Furnace and AC replacement in Dunn Loring.
Furnace and AC replacement in Dunn Loring runs $8,898 to $23,000 installed. The 1990s built the most houses in 22027, and their second systems are aging now.
- Your price range up front
- Sized to the house, not the old label
- Dedicated HVAC team
Get your new system priced
Dunn Loring cools less than the airport numbers say, and heats a good deal more.
The weather station nearest Dunn Loring with thirty years of normals sits 3.6 miles west in Vienna, and it runs cooler in summer than the airports people tend to quote. July there averages a high of about 84 degrees, against nearly 88 at Dulles and about 90 at Reagan National, and it reaches 90 on about 13 days a year where Dulles sees about 33. Its winters, though, add up to roughly 4,900 heating degree days. A system here heats first and cools second.
That’s a reason to work the size out from the house rather than copy the old label. An air conditioner sized for an airport summer is too big for this one: it chills the rooms fast and shuts off before it has wrung the moisture out, leaving the upstairs cool but clammy on a muggy June night.
In 22027 the 1990s built 217 of the ZIP’s 659 homes, more than any other decade, and the 1980s another 125. The pair those builders installed ran on R-22, and many of those houses have already replaced it once, often in the R-410A years after 2010. That second pair is now in its teens, and a new outdoor unit can’t simply join half of it: today’s units run on the newer A2L refrigerants and need an indoor coil made for them, and that coil sits on top of the furnace.
Look up before the new outdoor unit goes down, too. The National Weather Service log for the June 29, 2012 derecho puts estimated gusts near 70 miles an hour in Dunn Loring, with three large branches across two lanes of Prosperity Avenue, and in July 2017 a thunderstorm dropped a tree onto a Metro car at the Dunn Loring station. If the old pad sits under a big limb, ask whether the new one can sit clear of it.
Dunn Loring houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
Dunn Loring
ZIP 22027 as a whole: every Dunn Loring address. The Dunn Loring Census place is bigger: about three in four of its homes have Vienna mail.
- Median home built1991 Census
- Built before 1980about 3 in 10 Census
- Built since 2000about 2 in 10 Census
- Most homes aresingle-family houses, about 9 in 10 Census
- Heated withgas, about 7 in 10 Census
- Rentedhardly any Census
- Most homes here heat with gas, so the usual pair is a gas furnace inside and an air conditioner outside, with the coil sitting on the furnace.
What a new furnace and AC costs in Dunn Loring.
$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
- Furnace alone, keeping your AC$4,285 to $14,040
- Heat pump system instead$8,499 to $21,650
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.
When replacing both makes sense in Dunn Loring.
The AC died and the furnace is the same age
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.
The outdoor unit runs on R-22
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 big repair on an old system
A compressor or heat exchanger on a system past 15 years deserves a replacement price beside it, and you’ll get both numbers.
Who signs off on a new system in Dunn Loring.
Fairfax County
Fairfax County lists replacing a heating or cooling system as mechanical permit work. Source.
Fairfax County requires a permit to replace any gas appliance, even like for like: a gas water heater, furnace or boiler. Replacing a fuel-burning appliance also needs a chimney vent certification. Source.
Fairfax County asks for an A2L refrigeration system certification with the permit for any heat pump or air conditioner that runs on the newer A2L refrigerants. Source.
How to pick who replaces your furnace and AC in Dunn Loring.
Ask every company that quotes the job, us included.
Which weather did they size it for?
Ask what outdoor design temperatures the load calculation used, and what it assumed about your walls, windows and insulation. Sizing usually leans on a nearby airport’s data, and the Vienna station runs a few degrees cooler in July. A quote with no calculation behind it at all is a guess.
Do they size it to the house, or copy the old label?
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.
Is the whole job in the written price?
Furnace, outdoor unit, matching coil, refrigerant lines, thermostat, permit and hauling the old one away. If it isn’t on the paper, ask.
Already holding another company’s quote?
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.
What our customers say.
Rich did a great job. We hit it off very well. He was on time, and we promptly gathered the necessary measurements. He explained all the details. He prepared the estimate while at the house. This work is for a HVAC full replacement.
5.0 stars across 884 Google reviews. Read them on our reviews page.
Furnace and AC replacement questions from Dunn Loring.
Is the ductwork in a 1990s Dunn Loring house good enough for a new system?
Usually it’s in better shape than a 1960s house’s, since it was laid out for central air from the start. The return is still worth measuring: plenty of houses from those years have one or two returns for the whole upstairs, and a new system can’t move more air than they let back in.
Should the new system be a heat pump instead of an air conditioner?
It can be. With only a few nights a year at 10 degrees or below at the Vienna station, a heat pump can carry most of a Dunn Loring winter and leave the coldest nights to the gas furnace; our dual fuel guide walks through that pairing. An all-electric heat pump system runs $8,499 to $21,650 installed.
How much does a new furnace and AC cost in Dunn Loring?
$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.
Do I have to replace both at the same time?
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.
More from SwiftPro in Dunn Loring.
More from SwiftPro in Dunn Loring
Start with your number, then a written quote.
Call, book online, 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 is a licensed, BBB Accredited (A rating), independently owned heating, cooling and plumbing company in Chantilly, serving Dunn Loring and the rest of Northern Virginia. Virginia contractor license #2705192276. 5.0 stars across 884 Google reviews. SwiftPro maintains a dedicated HVAC team and a dedicated plumbing team.
SwiftPro Heating, Cooling & Plumbing, 4230 Lafayette Center Dr, Suite N, Chantilly, VA 20151, (703) 997-9757. Book online, read our reviews, or see every town we serve.