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Ask three neighbors in Sudbury what heats their house and you could hear gas, oil, and propane. Natural gas isn’t available on every road in town, so what’s in your basement usually comes down to your street and the year the house went up. That’s why the first question after your furnace quits is what it burns, not what brand it is.
With gas furnace repair in Sudbury, MA, we check the igniter, the flame sensor, and the gas supply. On an oil system, the same visit covers the burner, the fuel line, and the tank. We started as an oil company in 1992 and now work on gas, oil, and electric furnaces, so you make one call instead of figuring out which company handles your setup.
Then there’s the house itself. Most Sudbury homes went up between the 1950s and 1970s, and plenty of them are big colonials with several zones and long duct or pipe runs. When the problem is diagnosed properly, the far bedroom wing warms up again and the system stops running all afternoon trying to catch up. With kids at home, a warm upstairs is the whole point.
We’re family-owned and started in 1992 as an oil company. We’ve since grown into licensed HVAC, plumbing, and electrical work, with more than 12,000 customers along the way. That oil background is why an older burner in the basement doesn’t throw our technicians off.
Residential furnace repair in Sudbury, MA covers a wide spread of houses, from the old homes around Sudbury Center, where the historic district has changed little since about 1800, to the colonials and capes on one-acre lots that fill out most of town. Different eras mean different equipment, and you want someone who has seen all of it.
A live person answers the phone at any hour. Jobs are tracked and followed up on, so if something isn’t right after the visit, there’s a record and a real person to take it up with.
It starts with the call. We’ll ask what the furnace is doing, what fuel it uses, and roughly how old it is. If you have a furnace not heating in Sudbury, MA, that fuel answer sets the direction before anyone drives out.
If you can spare a few minutes first, basic furnace troubleshooting in Sudbury, MA sometimes saves the visit. Check that the thermostat is on AUTO, look at the filter, and confirm the breaker and fuel supply. If you smell gas or see soot, skip the checklist and call right away.
When you book, the $99 dispatch fee is collected and covers a 15-minute diagnostic. If our technician finds the problem in that window and you go ahead with the repair, the fee is waived. If diagnosing takes longer, the $99 still applies, so you know that going in.
The truck is stocked, so there’s a good chance the part is on board, though that’s never a promise. Our technician works out whether the problem is the equipment or the supply, runs a combustion analysis and heat exchanger inspection where it makes sense, and explains your options in plain terms. You decide what happens next.
If a repair turns into a replacement, Sudbury’s Building Department gets involved. We hold the permit, and inspections have to be requested at least 24 hours ahead on a weekday.
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We work on gas, oil, and electric furnaces, and also handle oil burner service, boiler repair, and furnace maintenance in Sudbury, MA. That includes oil burner cleaning and adjusting, heat exchanger inspection, and combustion analysis. We mention boilers because some Sudbury homes heat with radiators instead of ducts, and those homeowners shouldn’t have to wonder if we can help.
Emergency furnace repair in Sudbury, MA runs 24/7. Nor’easters and blizzards are when phones fill up, and a February 2026 storm cut power to about 290,000 Massachusetts customers at its peak. Sudbury has roughly 160 miles of roads, and whether you’re on Boston Post Road, Union Avenue, or one of the winding country roads in between, a stocked truck means fewer second trips.
Dempsey Comfort Club is the membership program we built for those stretches. Members get priority servicing, a free annual tune-up appointment, 10% off parts, 10% off labor, and 24/7 emergency service. A standalone tune-up typically runs $150 to $200 nationally, according to Angi, so the free annual visit has real value on its own.
Whether you found us searching furnace repair near you or got our name from a friend, the first call works the same way.
Yes. We began as an oil company in 1992 and work on gas, oil, and electric furnaces, so you aren’t stuck figuring out which kind of company to call. That matters in Sudbury, where gas, oil, and propane all heat homes and natural gas isn’t available on every road.
The fuel changes what we check. On a gas furnace, the usual suspects are a failed igniter or a dirty flame sensor. On an oil system, it’s more often the burner, a blocked fuel line, or soot. Before anything gets taken apart, the first job is working out whether the equipment or the fuel supply is the problem, because an empty tank looks a lot like a broken furnace at 6 a.m.
If your system runs on propane, mention it when you call so we can confirm what we can do before you book.
Start with the thermostat. If the fan is set to ON instead of AUTO, the furnace can blow cool air between heating cycles, which feels like a failure but isn’t one. Next, check the filter. A clogged filter can overheat the furnace and trip a safety switch that shuts it down.
Then look at the basics: the furnace’s power switch, the breaker, and the fuel supply, meaning the gas valve is open and the oil tank isn’t empty. It’s also worth checking after a nor’easter outage, since furnaces sometimes fail to restart when power returns.
Stop there. A dirty flame sensor or a lockout after failed ignition is a technician’s job. If you smell gas, see soot, or your carbon monoxide alarm sounds, get everyone outside and call from there.
Nationally, Angi’s data from more than 27,000 projects puts the average furnace repair at $318, with most homeowners paying between $133 and $505. The full range runs from $64 to $1,475. An ignitor, the part that fails most often, costs $150 to $250 to replace, and after-hours calls can push that to $350 to $500. These are national figures, not our quotes, but they give you something to check any estimate against.
The $99 dispatch fee is collected when the appointment is set and covers a 15-minute diagnostic. If our technician finds the problem within that window and you proceed with the repair, the fee is waived. If diagnosis takes longer than 15 minutes, the $99 still applies.
After-hours work costs more across the industry. Dempsey Comfort Club members get 10% off parts and 10% off labor, which helps when a breakdown lands at night.
Age and repair cost decide most of it. Gas furnaces typically last 15 to 20 years, and ENERGY STAR suggests considering replacement after 15. A common rule of thumb says to replace when a repair would cost more than half the price of a new unit, or when you’re fixing the same system every year.
So a furnace under 15 years old with a small problem usually just needs the repair. A 20-year-old unit with repeated failures is a different conversation, and our technician should say so plainly.
In Sudbury, you’ve probably seen the town’s energy pages and local groups promoting heat pumps and Mass Save assessments, and some contractors push replacement hard. If you’re weighing a heat pump, that’s a bigger decision than a repair visit. Get the repair numbers from us so you’re comparing real figures, and take your time. Estimates are free, no pressure.
A tune-up won’t guarantee your furnace never breaks, but it catches small problems, like a dirty flame sensor or a worn part, before they turn into a shutdown. Angi puts a yearly tune-up at about $150 to $200 and recommends replacing filters every 90 days. Some manufacturer warranties also expect regular maintenance, so check yours.
It matters in Sudbury because so many houses are big, with long duct runs and several zones, which means the system works harder. The town’s median build year is around 1976, so plenty of homes are probably on their second or third furnace, and age adds up.
With Dempsey Comfort Club, the annual tune-up appointment is free, along with 10% off parts, 10% off labor, and priority servicing. That puts furnace maintenance in Sudbury, MA inside the membership instead of leaving it as one more thing to remember to book.
We don’t list group-specific discounts, so the savings that apply here come through Dempsey Comfort Club: 10% off parts and 10% off labor, plus a free annual tune-up appointment and priority servicing.
It fits Sudbury well. About nine in ten homes in town are owner-occupied, so most people here plan to stay put and keep the same systems running for years. If you’re going to own that furnace for a decade, 10% off every part and labor charge adds up. The free tune-up each year also helps small problems get caught before they become repair bills.
Priority servicing is the other piece. When a cold snap or a storm has a lot of households calling at once, members get priority scheduling.
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