Open 24/7 for emergencies
For heat pump repair in Warrenton, the diagnostic visit is $99. Call SwiftPro, rated 5.0 stars across 1,130 reviews, at (703) 997-9757, 24 hours a day, 7 days a week.
For heat pump repair in Warrenton, SwiftPro is rated 5.0 stars across 1,130 reviews and works under Virginia Class A contractor license 2705192276. Heat pump repair in Warrenton, the Town, New Baltimore and Vint Hill, where January nights run colder than closer in. We find the fault and price it first. A contactor runs $290 to $425 and a defrost board $450 to $1,150, from our published price book.
5.0 stars across 1,130 reviews
A Trane heat pump on its pad in a Northern Virginia winter, the kind of morning the calls come in.
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Rather talk now? (703) 997-9757
Licensed and insuredVirginia Class A contractor #2705192276
24/7 emergency serviceWe answer day or night, 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
The same price book as the rest of our site. The diagnostic visit is $99, and the tech prices the repair before starting it.
Repair diagnostic visit
$99
Run capacitor replaced
$240 to $370
Contactor replaced
$290 to $425
Thermostat replaced
$300 to $640
Defrost board replaced
$450 to $1,150
Control board replaced
$550 to $1,180
Prices checked .
We answer day or night, and we will tell you honestly when we can get there.
With Comfort+ membership, $20 a month or $199 a year, the diagnostic visit is included, any service is 15% off, and a heating maintenance visit comes every fall.
What’s different in Warrenton
NOAA’s weather station just southeast of the Town of Warrenton averages a January low about five degrees colder than Reagan National. For a heat pump, that gap is the difference between carrying the house alone and leaning on backup for a good part of every cold night. Fewer than three in ten owner homes in town heat with electricity, but on those nights a weak pump shows up here first.
Out in New Baltimore and Vint Hill, almost every house is detached, half of them from 2000 or later, and about one owner in seven burns propane. Plenty of those homes pair the heat pump with a propane furnace, and an outdoor sensor decides when to switch. Set too high, the furnace burns propane on days the pump could handle. Set too low, the pump labors through nights it can’t win. Part of a Warrenton repair visit is checking where that switchover sits.
Bigger lots bring their own wear. A unit set out in the open catches the wind and drifting snow on its exposed side, and a pad that settles in soft ground tilts the cabinet until meltwater pools under the coil and refreezes. Keep a couple of feet clear around yours after a storm, and check that it still sits level. Those two things head off a lot of iced coils out here.
Inside the town limits the mix is older. More than a quarter of the homes predate 1960, and a few owners still burn wood. A woodstove in the family room can make a heat pump look broken: the thermostat on that wall reads warm, the pump rests, and the bedrooms at the far end go cold. Before we condemn a part, we’ll look at where the thermostat hangs and what’s heating the air around it. Newer streets near Alwington Boulevard have the opposite problem: two systems, one thermostat each.
Neighborhood by neighborhood
Census figures for each place, and what that usually means for a heat pump. Median year built and heat count owner-occupied homes only.
| Place | Median home built | Most homes are | Heated with | What that means for a heat pump |
|---|---|---|---|---|
| New Baltimore | 1999 | single-family houses, nearly all | gas, about 5 in 10 | A mix of heat pumps and furnaces. |
| Warrenton | 1993 | single-family houses, about 5 in 10 | gas, about 6 in 10 | Mostly gas: heat pumps here often sit over a furnace. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
Inside the town limits, a little over 4 of the roughly 110 square miles the two Warrenton ZIP codes cover: the Historic District around Main Street, Leeds Square, and the streets off Broadview Avenue and Alwington Boulevard.
New Baltimore only. It’s the one Census place on the county side with mostly Warrenton mail, so the farms and lots beyond it aren’t in these figures.
What you’d notice
On a Warrenton dual fuel house, a propane delivery coming sooner than usual can mean the furnace has taken over work the heat pump should be doing. Either the switchover is set too high or the pump has a fault that locks it out. Both are worth a look before the next fill.
In a newer two-story house on one heat pump, the top floor lagging a few degrees can be ducts or the thermostat’s settings, not a failing unit. We check the system first and tell you which it is.
A little frost on a cold morning is normal, and the unit melts it off every so often by running backwards for a few minutes. Ice that builds for hours and covers the whole coil usually means the defrost board, a sensor, or low refrigerant.
Need heat pump repair in Warrenton?
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Choosing who fixes it
Questions worth asking anybody who comes out, us included.
On a heat pump paired with a propane or gas furnace, ask whether the tech will check the outdoor sensor and the switchover setting. A healthy pump on the wrong setting costs you as much as a broken one.
Anyone can check on the state’s license lookup. Ours is Virginia Class A contractor license, on every van.
Every heat pump repair on our list has a range, and you hear where yours lands before a part goes in. If someone can’t give you a number until it’s done, keep looking.
An older heat pump with a refrigerant leak is often a bad repair. A good tech says so, with the repair price and the replacement price side by side.
Two of our crew going over a work order before the day's calls.
From our Google reviews
5.0 stars across 1,130 reviews. Read them on our reviews page.
Swiftpro did a great job fixing my heat pump to get my AC working again. They’re easy to work with and explained everything so that I was able to comprehend the issue well. They beat out other local competitors in price for the same service by 40%.
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.
Questions
On the coldest nights here, often yes. Long run times are how a heat pump keeps up. What isn’t normal is a house that keeps falling behind while the outdoor unit ices over. That points to defrost, refrigerant or airflow, and it’s worth a call.
The diagnostic is $99. A thermostat replaced runs $300 to $640 and a defrost board $450 to $1,150, the two that cold weather tends to find. If the compressor is the problem, we’ll price a replacement next to the repair so you can compare.
That’s defrost. The unit stops the outdoor fan, runs backwards for a few minutes to melt frost off the coil, and you see steam rising. It’s normal. Ice that stays is not.
The diagnostic visit is $99. From our price book, a capacitor is $240 to $370, a contactor $290 to $425, and a defrost board $450 to $1,150. You get the number before we start.
Ready when you are
Call, or send the form at the top. The tech prices the repair from the book before starting, and if the system is at the end of its life 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
SwiftPro Plumber & Water Heaters
4200 Lafayette Center Dr, Suite N, Chantilly, VA 20151
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 Warrenton and the rest of Northern Virginia. Virginia contractor license #2705192276. 5.0 stars across 1,130 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.