Looking for an HVAC company in Annandale? Annandale's brick ramblers under the oaks are inside-the-Beltway classics, and most are heating and cooling with systems their builders never imagined. We've serviced them for decades, straight up Braddock or Little River Turnpike.
Why us?
Serving Annandale
Annandale is one of Fairfax County's oldest suburbs, brick ramblers and split-levels from the 1950s in Broyhill Crest and Columbia Pines, under a canopy that's had seventy years to mature. Many of these homes were built with radiators or gravity furnaces and no ducts at all; central air came later, retrofitted into attics and crawl spaces with varying degrees of care.
That history defines the work: retrofit ductwork that whistles and starves the back bedrooms, boilers still faithfully heating homes their owners love, additions and in-law suites that need their own conditioning, and panels that filled up decades ago. Annandale's also a hub of multi-generational households and home businesses, so comfort isn't a nine-to-five problem here.
We've been in business roughly as long as Annandale's been a suburb, and the approach hasn't drifted: straight prices, an $89 diagnostic that comes off your bill when you approve a repair over $250, and a phone that a real person answers at any hour. Ramblers, split-levels, or the newer infill, one call covers it.
Our Services
Cooling, heating, boilers, and ductless retrofits for the neighborhoods under the oaks.
Annandale's retrofitted central air fails in retrofit ways: attic air handlers cooking themselves in July, undersized returns choking airflow, and condensate pans dripping through bedroom ceilings. We run same-day repairs across Broyhill Crest, Columbia Pines, and Sleepy Hollow, and we diagnose the retrofit, not just the box.
Annandale still heats with everything its seventy years have accumulated: gas furnaces, heat pumps, honest-to-goodness boilers with cast-iron radiators, and the occasional oil system. We repair all of it the same day, and we're one of the last companies around that still services boilers and oil heat properly.
Replacing HVAC in an Annandale rambler is a design job: the retrofit ducts are often the real problem, and the right answer might be better ductwork, a properly sized conventional system, or skipping ducts entirely with ductless. We quote what the house actually needs, free and in writing, with no pressure attached.
No neighborhood we serve suits ductless better than Annandale: radiator-heated homes with no ducts, finished attics, in-law suites, and home offices all get their own quiet, efficient zone. As a Mitsubishi Diamond Contractor we've put mini-splits into hundreds of homes like these without disturbing the plaster.
For Annandale homes ready to move past window units or aging retrofits, modern heat pumps, ducted or ductless, are the efficiency play. We repair every brand and install high-efficiency inverter systems that handle both our muggy summers and the cold snaps, with dual-fuel options where gas is staying.
Seventy-year-old oaks mean pollen, seeds, and leaf litter packing Annandale condensers every season, and attic air handlers that suffer silently until August. Our tune-ups clean and test the whole chain, and maintenance plan members get priority scheduling and 15% off repairs.
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 Annandale customer, every day.
Special Offer
Priced After the Year We Started
A one-time heating-system inspection with a straight report on what we find and a written price on anything that needs work. We set the price at $56 because 1956 is the year our family started this company. Covers one residential system. Mention this offer when you book.
Special Offer
Pay for the Repair, Not the Visit
The $89 residential service call comes off your bill when you approve a repair over $250 on the same visit. Maintenance members have the service call waived on any repair they approve, with no minimum.
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
Or 0% Financing for 60 Months
Rebate paid as a Lennox Prepaid Mastercard® on a qualifying Ultimate Comfort System™ with a qualifying thermostat. Or combine up to $1,400 with the same 60-month financing. Buy by December 4, install by December 11, 2026. Financing subject to credit approval.
Expires: 12/04/2026
Special Offer
Not valid on tankless or heat pump water heaters. Exclusions apply. Mention this offer when you book.
Special Offer
Not valid on tankless or heat pump water heaters. Exclusions apply. Mention this offer when you book.
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 Annandale 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 Annandale 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, Annandale is part of Fairfax 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.
Book now
Same-day appointments available. We'll call you right back.
Good questions
The things homeowners ask us most. Anything else, the phone's faster than the internet.
Yes, happily. We're one of the last companies in the area that properly services boilers and radiator heat, and we can pair that system with ductless mini-splits for cooling so you keep the radiant heat people love.
That describes half of Annandale, and yes. Depending on the house, the answer is ductless mini-splits, a compact ducted system in the attic, or a combination. We quote the real options rather than forcing one.
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. Approve a repair over $250 on the same visit and the $89 comes off your bill, whether or not you are a member. Maintenance members have the fee waived on any repair they approve, with no minimum. 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.
