Furnace and AC replacement in Gainesville.
Furnace and AC replacement in Gainesville runs $8,898 to $23,000 installed. Half of 20155’s owner homes date from 2005 or before, so plenty of pairs are due.
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- Sized to the house, not the old label
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Get your new system priced
The typical 20155 owner home was finished in 2005, and many still run the pair it came with.
Put every owner home in the 20155 ZIP in order by the year it was finished, and the one in the middle dates from 2005, by the Census Bureau’s count; inside the part the Census calls Gainesville, it’s 2007. So the middle Gainesville house is about twenty, and so is a furnace and air conditioner that went in with its drywall, if nobody has changed them since. Same birthday, and the new outdoor unit’s coil sits right on top of the old furnace: that’s the case for doing both at once.
About four in ten owner homes inside the Census line went up in 2010 or later. If yours is one, this page probably isn’t for you yet: a system that young most likely runs R-410A, still made and serviced, and a failure on it is usually a repair, not a pair. The $99 diagnostic visit puts that repair price beside the replacement range, so you see both numbers before deciding.
Virginia Oaks, from 1994, has likely been through this once already: most of its houses are past the age of a first pair, and some second pairs there went in before 2010 themselves. Replacing an exterior air conditioner needs no application under its design guidelines. Heritage Hunt was built after its 1997 zoning and is left out of the Census figures, and its systems run from originals to replacements.
Not sure which you have? Read two labels. The furnace’s rating plate is inside its front panel, and the outdoor unit’s plate names its refrigerant and often its year. Two dates from before 2010 and R-22 outside is the textbook case for replacing both; one old date and one young one means you may only need half.
Gainesville houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey, owner-occupied homes unless it says otherwise.
Gainesville
- Median home built2007 Census
- Built before 1980hardly any Census
- Built since 2000about 8 in 10 Census
- Most homes aresingle-family houses, about 6 in 10 Census
- Heated withgas, about 8 in 10 Census
- Rentedabout 2 in 10 Census
- Many houses here still run the builder’s furnace and AC, and the two tend to wear out together.
- Townhouse furnaces sit in closets and attics, so the path in matters as much as the size.
What a new furnace and AC costs in Gainesville.
$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 Gainesville.
You’re about to list a 2000s house
A buyer’s home inspector notes the age of the furnace and the outdoor unit, and on a 2000s pair that line can come back as a request for a credit. Pricing the pair first tells you whether to replace before listing or negotiate with a real number.
Both halves went in with the house
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.
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.
Who signs off on a new system in Gainesville.
Prince William County
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.
How to pick who replaces your furnace and AC in Gainesville.
Ask every company that quotes the job, us included.
Did they read both labels before quoting both halves?
A quote for the pair should name the age and refrigerant of what’s there now. If the air conditioner turns out to be a 2016 replacement, you may only need the furnace, at $4,285 to $14,040 installed.
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 Gainesville.
We bought new in Gainesville in 2015. Is it time for a new furnace and AC?
Not on age alone. A 2015 system runs R-410A and is about eleven years old, so most of what goes wrong with it is worth fixing. Get the repair priced first, and keep the $8,898 to $23,000 range in mind for later.
Does Virginia Oaks have to approve the new outdoor unit?
Not when it replaces the old one where it stood: its guidelines put replacing an exterior air conditioner on the list of changes that need no application. Moving it somewhere new is different, because anything that adds or changes a structure on the lot needs an approved Exterior Changes Application first.
How much does a new furnace and AC cost in Gainesville?
$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 Gainesville.
More from SwiftPro in Gainesville
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 Gainesville 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.