Furnace Services in Fairfax, VA
Residential Furnace Repair, Maintenance, & Replacement in Fairfax County & Northern Virginia
A furnace that made it through last winter isn't guaranteed to make it through this one. The coldest stretches of the season are when heating systems work the hardest, and when components already worn down by age or deferred maintenance are most likely to give out. A furnace problem in January, with temperatures in the teens and a household depending on heat, is very different from the same problem in September, when you have time to think it through.
Long's Corporation has serviced residential furnaces across Fairfax County and Northern Virginia since 1936. We offer same-day service for repairs and replacements when available, with warranties on parts and labor and honest assessments our customers have relied on for nearly 90 years.
Call (571) 470-5898 or contact us online to schedule furnace service in Fairfax, VA.
Your home deserves reliable comfort and dependable plumbing. Our financing options help make repairs, replacements, and installations easier to manage. Apply today and take the next step toward a more comfortable home.
AFUE Ratings & How Furnace Efficiency Has Changed
Furnace efficiency is measured by Annual Fuel Utilization Efficiency, or AFUE, which tells you what percentage of the fuel your furnace consumes actually becomes heat delivered to your home.
Furnaces from the 1970s and 80s typically ran at 60 to 65 percent AFUE, meaning up to 35 cents of every heating dollar was lost up the flue. Today's federal minimum for new gas furnaces is 80 percent AFUE, and high-efficiency condensing units push that number to 95 or 98 percent.
For Fairfax County homeowners running older equipment, that efficiency gap is wide enough to factor meaningfully into the repair-versus-replace conversation. A furnace that needs a significant repair at 18 years old may well cost more to keep running over the next few years than a new unit would. We'll walk you through the numbers honestly so you can make the call that actually makes sense for your situation.
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"Honest Company"
We switched to Long's Corporation from another company after a family member recommended Long's, and I'm so glad we did. They provided quick, caring, thorough, and honest service at fair and affordable prices.
Whitney H. -
"Excellent Experience"
I had an excellent experience with Long’s corporation. Plumbing work was outstanding, and I will say very reasonable. I would definitely use them again, as I was thoroughly satisfied from beginning to end.
Dale H.
Why Choose Us?
Benefits of Working With an Expert Team
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Immediate, Same-Day Service
Some things can't wait. We can come see you today!
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100% Satisfaction GuaranteeWe never leave you unhappy! We guarantee it.
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Hablamos EspañolOur team is proud to help with Spanish services.
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Women-Owned Company
Three generations of woman-owned leadership.
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Affordable Financing Options
We make services affordable with financing options.
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24/7 Call Support Available
We're here to help you whenever you need us.
The Role Airflow Plays in Furnace Longevity
A furnace needs consistent, unobstructed airflow to operate safely and within the temperature ranges it's designed for. When airflow gets restricted, whether from a clogged filter, blocked return vents, or closed supply registers, the heat exchanger runs hotter than it should. Repeated thermal stress causes the metal to expand and contract beyond its tolerance, and over time, it's one of the most common ways heat exchanger cracks develop.
The good news is that it's largely preventable. A clean filter and clear vents go a long way and cost very little. In older Fairfax County homes where ductwork has been added to or modified over the years, the airflow issue may be less obvious and harder to spot without a proper inspection.
At Long's Corporation, we always look at the full airflow picture when approaching furnace service, not just the equipment itself. That way, we can make sure you get the repairs you need to keep your furnace working the way you depend on it.
Frequently Asked Questions
What are the signs that my furnace's heat exchanger is cracked?
A cracked heat exchanger is a serious safety hazard as it can leak carbon monoxide into your home. Warning signs include a flickering yellow flame (instead of a steady blue one), excessive soot inside the unit, or a strong, unpleasant odor. If you notice these symptoms, turn off the unit and call Long's Corporation immediately.
Why is my furnace making a loud "banging" noise when it starts?
A loud bang or pop usually indicates a delayed ignition. This happens when gas builds up before the ignitor finally catches, causing a small explosion. This is often caused by dirty burners or a faulty pilot light and should be addressed quickly to prevent damage to the combustion chamber.
How long does a typical furnace installation take?
A standard furnace replacement in a Fairfax residence usually takes between 4 to 8 hours. If the project requires new ductwork, gas line relocation, or transitioning to a high-efficiency venting system, it may take longer. We always aim to have your heat back on by the end of the business day.
Don’t let a broken furnace leave you out in the cold. Call (571) 470-5898 or contact us online to schedule furnace service in Fairfax, VA.
