Open 24/7 for emergencies
Warm air from the vents usually comes down to one of five things: the thermostat isn’t set to Cool, a clogged filter has choked the airflow until the coil iced over, a breaker tripped, the outdoor unit stopped running (most often a worn-out capacitor or a burnt contactor), or the system is low on refrigerant, which means it’s leaking. The first three you can check yourself in ten minutes; the last two need a technician.
House hot right now? Call (703) 997-9757. We answer day or night, and we will tell you honestly when we can get there.
5.0 stars across 1,138 reviews
A SwiftPro technician at an outdoor unit in Northern Virginia.
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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
Start here
None of these need a tool or a ladder, and none of them open a panel. Go in order: the first three cost nothing and fix more warm-air calls than people expect.
If the checks don’t fix it
SwiftPro’s own repair prices in Northern Virginia. Where your job lands in its range depends on the part and the equipment it goes into.
That’s almost always the run capacitor, the part that gives the compressor and the fan their kick to start. Replacing it runs $240 to $370.
It’s the repair we make more than any other on an air conditioner, and the part is usually on the van. Keep the system off until it’s fixed: a compressor that keeps trying to start without a good capacitor runs hot.
With the breakers on, silence usually means a burnt contactor, the switch that sends power to the outdoor unit. That’s $290 to $425.
A pitted contactor can also stick closed, so the outdoor unit keeps running after the house is cool. Either way it’s a small part.
That’s usually low refrigerant, and low refrigerant means a leak, because an air conditioner doesn’t use it up. A top-up runs $190 to $740. Finding the leak, fixing it and recharging the system runs $1,850 to $2,700. From about $31 a month at 0% APR for 60 months, the whole price financed, on approved credit. How financing works
A top-up buys a summer. If it needs another one next year, the leak is costing more than the repair would, and that’s the point where we price both.
A blower wheel caked in dust moves a fraction of the air it should. Pulling it and cleaning it runs $300 to $440.
Outside, a condenser coil matted with dirt can’t shed heat, so the system runs longer for less cooling. That’s cleaned on an AC maintenance visit.
Outdoor fan not spinning at all? That one has its own answer: why an AC fan stops spinning. A heat pump blowing cool air outside in winter is a different thing, and usually normal: when the outdoor unit blows cold.
Still warm after the checks?
The diagnostic visit is $99, and you get the repair price in writing before anyone starts.
Time to call
Call (703) 997-9757. We answer day or night, and we will tell you honestly when we can get there. SwiftPro runs 24/7 emergency service across Northern Virginia, and a phone call goes onto the dispatch board instead of the next open slot. The diagnostic visit is $99, included for Comfort+ members.
Virginia Class A contractor license #2705192276, BBB Accredited with an A rating, and 5.0 stars across 1,138 reviews. Read them all.
A SwiftPro technician beside a condenser on a Northern Virginia driveway, our trucks behind him.
What the neighbors said
5.0 stars across 1,138 reviews. Here are three from calls like this one.
SwiftPro was able to schedule a repair visit that day when our a/c was blowing warm air. They sent out a qualified technician who communicated effectively and resolved our problem quickly. He also made a few recommendations to keep our unit in working order. Thanks Jaime for the great job.
AC blowing warm air
…our A/C was not cooling the house…a quick check outside confirmed my worst fear that the outside unit fan was not working. … David's expertise allowed him to quickly pinpoint the problem, a switch on the outside unit, David had the part on his van, quickly replaced the switch and the cold air started flowing again.…
Outdoor unit fan not working
…We had a seasonal check done before it became hot. Eddye truly helped us out by finding and replacing two capacitors that were operating far beneath what they should be, and he replaced them. I'm certain they would have failed in the July heat. He avoided what would have been a big problem for us in the summer heat.
Weak capacitors caught on a spring check
Reviews are shown as customers wrote them, word for word. SwiftPro does not write, edit, buy or remove customer reviews, and offers no incentive in exchange for one.
Asked on the phone
Most often the thermostat isn’t on Cool, a clogged filter has iced the coil, a breaker has tripped, or the outdoor unit has stopped running, usually from a failed capacitor or a burnt contactor. If everything runs and the air is only cool-ish, it’s usually low refrigerant, which means a leak. Check the thermostat, the filter and the breakers yourself; the rest needs a technician.
Usually the compressor isn’t starting even though the fan is (often the capacitor again), the system is low on refrigerant, or the indoor coil has iced over. Check the filter and look for ice on the copper lines. If both are fine, call: someone needs gauges on it.
Check the breakers first, inside and out, plus the disconnect beside the outdoor unit, because the surge when the power comes back can trip them. Make sure the thermostat is still on Cool, since some reset. Then give it a few minutes: many systems wait before restarting the compressor. Still warm after that, and a surge may have taken out the capacitor or a control board.
No. Turn it off at the thermostat until you know why. A compressor that can’t start, or one running with an iced coil or low refrigerant, overheats, and the compressor is the most expensive part in the system. Leave the fan on if you want air moving.
Most of the fixes behind warm air are small: $240 to $370 for a capacitor or $290 to $425 for a contactor, plus the $99 diagnostic visit. A refrigerant leak found, fixed and recharged is $1,850 to $2,700. You get the price for yours in writing before any work starts. From about $31 a month at 0% APR for 60 months, the whole price financed, on approved credit. How financing works
No. Opening the refrigerant side of a home system takes an EPA Section 608 certification, and a system that’s low on refrigerant has a leak, so adding more without finding it means paying for it again next summer.
Call SwiftPro at (703) 997-9757. It’s a licensed Virginia Class A contractor (#2705192276), BBB Accredited with an A rating, with 5.0 stars across 1,138 reviews, and it was named BusinessRate’s Best of 2026, the #1 heating contractor in Fairfax, Virginia. Warm air is a regular call in Fairfax: in July 2026 a compressor in 22033 wouldn’t start on a failed dual run capacitor, and in October an indoor coil in 22033 was freezing on a system short of refrigerant. We answer day or night, and we will tell you honestly when we can get there. The diagnostic visit is $99. More on AC repair in Fairfax.
Call (703) 997-9757 rather than booking online: a phone call goes onto the dispatch board instead of the next open slot. We answer day or night, and we will tell you honestly when we can get there. SwiftPro runs 24/7 emergency service across Northern Virginia.
Still blowing warm?
If the house is hot now, call (703) 997-9757. We answer day or night, and we will tell you honestly when we can get there. Or send the form at the top and the office calls or texts you back.
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
Prices are SwiftPro’s own ranges for the repair on a standard residential system in Northern Virginia, and the exact price for yours is written down on site before any work starts. The diagnostic visit is separate, and included for Comfort+ members.