Seasonal tune-up and full diagnostic on your Carrier, Trane, or Goodman system - readings shown to you before any repair is proposed
Diagnosis first, numbers second - you approve the repair price before a single part goes in.
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AfterFast, Reliable Furnace Repair Across Lexington
Furnace repair in Lexington, MA typically runs between $150 and $700 depending on the part that failed, and most jobs are completed in one visit. That’s the honest range you should expect before anyone steps into your home. If a company quotes you a number that feels vague or refuses to put it in writing, that’s a signal to keep looking. We’ve worked on enough heating systems in Lexington to know exactly what goes wrong in these homes, and we’ll tell you the truth about what’s causing the issue before any repair begins. Call (361) 306-9515 to schedule service.
Our dispatch team coordinates Lexington service locally from our Boston office, so when you call, a live person answers and a Dalton technician from our team reaches your street fast. No voicemail queues. No waiting half the day for a callback. You tell us what your furnace is doing, we give you a straight answer on the phone, and then we show up inside the window we promised.
Why Dalton Heating & Air Is Lexington’s Preferred Furnace Repair Company
Lexington homeowners have been burned before. A technician says 9:00, shows up at noon. The price quoted over the phone suddenly doubles at the door. The repair holds for three weeks, then the same problem returns. Dalton Heating & Air operates under a different rule set. The Garrison Standard, binding every one of our service calls since 2003, requires four things: arrive inside the stated window, put the price in writing before any work starts, do the job by the book, and stand behind the repair for a full year. That’s not marketing copy. That’s our operating code.
Marco Benitez leads our service crew with the same expectation on every Lexington job: if the repair fails within 365 days, we return at no charge and fix it again. The guarantee is written, not promised. Every repair includes it. You’ll also know who is coming to your door before they arrive. Background-checked, uniformed technicians only. Not a subcontractor. Not a guy with a truck and a handshake.
Our furnace repair team carries parts for Trane, Lennox, Goodman, and Rheem systems on the truck, so a lot of Lexington jobs are completed the same day without a follow-up visit. For older furnaces where specific parts are no longer manufactured locally, we’ll tell you that upfront and give you the repair-versus-replace math before you spend a dollar.
Heating Repair in Lexington
Heating repair in Lexington covers the work needed to get your furnace producing and distributing heat again: ignitors, flame sensors, gas valves, pressure switches, blower motors, and the electrical controls that run them. A typical heating repair for a Lexington home runs $150 to $700. When your furnace quits in January, the last thing you want is a company that sends you to a call center or schedules you three days out. Our team stocks common replacement parts and dispatches to Lexington the same day for no-heat calls.
Diagnostic Approach
Every heating repair starts with the same discipline: we measure before we replace. That means checking gas pressure, electrical draw on motors, and static pressure in your ductwork before quoting a repair. In Lexington homes, especially older ones, skipping this step is exactly how homeowners end up paying for a blower motor that fails again six months later. The measurement tells us why the part failed, not just that it failed.
Common Heating Repair Costs
An ignitor replacement typically lands around $150 to $300. A gas valve runs higher, often $250 to $500. Blower motor work generally falls between $200 and $450. You’ll know the exact price before we turn the first screw. Written. Firm. No hourly billing surprises.
Boiler Repair in Lexington
Boiler repair in Lexington involves fixing the heat exchanger, circulator pump, zone valves, expansion tank, or controls on hot water and steam boilers. Many homes in Lexington’s older neighborhoods still run on original boilers, some converted over the years from coal, and the work differs from forced-air furnace repair. A typical boiler repair runs $150 to $700. Boiler systems are less common than forced air in Lexington overall, but in the Colonial-era homes around the Battle Green and Munroe Hill, they’re still substantial.
Weak Points We See
The circulator pump on older Lexington boilers tends to seize after years of mineral buildup in the water. Zone valves wear out and stop opening, leaving specific rooms cold while the rest of the house heats fine. Expansion tanks fail silently; the result is a pressure relief valve that drips constantly. These are all diagnoses we can make quickly, and the long-term fix often means replacing the part, not the whole system.
Boiler-Specific Service
Boiler work requires patience. Systems hold water, and water hides what air doesn’t. Our technicians test system pressure, check air bleed points on each radiator, and verify actual supply temperature at the boiler outlet before calling a repair complete. For Lexington boilers that are original to the house, we also check combustion; older burners can run rich and waste fuel even when they still heat the home.
Trusted Brands We Service in Lexington
Dalton Heating & Air is factory-trained on nine major HVAC brands, and for Lexington furnace and boiler work we regularly service Trane, Lennox, Goodman, and Rheem equipment. That training matters. Each brand uses different control sequences and diagnostic protocols, and a tech who doesn’t know the difference may misdiagnose a board issue as a motor failure. We carry common replacement parts for these brands on our trucks and can source less common components quickly for Lexington customers. That means fewer two-day waits and fewer return trips.
Common Furnace Repair Problems We See in Lexington Homes
- Heat exchangers cracking in older Lexington homes. When return ducts are undersized for the size of the furnace, the system runs hot and short-cycles. That repeated thermal stress on the metal is what cracks heat exchangers. Homes around the Battle Green with original 1920s ductwork are particularly prone, and we check the exchanger on every tune-up and no-heat call.
- Blower motors failing early from high static pressure. Renovations over the years often add runs of duct that were never designed for the system. The resulting pressure forces the blower motor to work beyond its rating, and it burns out prematurely. In Lexington, easy to spot in Colonials and raised ranches where rooms were converted or extended.
- Thermostat calibration drifting after seasons of wide temperature swings. Massachusetts heating seasons are long and New England shoulder seasons are unpredictable. Over time the thermostat’s internal sensor drifts, so the furnace cycles on wrong setpoints. You think the furnace is failing. In reality the control is the problem. We recalibrate or replace, and in most cases the furnace itself is fine.
- Ignitors and flame sensors failing from dust and short cycling. Lexington homes generate a lot of dust in a dry winter, and furnaces with undersized returns pull more of it through the system. The flame sensor gets coated, the furnace locks out, and suddenly it’s a no-heat call for a $150 part.
Pricing for Furnace Repair in Lexington, MA
Here’s what you can expect to pay for furnace repair in Lexington:
| Service | Price Range |
|---|---|
| Furnace Repair | $150 – $700 |
| Boiler Repair | $150 – $700 |
| Heating Repair | $150 – $700 |
| Tune-Up | $80 – $200 |
What moves a job from the low end to the high end is the part, not the labor. A flame sensor costs less than a gas valve. A blower motor costs less than an inducer assembly. You’ll get the exact part price and labor cost in writing before any work begins. If we find something that changes the repair scope, we stop and tell you. You approve any new number before we proceed. Free estimates are standard on every job, including same-day no-heat calls in Lexington.
We Also Serve Cities Near Lexington
Dalton Heating & Air serves Lexington and the surrounding communities of Woburn, Winchester, Burlington, and Arlington. If you’re searching for Furnace Repair and you’re just outside Lexington proper, call us anyway. Our technicians are already routed through this area throughout the week, and the same pricing and written guarantee applies.
Serving Lexington, MA - Our Local Coverage Area
We’re based in the Lexington area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About Furnace Repair in Lexington
Yes. A Manual J load calculation is necessary before any responsible furnace replacement in a Lexington home with original or altered ductwork. The calculation measures heat loss by room, window area, insulation, and house orientation. Skip it and you end up with a furnace that’s the wrong size for the actual heat load; Lexington homes with ductwork sized for radiators converted decades ago are exactly where mistakes get made. We run the calculation on every replacement quote and show you the numbers. Call (361) 306-9515 to schedule a no-obligation assessment.
Most furnace repairs in Lexington run between $150 and $700. Ignitors and flame sensors sit at the lower end, gas valves and blower motors at the higher end. The exact price depends on which part failed, and because we write the price down before starting, you’ll know that number before any work gets approved. Free estimates apply to every service call.
SEER2 is the updated federal efficiency standard for cooling equipment, including the heat pump side of a dual-fuel system. For a furnace, the equivalent efficiency metric is AFUE. In Lexington, the practical question is what your actual heating bill reflects: an older 80% AFUE furnace wastes 20 cents of every fuel dollar. When repair costs start exceeding 40% of replacement cost on a system that age, replacement with a higher-efficiency unit starts making genuine sense. We’ll show you the payback math using local Lexington utility rates, not national averages.
The rule is straightforward: if the repair is under $500 and the furnace is under 15 years old, repair it. If the repair is over $500 and the heat exchanger is cracked or the blower motor is the second failure in two years, replacement deserves a hard look. Older Lexington homes with undersized ductwork complicate that decision. Sometimes the fix is not the furnace at all; it’s the static pressure correction we described in the field vignette on Hancock Street. We’ll tell you if your system can be saved. Call (361) 306-9515 for an honest assessment with the numbers in front of you.
Short cycling after a repair usually points to one of three causes: high static pressure from undersized or altered return ductwork, a thermostat that’s drifting out of calibration, or an oversized furnace running hard on mild winter days. Lexington homes with original ductwork converted from radiators frequently show high static pressure (one home off Munroe Hill measured 0.9 inches of water column before correction). Our diagnostic process measures static pressure on every no-heat and short-cycle call, so we identify the actual cause instead of swapping parts. Call (361) 306-9515 and we’ll diagnose it properly.
What Makes Lexington Furnace Repair Different
Lexington’s housing stock spans 1890s Colonials to 1990s builds, and the older homes around the Battle Green and Buckman Tavern almost never have ductwork sized for modern furnaces. A proper load calculation in these homes often reveals a system that’s oversized on paper but starved for return air. That combination means many furnaces that look “failed” are actually heat exchanger and static pressure victims, not worn-out equipment. Other companies will quote a full replacement when the real fix is a return duct correction and a capacitor. We got a no-heat call from a homeowner on Hancock Street in the Munroe Hill area. It was a 1920s Colonial, originally radiators, converted to forced air at some point. Their Carrier furnace was short-cycling and the blower motor was pulling high amps. A static pressure test showed 0.9 inches of water column because the return trunk was too small for the space. We replaced the capacitor, corrected the return duct, and recalibrated the thermostat. The system now runs full cycles and that homeowner avoided a premature replacement. That’s what local knowledge delivers in Lexington: the correct fix, not the most expensive one.
Written by Marco Benitez, Owner at Dalton Heating & Air, serving Lexington since 2003.