Looking for an HVAC company in Dumfries? From Virginia's oldest chartered town to the brand-new streets of Potomac Shores, Leonard Splaine covers Dumfries heating and cooling the same day, just down Route 1 from our Woodbridge shop.
Why us?
Serving Dumfries
Dumfries is Virginia's oldest chartered town, and its housing shows the whole timeline: modest older homes along the Route 1 corridor, the established wooded neighborhoods of Montclair around the lake, and the brand-new construction pouring into Potomac Shores. Each needs something different from an HVAC company, and we work all three every week.
New construction isn't a free pass on comfort. Potomac Shores buyers call us about builder-grade systems that short-cycle, bonus rooms the ductwork never quite reaches, and warranties that require documented maintenance from day one. Meanwhile the older homes near town and the Quantico gate need the opposite: honest repair-or-replace guidance on systems that have earned retirement.
Our shop sits a few miles up Route 1, which is why same-day service in Dumfries is routine rather than a promise. We've earned a 4.9-star average across more than 1,300 Google reviews working this corridor the old-fashioned way: honest diagnosis, upfront pricing, and one local crew for heating, cooling, and electrical.
Our Services
AC repair, heating, heat pumps, and ductless, from Route 1 originals to Potomac Shores new builds.
AC calls in Dumfries split two ways: older systems along Route 1 and in Triangle that fail from age, and surprisingly young builder-grade units in Potomac Shores that fail from cut corners, undersized equipment, sloppy charge, flex duct kinked behind drywall. We're minutes down Route 1, we diagnose the actual cause, and we fix most of it same-visit at a flat-rate price.
Winter no-heat calls in Dumfries get priority, whether it's an aging furnace in an older home near town or a heat pump in Montclair icing up on a cold snap. We repair gas and electric furnaces, heat pumps, and boilers, and we still service oil heat, which some of the area's older houses run to this day.
In Montclair's wooded 70s and 80s homes we're usually replacing a system or two past its prime; in Potomac Shores we're often upgrading builder-grade equipment that never matched the house. Either way we size with a real load calculation, offer free estimates and 0% financing options, and install next-day on most systems.
Montclair's basements and bonus rooms, the older cottages near the historic district, and the garage gyms popping up all over Dumfries are prime mini-split territory. As a Mitsubishi Diamond Contractor we install quiet single- and multi-zone ductless systems that heat and cool spaces the main system was never going to reach.
Heat pumps dominate Dumfries, from Montclair originals to the new inverter systems going into Potomac Shores. We repair every brand, replace end-of-life units with high-efficiency models, and set up dual-fuel systems for homeowners who want gas backup when the temperature really drops.
Montclair's tree cover buries condensers in pollen and leaf litter, and Potomac Shores' manufacturer warranties require documented annual maintenance to stay valid. Our tune-ups handle both: coils cleaned, refrigerant and electrical checked, paperwork kept. Plan members get priority scheduling and waived diagnostics.
Brands
We repair every major brand and install new systems from the best of them. We're a Lennox Premier Dealer and a Mitsubishi Electric Diamond Contractor.
Current offers
Trust comes first, but fair deals don't hurt. Every offer below is available to every Dumfries customer, every day.
Special Offer
On a New Carrier System
0% APR with 60 equal monthly payments on qualifying new Carrier systems, financed through Wells Fargo and subject to credit approval. Sale period August 1 – November 20, 2026. Mention this offer when you book and we'll run the numbers on your replacement.
Expires: 11/20/2026
Special Offer
On a New Lennox System
Rebate up to $1,300, paid as a Lennox Prepaid Mastercard®, on a qualifying Lennox home comfort system, or combine a rebate up to $1,100 with 0% financing for 60 months. Buy July 6 – August 14, 2026; install by August 21. Qualifying system required; see us for details.
Expires: 08/14/2026
Special Offer
Plus 3% Off When You Pay by Cash or Check
Valid ID required. Applies to service visits. Cannot be combined with other discounts or offers. Ask about our 3% discount when paying by cash or check.
Expires: 12/31/2026
Why us
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Reviews
Real reviews from real Leonard Splaine jobs across Dumfries and Northern Virginia, from same-day AC repairs to full system installs. We've earned our 4.9-star average the slow way: answering the phone, showing up on time, and doing right by every home.
Lynn Gilbertson Google review Kyle provided emergency holiday weekend service when our a/c was completely out with 104F "feels like" temperatures. He quickly diagnosed and fixed our system, with solutions for avoiding similar problems in the future. We are grateful to Kyle and Leonard Splaine!
Katie Kada Facebook recommendation Couldn't have asked for better service! Leonard Splaine was timely, honest and did a wonderful job replacing our very outdated AC unit. We plan to use them again for any service or replacement in the future and we'll recommend them to our friends and family.
I will definitely use this company again! Our AC went out on one of the hottest days of the year. They answered and came to the rescue! Family owned and very kind. Technician was knowledgeable and quick.
Ankur Mundra Facebook recommendation I've used Leonard Splaine the last 5 years. They are professional, provide quality service, and answer my questions and concerns. Michael Ford came out this year to do my spring maintenance as well as eztrap installation and condenser coil cleaning. He did an excellent job.
Candace Bond Google review They were such gentlemen and seemed to be very knowledgeable and honest. They were also very patient and took the time to answer all of our questions. I would highly recommend these guys.
A/C stopped working on the hottest day of the year, so far. They came over the same day and had it up and running in no time. The price was reasonable and the tech was great.
Our Team
Every Dumfries visit is handled by real, named people who treat your home like their own. We're family-owned, 70 years in, and three generations of the same family crew. When you call Leonard Splaine, you reach these folks. Learn more about us.
Ted Leonard 3rd-Generation Owner 
Gary Leonard 2nd-Generation Owner 
Johnny Baker General Manager 
Erin Simmons Office Manager 
Brian Boyce Service Manager 
Brad Hoskins Field Supervisor 
Ira Sacknowitz Install Manager 
Ricky Seminario Comfort Advisor Where we work
Headquartered on Occoquan Road in Woodbridge, Dumfries is part of Prince William County, and our techs cover the surrounding towns every day.
Don't see your town? If you're in Northern Virginia, call us. Odds are we've got a truck nearby.
Good questions
The things homeowners ask us most. Anything else, the phone's faster than the internet.
Yes, and it's a growing part of our week. We tune up and service builder-installed systems, fix the comfort problems new builds often hide, and keep the manufacturer-warranty maintenance documented from year one.
Our shop is on Occoquan Road in Woodbridge, a few miles up Route 1, so Dumfries, Triangle, and Montclair get true same-day service, often same-morning.
In most cases, yes. We run a large fleet out of Woodbridge and hold room in the schedule for same-day repair calls across Northern Virginia. Call before noon and we can almost always be there the same day. Earlier in the day is better during peak season.
For residential HVAC, our diagnostic fee is $89. It covers a real diagnosis and a straight, written price before any work starts. Maintenance members have the diagnostic fee waived when they proceed with the repair. Ask us about the membership. Replacement estimates for HVAC systems, water heaters, electrical panels, and EV chargers are always free.
Yes. We work with multiple financing partners and pass along manufacturer promotions as they run, including 0% and low-monthly-payment options on new systems. Tell us your budget and we'll build options around it.
All of them. Our technicians repair every major brand of furnace, heat pump, AC, boiler, and water heater. For new installations we're a Lennox Premier Dealer and a Mitsubishi Diamond Contractor, including ductless mini-splits, and we also specialize in Carrier.
We do. We're one of the last companies in Northern Virginia that both services oil heating systems and delivers home heating oil and off-road diesel. If you have an oil furnace or boiler, you only need one phone number.
Yes. Alongside heating and cooling we install air filtration, whole-home humidifiers, UV purification, and air purifiers, a big help during Northern Virginia's pollen seasons and dry winters. Ask about it during any air conditioner or furnace visit, or book an air quality assessment on its own.
Yes, and it matters. Leonard Splaine has been owned and run by the same family for three generations, since 1956. We haven't been bought by private equity, and we're not going to be. When you call us, you're dealing with people whose name is on the trucks.
Same-day service across Northern Virginia. Talk to a real person, day or night.
