Furnace and AC replacement in Middleburg.
Furnace and AC replacement in Middleburg runs $8,898 to $23,000 installed. In 20117 that pair is usually a propane furnace and an air conditioner or heat pump.
- Your price range up front
- Sized to the house, not the old label
- Dedicated HVAC team
Get your new system priced
Storm-felled limbs, golf-ball hail and a historic streetscape all weigh on a Middleburg system.
Count what’s in the house first. Across 20117, 582 of the 927 owner homes heat with electricity, usually with an air handler and backup strips where a furnace would sit, so the matching swap there is a heat pump system, $8,499 to $21,650 installed. A furnace and air conditioner together is the job in the 187 propane houses and the 41 on piped gas.
Winter is the bigger load out here. NOAA’s normals from the Purcellville co-op, the closest station at Middleburg’s height, run to 4,942 heating degree days a year and only 1,050 cooling ones, though about 30 afternoons a year still reach 90. The furnace half is sized from the winter heat loss, the cooling half from the summer gain, and both from measurements.
Storms end a lot of outdoor units here. On June 21, 2021, gusts estimated near 69 mph blew down numerous trees around Middleburg, some on Washington Street near Chestnut Street, and on June 16, 2016, golf-ball hail fell less than a mile northwest of town. A limb through the fan guard or a coil flattened by hail on a condenser near twenty usually decides it, and if the furnace is as old, price the pair.
Inside the Historic District the condenser is part of the streetscape. The Town’s design guidelines ask for heating and cooling equipment in the least visible spot on or next to the house, enclosed in a screen whose material and color suit it, and discourage rooftop units on front roofs. A new condenser is seldom the same shape as the old one, and any change in form a public street can see needs a Certificate of Appropriateness, filed with scale drawings two weeks before the committee’s monthly meeting.
Middleburg houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
Middleburg
ZIP 20117 as a whole: every Middleburg address, the Town and the farms around it, about a tenth of the land in Fauquier County. The Census place for the Town alone has too few homes for steady figures.
- Median home built1986 Census
- Built before 1980about 5 in 10 Census
- Built since 2000about 3 in 10 Census
- Most homes aresingle-family houses, about 8 in 10 Census
- Heated withelectricity, about 6 in 10 Census
- Rentedabout 3 in 10 Census
- A few homes still burn heating oil. We don’t work on oil burners, but a switch to a heat pump or a gas or propane furnace is ours to price.
- Electric heat here usually means a heat pump with backup strips, which is priced as a heat pump system, not a furnace and AC.
What a new furnace and AC costs in Middleburg.
$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 Middleburg.
After the storm, the condenser looks crushed
Don’t switch it back on to test it. From a few feet away, look for a dented top, flattened fins or a line set pulled loose, then call us after the storm and we’ll check it all, wiring and furnace included. If both halves are past fifteen, that visit is when we price the pair.
Your heat may not be a furnace
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 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.
Who signs off on a new system in Middleburg.
Loudoun County
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.
How to pick who replaces your furnace and AC in Middleburg.
Ask every company that quotes the job, us included.
Did they plan for the Town’s review before ordering?
In the Historic District, a differently shaped condenser in the same spot can still need a Certificate of Appropriateness. Ask that the quote name where the new unit goes and how it’s screened.
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.
Ndung and Oscar were great. Everything went smoothly, and after the install they made sure to show me everything I needed to know about the new unit.
5.0 stars across 884 Google reviews. Read them on our reviews page.
Furnace and AC replacement questions from Middleburg.
Which permits does a new furnace and AC need in Middleburg?
Loudoun County’s fee schedule lists a mechanical permit for replacing central heating and air conditioning in a house, and a propane or gas furnace takes the County’s gas permit too. Inside the town limits, the Town’s guidelines say its Zoning Administrator may need to clear the job first. On the Fauquier side of 20117, Fauquier County handles it.
Our old house in town has no ductwork upstairs. Can a new system fix that?
Sometimes, where an attic or stacked closets give the ducts a path without tearing into old plaster. Where they don’t, a ductless mini split upstairs beside a new system for the rest is often the cleaner job.
How much does a new furnace and AC cost in Middleburg?
$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 Middleburg.
More from SwiftPro in Middleburg
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 Middleburg 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.