC you have, is $4,285 to $14,040.
Nearly half of the owner homes here heat with propane, about 35 percent with electricity and nearly one in five with oil, and natural gas registers at zero. With propane, a heat pump can pair with a propane furnace, the heat pump carrying the mild weeks and the furnace taking the coldest nights. With electric heat, a heat pump system replaces the old one. Oil burners are outside what we service, so an oil-heated house gets priced for a heat pump, or a propane furnace with a new AC.
The outdoor unit has to live through the weather. A trained spotter measured 13.0 inches of snow a mile southeast of town on February 21, 2015, and storm winds snapped large poplars along Tim Tact Court on June 19, 2017. A heat pump should sit high enough to clear the snow, and a condenser does better away from the limbs that come down in storms like that.
When it’s time
When a furnace repair and an AC repair land in one year on a pair near three decades old, the two prices start to approach the cost of replacing both. Lay the two repair quotes out beside the replacement range, then decide. The diagnostic visit is $99.
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.
A compressor or heat exchanger on a system past 15 years deserves a replacement price beside it, and you’ll get both numbers.
Permits and sign-offs
Loudoun County requires a permit to swap a gas water heater or furnace. Since October 2025, a replacement that keeps the same BTUs in the same spot needs no plans. 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.
The old nameplate is a starting point, not an answer. A house that has been added to or re-insulated since 1997 may not need the same size of equipment. Whoever quotes the job should show how they sized it, in writing, before you sign anything.
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.
David and the install team that came over were friendly, knowledgeable and professional. Happy with the install of my Trane system. Tyler was a pleasure to work work with in getting me the best price. He’s got a good thing going over there. I’m glad I went with them!
Where we work
Next door to Paeonian Springs: Waterford, Hamilton, Leesburg, Lovettsville and Purcellville.
Questions
Probably not. A furnace alone keeps the newer AC, and that is $4,285 to $14,040 installed. Do both when the pair is the same age, or when the coil and the outdoor unit no longer match each other.
Size and efficiency. The range runs from $8,898 at the small end to $23,000 at the large end, installed, and where yours falls depends on the house, the efficiency you pick and what the ductwork and venting need. Answer the estimator’s questions and you will have a figure for your own house.
$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 Paeonian Springs 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.