Furnace Services in Fairfax
Residential Furnace Services in Fairfax Since 1936
A furnace that made it through last winter isn’t certain 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 different from the same problem in September, when you have time to think it through. No heat, uneven temperatures, unusual noises, repeated cycling, and rising fuel use can all signal the need for a clear diagnosis.
Long's Corporation has provided furnace services in Fairfax County and across Northern Virginia since 1936. We offer same-day service for furnace repairs and replacements when available, with warranties on parts and labor and honest assessments our customers have relied on for generations. Financing options are available for eligible repairs, replacements, and installations.
Call (571) 470-5898 or contact us online to schedule furnace services 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 & the Furnace Repair-or-Replacement Decision
Furnace efficiency is measured by Annual Fuel Utilization Efficiency, or AFUE, which describes the percentage of fuel energy converted into usable heat over a heating season. A higher rating indicates less fuel is lost during operation, but the rating doesn’t account for every factor affecting household heating costs.
Equipment condition, home insulation, ductwork, thermostat settings, weather, and fuel prices can all influence actual energy use. Efficiency alone shouldn’t determine whether an existing furnace needs to be replaced.
For Fairfax County homeowners running older equipment, efficiency can factor into the repair-versus-replacement conversation. The decision can also depend on equipment age, the scope and cost of the repair, operating performance, replacement-part availability, and how long you expect to remain in the property. A smaller repair on otherwise dependable equipment presents a different choice than a major repair on a furnace with recurring problems.
We can explain the equipment’s condition and the repair and replacement options so you can make an informed decision. If furnace replacement is the practical choice, Fairfax County generally requires a residential mechanical permit for HVAC replacement and certain related repairs, conversions, duct installation, and gas piping work. Routine furnace maintenance and diagnostic service shouldn’t be confused with a replacement project that requires permitting.
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"Highly Recommend"
I would highly recommend Longs Corporation. They were punctual, diagnosed and fixed the same day. The technician who always comes to our house, Steve, is professional, punctual, and knowledgeable.
Stephanie K. -
"Great Communication"
Their booking process and communication was excellent. When I asked to change the brand of water heater they were very agreeable and promptly made the switch. The technician was efficient, tidy and knowledgeable.
Doreen B.
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.
How Airflow Affects Furnace Operation
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 can run hotter than intended. Repeated overheating can place additional stress on furnace components.
Some restrictions are straightforward to address. Checking the filter and clearing blocked vents are practical first steps. Other airflow problems may involve the blower, duct restrictions, thermostat operation, or the balance between supply and return air.
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. Renovations can leave undersized returns, difficult access points, or connections that no longer match the furnace’s airflow requirements.
At Long's Corporation, we look at the full airflow picture when approaching furnace service, not just the equipment itself. That evaluation helps distinguish a furnace problem from a filter, control, ductwork, or system-balance issue before we discuss the appropriate next step.
Frequently Asked Questions
How Often Should I Schedule Furnace Maintenance?
Maintenance timing depends on the furnace’s condition, manufacturer guidance, usage, prior service history, and the home’s operating environment. Scheduling service before sustained cold weather can provide time to address maintenance or repair needs before the system is working at peak demand.
Why Is My Furnace Making a Loud “Banging” Noise?
A loud bang or pop at startup can indicate delayed ignition, which occurs when fuel ignites later than intended. Dirty burners or an ignition-system problem are possible causes, but the source requires diagnosis. Turn off the furnace and arrange service rather than repeatedly restarting it.
How Long Does a Furnace Replacement Take?
Replacement timing depends on the selected equipment, furnace access, code requirements, and whether the project involves ductwork, gas piping, electrical work, or changes to venting. We can explain the anticipated scope and scheduling after evaluating the existing system.
Can I Call about a Furnace Problem after Business Hours?
You can call and speak with a customer service representative after normal business hours. Service scheduling depends on technician availability, so this call support shouldn’t be interpreted as a promise of after-hours dispatch.
Schedule Furnace Services in Fairfax
From routine maintenance to a no-heat diagnosis or replacement, our trained technicians evaluate the equipment and explain the practical options. Same-day scheduling may be available for repairs and replacements, with financing for eligible work and warranties on parts and labor.
Call (571) 470-5898 or contact us online to schedule your furnace service.
