Open 24/7 for emergencies
For heat pump repair in Herndon, 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 Herndon, SwiftPro is rated 5.0 stars across 1,130 reviews and works under Virginia Class A contractor license 2705192276. We cover heat pump repair in Herndon, Dranesville, Franklin Farm and Hutchison. We find why it isn’t heating and price the repair in writing before we start. 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.
Get your price in writing
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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 Herndon
Herndon leans on heat pumps more than almost anywhere else we work in Fairfax County. Inside the town limits six of every ten owner homes heat with electricity, and out in Hutchison, all those townhouses and condos off Centreville Road, it’s closer to three in four. So when the first real cold week hits, a lot of our Herndon calls are the same one: the outdoor unit is running, the vents are blowing, and the house still won’t get past 64.
The typical owner home in town went up in 1981. A heat pump from the early 2000s that’s still running in one of those houses is very likely on R-22, the old refrigerant. It’s no longer made, so a leak on that unit is a different conversation than a leak on a newer one. A failed capacitor or contactor is still a small fix on any age of pump. A big leak on an R-22 system usually isn’t worth chasing, and we’ll tell you that before you spend on it.
In the town’s townhouse rows the outdoor units sit side by side on pads out back, which makes it easy to compare. If your neighbor’s fan is spinning on a cold morning and yours is sitting silent with the indoor fan still blowing, that’s often the contactor or the capacitor. If yours is caked white while theirs shows wet coil, it’s stuck out of defrost. Either way, snap a phone photo of both before you call. It saves time at the door.
Dranesville and Franklin Farm are mostly detached houses from the 70s and 80s, and many of them run two systems, one upstairs and one for the main floor. When only one floor is cold, it’s one unit, and the repair is on that pump, not the whole house. Check which breaker and which thermostat go together before we get there, and we’ll start on the right one.
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 |
|---|---|---|---|---|
| Franklin Farm | 1985 | single-family houses, about 9 in 10 | electricity, about 5 in 10 | Mostly electric heat: heat pumps, and the bill shows trouble first. |
| Herndon | 1981 | single-family houses, about 4 in 10 | electricity, about 6 in 10 | Mostly electric heat: heat pumps, and the bill shows trouble first. |
| Dranesville | 1984 | single-family houses, nearly all | electricity, about 6 in 10 | Mostly electric heat: heat pumps, and the bill shows trouble first. |
| McNair | 2003 | condo and apartment buildings, about 6 in 10 | gas, about 7 in 10 | Condo units: small heat pumps, owner’s to fix. |
| Floris | 1990 | single-family houses, about 8 in 10 | gas, about 6 in 10 | Mostly gas: heat pumps here often sit over a furnace. |
| Hutchison | 1979 | townhouses, about 5 in 10 | electricity, about 7 in 10 | Mostly electric heat: heat pumps, and the bill shows trouble first. |
| Sully Square | 2015 | condo and apartment buildings, about 6 in 10 | gas, about 6 in 10 | Condo units: small heat pumps, owner’s to fix. |
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. Floris, Franklin Farm, McNair and Dranesville, on the Fairfax County side, are counted by the Census as places of their own.
What you’d notice
In a Herndon townhouse with the air handler in a hall closet or the attic, the backup strips can carry the heat for weeks after the outdoor unit stops pulling its weight. Walk outside on a cold day: if the fan’s still and the house is warm, the strips are doing the work, and that costs you every hour they run.
When the outdoor unit stops pulling its weight, the electric strips in the air handler carry the house. The house stays warm, and the bill tells you a few weeks later. A stuck contactor is a common reason, and one of the cheapest fixes on our list.
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 Herndon?
A person answers day and night. See this month’s deals before you call.
Choosing who fixes it
Questions worth asking anybody who comes out, us included.
On a Herndon heat pump installed before about 2010, ask what refrigerant it runs. A tech who prices a big refrigerant repair without telling you the unit is on R-22 is skipping the part that decides whether the repair makes sense.
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.
Excellent work done honestly and efficiently. Efrain the technician was great. Was able to diagnose the problem quickly and get my older Amana gas furnace system working again.
Where we work
Next door to Herndon: Reston, Sterling, Great Falls, Oakton and Chantilly.
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
If the unit serves only your condo, it’s usually yours to repair even when it sits on common ground. Check your association’s rules before the visit so we can get to it, and let the manager know a tech is coming.
For a small part, yes, often. A capacitor runs $240 to $370 and a contactor $290 to $425, and either can buy you another season. For a compressor or a big refrigerant leak on an older pump, we’ll lay the repair and a replacement side by side so you can pick with the numbers in front of you.
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 Herndon 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.