Open 24/7 for emergencies
The diagnostic visit is $99, and a run capacitor replaced is $240 to $370 from our published price book.
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AC and heat pump repair in Great Falls, 22066, for big houses on two or three systems and condensers under the trees, priced from the book first.
5.0 stars across 1,132 reviews
One of our HVAC technicians beside an outdoor unit at a Northern Virginia home, the vans at the curb.
Licensed and insuredVirginia Class A contractor #2705192276
24/7 emergency serviceOften same-day, 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 our AC repair page. The diagnostic visit is $99, and the common parts ride on the truck, so most of these get fixed on the first visit.
Run capacitor replaced
$240 to $370
Contactor replaced
$290 to $425
Condensate drain cleared
$175 to $420
Refrigerant topped up
$190 to $740
Blower wheel pulled and cleaned
$300 to $440
Refrigerant leak found and repaired
$1,850 to $2,700
or $31/mo at 0% APR for 60 months
Repair diagnostic visit
$99
Monthly figures: 60mo @ 0% APR on each starting price, the whole price financed, on approved credit. Longer plans lower the payment and cost more in total. The lender sets the final terms. How financing works
Often same-day, 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 the cooling and heating maintenance visits are part of the membership.
What’s different in Great Falls
Fairfax County’s tax records put the middle Great Falls house at about 3,700 square feet above ground, and that’s before the basement, which nine in ten of them have. One air conditioner can’t carry that. A house that size is usually zoned: one system for the basement and main floor, another in the attic for the bedrooms, sometimes a third for a finished lower level or an addition. Each has its own outdoor unit, so when one quits, the whole house doesn’t go warm. One end of it does.
Then there are the trees. The county’s own plan for this part of Fairfax says it plainly: Great Falls has many large and old trees. A condenser tucked under them pulls in seed fluff in spring and leaves in the fall, and the coil mats over until the unit can’t shed its heat. It runs hot, and running hot is hard on the run capacitor, which is $240 to $370 to replace. Before you call, switch it off at the disconnect and look at the fins. If they’re furred over, a gentle rinse with a garden hose may be all it needs.
What kind of system you have depends on the fuel, and Great Falls has four. A little under half the owner homes burn natural gas, and about four in ten heat with electricity, which usually means a heat pump that works all winter too. About one in seven burn propane or heating oil, close to five times the share across the county. In those houses the cooling is a separate split system, a condenser outside and a coil on the furnace or an air handler in the attic, and it breaks the same way central air breaks anywhere.
Half the homes here went up in the 1970s and 80s, so most are on their second or third air conditioner. A unit put in before 2010 is probably charged with R-22, the old refrigerant nobody makes anymore, and topping one up only buys you a summer. If yours is that age and leaking, put the replacement number next to the $1,850 to $2,700 leak repair before you choose.
By the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
What you’d notice
Under big trees the outdoor coil can mat over in a couple of weeks of spring seed fall. The fan still spins, the air inside never gets properly cold, and on the hottest afternoon the unit trips out. Look at the fins before you call; packed fins are the first thing we check.
Usually the outdoor unit has stopped running. A hum with no fan turning is almost always the run capacitor; silence while the thermostat calls is usually the contactor.
That’s an airflow problem far more often than a refrigerant problem: a clogged filter, a matted coil, or a blower wheel packed with dust.
Choosing who fixes it
Questions worth asking anybody who comes out, us included.
In Great Falls the answer is usually two, sometimes three. A tech who knows that ahead of time goes to the zone that’s warm, not just the unit by the driveway. Tell whoever you call how many outdoor units you have and which rooms aren’t cooling.
A company that prints what a capacitor or a contactor costs has already told you the number. One that won’t say until the tech is in your driveway hasn’t.
A healthy system drops the air somewhere around 16 to 22 degrees across the indoor coil. Low refrigerant means a leak, and topping it up every summer is the expensive way to find that out.
Some repairs aren’t worth doing on a 20-year-old system. The good answer shows you the repair price and the replacement price side by side and lets you pick.
Two of our crew going over a work order before the day's calls.
From our Google reviews
5.0 stars across 1,132 reviews. Read them on our reviews page.
Elvis did excellent work repairing my heater and air conditioner. I couldn’t be happier!
Questions
Yes. The cooling in an oil or propane house is an ordinary split system, a condenser outside and a coil or air handler inside, and it’s repaired from the same price book: a contactor is $290 to $425, a blocked condensate drain cleared $175 to $420. Tell us where the indoor half sits, basement or attic, when you book. The oil burner itself goes to an oil heat company; we don’t work on oil.
Yes. Great Falls has no town hall, so Fairfax County issues it: the county lists a new heating or cooling system as mechanical permit work, and wants an A2L refrigeration certification filed for units that use the newer refrigerant blends. Repairs don’t need one.
The diagnostic visit is $99. The common repairs: a run capacitor $240 to $370, a contactor $290 to $425, a condensate drain cleared $175 to $420, refrigerant topped up $190 to $740. A refrigerant leak repair runs $1,850 to $2,700.
Fix the cheap parts on almost anything. Think twice about a big repair on a system over 15 years old, and about any leak on an R-22 system. The HVAC estimator prices a new system in about a minute, so you can put the two numbers side by side.
Ready when you are
Call, or send the form at the top. The tech prices the repair from the book before starting, and if it’s the end of the road 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
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 Great Falls and the rest of Northern Virginia. Virginia contractor license #2705192276. 5.0 stars across 1,132 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.