Furnace Repair in Silver Spring, Maryland
Montgomery County · 24 hour emergency service
Furnace repair and installation in Silver Spring, from garden apartment closets downtown to the 1920s bungalows off Woodside Park. Our office sits on Mount Pisgah Rd in 20903, so this is the heating stock we work on every week from October through March.
Why people here call us.
Most furnace calls in Silver Spring arrive in a narrow window: the first genuinely cold night in November, and then again during the January cold snap. The system ran fine in April, sat idle for six months, and now the thermostat is calling and nothing is coming out of the registers. Sometimes that is a cheap part and an hour of labor.
Sometimes it is a cracked heat exchanger on a furnace that should have been replaced two winters ago, and the honest answer is that the equipment is not safe to keep running. We treat every no-heat call as a safety call first. That means checking combustion, testing for carbon monoxide, looking at the flue and the draft, and confirming gas pressure before we start swapping parts.
Silver Spring runs on Washington Gas for the most part, but there are electric furnaces in the condo and townhouse stock and older houses that were converted off oil decades ago, and each of those changes what we are looking at when we open the cabinet.
What Silver Spring homes ask of this job.
Silver Spring is three heating markets at once. Downtown and South Silver Spring high-rises mostly heat with fan coils or water source heat pumps rather than furnaces, but the garden apartment and townhouse blocks off Georgia Ave and Colesville Rd hide gas furnaces in hall closets and utility rooms with clearances measured in inches.
The 1920s through 1940s bungalows and center hall colonials around Woodside Park, Seven Oaks and Sligo Park Hills are the interesting ones: many started with coal, moved to a gravity furnace, then to forced air, and the furnace sitting there today is the third or fourth generation of equipment venting into a chimney sized for the first. Push out to Four Corners, Woodmoor, Northwood Park and Franklin Knolls and it is mid-century brick, ramblers and split-levels from the late 1940s into the 1960s, most on their second or third furnace with the original trunk duct still in place.
Up toward Hillandale and Kemp Mill in 20903 and 20902 you get that same era with basements finished long afterward, which leaves a furnace heating more square footage than it was ever sized for, through a return path nobody enlarged to match.
The problems that keep coming up.
- No-heat calls on 1990s furnaces in Four Corners ramblers that trace back to a failed ignitor or a flame sensor coated over during summer idling.
- Oversized masonry chimneys in Woodside Park bungalows that never develop proper draft for a modern furnace, leaving condensation and rust inside the vent connector.
- Pressure switches tripping on draft inducer motors with worn bearings, so the furnace lights, runs two minutes, then locks out with a flashing code.
- Limit switches short cycling because a filter has not been changed since spring and the blower cannot move air across the heat exchanger fast enough.
- Condo and townhouse closets where an 80 percent furnace shares a small space with a gas water heater and the combustion air supply is marginal.
How the appointment runs.
A no-heat visit starts with the thermostat and the safeties, not a sales pitch. We verify the call for heat, check the door switch, the filter and the ignition sequence, then read flame signal, gas pressure and temperature rise across the heat exchanger. If the furnace is running, we put a combustion analyzer on it and test for carbon monoxide in the flue and in the room.
Access shapes the visit here. In the Woodside and Seven Oaks houses the furnace sits in a low basement with a chimney connector that is easy to inspect. In downtown and South Silver Spring, a condo or townhouse closet may need the water heater vent checked at the same time, because the two often share one flue. Parking and building access take extra minutes downtown, so we ask about garage entry, loading dock rules and elevator reservations when you book.
What decides the scope here.
Furnace repairs in Silver Spring split cleanly into parts we carry and parts we order. Igniters, flame sensors, pressure switches, limit switches, capacitors, thermostats and transformers are on the truck, and a no-heat call that traces to one of those is normally finished the same visit.
Inducer motors, gas valves and integrated control boards are model specific, and on equipment past about fifteen years old availability is genuinely uncertain, which is a real input into the repair-or-replace conversation rather than a sales angle. Two site conditions change the work more than the fault does. The first is a shared flue, common in the older housing here, where the furnace and the water heater vent into one masonry chimney.
Change the furnace to a high efficiency model that vents through the wall and the water heater is suddenly alone in a chimney sized for two appliances, which is an orphaned water heater and a draft problem, not a detail. The second is combustion air. A furnace in a tight hall closet in a townhouse off Georgia Ave needs air to burn, and closing that closet up during a past renovation is something we find more often than anyone expects.
When this goes wrong in Silver Spring.
Heating calls arrive in two waves here. The first is the opening genuinely cold night in November, when systems that sat idle since March are asked to run and the ones with a weak igniter or a dirty flame sensor do not. The second is the January cold snap, when Silver Spring drops into the single digits for a few mornings and equipment that has been coping all winter stops coping.
Both waves are predictable, which is exactly why a fall check is worth booking in September or October instead of discovering the problem at 11 PM in January. Combustion analysis, a heat exchanger inspection, a draft check and a carbon monoxide test are an hour on a normal weekday in the fall and an emergency call in the winter.
Summer matters too, in one specific way: a furnace that shares a basement with a humid Maryland August develops surface corrosion on the burners and the heat exchanger while nobody is looking at it.
Working in Silver Spring.
Home Comfort Air Services is based in Silver Spring, at 9737 Mount Pisgah Rd in 20903. Yosef started the company in 2014 after years working as a service technician, and it is still family owned and operated. That means the drive to a no-heat call in Woodside, Four Corners or Kemp Mill is a short one, and we are here in January when it matters.
We are NATE certified, Carrier authorized, BBB accredited with an A+ rating and an ACCA member, licensed in Maryland under MD70918. Emergency service runs 24 hours. Military and senior customers get 10% off any repair, and a complete heating and cooling system installation comes with $150 off, with financing available.
Common questions.
My furnace is twenty years old. Should I repair it or replace it?
It depends on what failed and on what the heat exchanger looks like. A blower capacitor or an ignitor on a sound twenty year old furnace is worth fixing. A cracked heat exchanger, a failed gas valve paired with a bad control board, or repeated safety lockouts usually is not. We inspect and run a combustion test before we say either way.
Do I need a chimney liner if I install a high efficiency furnace?
Often you need the opposite of what people expect. A 90 percent or better furnace vents through PVC out a sidewall or through the roof, so it leaves the chimney entirely. The catch in many Silver Spring bungalows is that the gas water heater was sharing that chimney, and the flue is then badly oversized for the water heater alone.
Are there rebates on a new furnace in Silver Spring?
Washington Gas runs residential efficiency rebate programs, and Maryland EmPOWER programs cover a range of heating and cooling upgrades. If you go with a heat pump instead, Pepco residential rebates come into play. The federal 25C credit ended after 2025. Amounts and eligibility change, so we tell you which programs your equipment qualifies for.
How long does a typical no-heat repair take?
Most are between one and two hours, including the diagnosis and testing afterward. An igniter, a flame sensor, a pressure switch or a thermostat fault is usually finished on the first visit because those parts are on the truck. What extends it is a part that has to be ordered against the model and serial number, or a finding that changes the conversation entirely, such as a compromised heat exchanger, which cannot be patched and means the unit does not go back into service.
I think I smell gas. Do I call you or Washington Gas?
Leave the house first, then call Washington Gas from outside. That is their emergency, not ours, and they respond to it around the clock. Do not switch anything on or off on the way out, including light switches. Once the gas utility has made the property safe, call us and we will find what caused it and repair the appliance side. This is the one situation where we would rather you did not call us first.
Does replacing a furnace here need a permit and an inspection?
Yes. Furnace replacement is permitted mechanical work in Montgomery County and the installation is inspected afterward. We pull the permit and schedule the inspection, and it is part of the written price rather than something added later. The inspection works in your favor: it is a second set of eyes on gas piping, venting and vent slope, combustion air, condensate routing and clearances, which are exactly the items a homeowner cannot evaluate and exactly the items that cause trouble a year later.