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 AC Repair Across Lexington
AC repair in Lexington, MA typically runs $150 to $650 depending on the part and the system, and most calls get diagnosed inside an hour. That is the honest number, in writing, before any work starts. If your condenser is short-cycling off Massachusetts Avenue or your third-floor bedrooms never drop below 78°F on a July afternoon, call (361) 306-9515. We’ll tell you what is actually wrong, what it costs to fix, and whether the repair is worth putting money into. Dispatch and scheduling are coordinated from our Boston office; crews serve Lexington locally, and you’ll speak to a live person when you call, day or night.
Why Dalton Heating & Air Is Lexington’s Preferred AC Repair Company
Homeowners in Lexington have dealt with enough no-shows and door-price changes to be skeptical of any HVAC claim. Our answer is written down. Dalton Heating & Air operates under The Garrison Standard, a set of rules that have been in place since 2003: the price goes in writing before work begins, the crew arrives inside the stated window, and every repair carries a written, full-year guarantee. If the work fails inside that year, we return at no charge and fix it. That is the deal on every job, no exceptions and no fine print.
The technicians who come to your home in Lexington are background-checked and uniformed. You’ll know who is showing up before they knock. They are factory-trained to service nine major residential HVAC brands, and they carry the load calculation tools and refrigerant gauges needed to diagnose the mixed-age systems Lexington throws at them: a 2003 Carrier condenser on an 1890s colonial needs different judgment than a 2020 Daikin inverter on a new infill build. Marco Benitez, who leads our team, holds every tech to The Garrison Code: arrive inside the window, do the job by the book, leave the site clean, stand behind the work for a full year.
AC Service in Lexington
AC service in Lexington means preventative work that keeps your system from failing during the first heat wave, and it is the single best money you can put into a 10-to-20-year-old unit before summer hits. In Lexington, cottonwood fluff and leaf litter pack into condenser coils every June. A service call cleans that out, checks refrigerant charge, tests the capacitor, and catches small problems before they become a no-cooling call on a 95°F afternoon. A tune-up in Lexington runs $80 to $200, depending on system age and accessibility.
Refrigerant Recharge
A refrigerant recharge means topping off the cooling fluid your system uses to move heat out of the house. If the charge is low, it is because there is a leak somewhere. A proper service call finds the leak and tests the system under load before adding refrigerant. On older R-22 systems in Lexington’s stock, this is where repair-versus-replace math starts to matter, since R-22 prices climbed after the phasedown and refilling every summer gets expensive fast.
Thermostat Diagnostics
When a Lexington homeowner says the AC “runs but never reaches temperature,” the thermostat is often the first thing we test and the cheapest fix if it is wrong. A miscalibrated sensor, a bad wiring connection, or a heat-anticipator setting that was never adjusted after a retrofit can cause short cycling. We fix wiring and calibration on the spot when possible, and we check compatibility before recommending any replacement, including WiFi thermostats for older homes with low-voltage wiring.
AC Unit Repair in Lexington
AC unit repair in Lexington is real repair work: replacing a failed capacitor, swapping a burned fan motor, fixing a compressor that is pulling too many amps, or repairing a condenser coil that has taken five years of pollen and road dust. A typical repair in Lexington runs $150 to $650. That range covers most capacitor and contactor replacements at the low end, up through condenser fan motors and refrigerant leak repairs at the higher end. Compressor replacement pushes toward the top of that range and sometimes beyond, and we will tell you plainly if the unit’s age means that money is better spent elsewhere.
Capacitor and Contactor Replacement
Capacitors and contactors are the small electrical components that start and run the compressor and fan motor. They fail more often in Lexington because the condensers in older colonials sit outside through freeze-thaw cycles and tree debris, and the electrical load spikes on the first hot week of the season. If you hear a hum from the condenser but the fan is not spinning, or the breaker trips when the system kicks on, this is often the culprit. A capacitor replacement is a $150-to-$300 repair and gets the unit running the same visit.
Compressor and Fan Motor Work
When the compressor itself fails, the repair is more involved, and the honest conversation gets harder. We weigh in the refrigerant charge that is right for the compressor, the condition of the evaporator coil, and whether the unit’s SEER2 rating still makes sense on a Lexington electric bill before we ask you to spend money on a new compressor. Fan motor failures are simpler: a seized or burned motor get swapped, blades get balanced, and the grill and hardware get checked for rust and vibration.
Trusted Brands We Service in Lexington
Our AC Repair team is factory-trained on nine major residential brands: Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard. That matters in Lexington because the housing stock is so varied. A 1990s Rheem on a split-level near Woburn line and a late-model Daikin heat pump on a newer build by the reservoir both need techs who know the specific control boards, refrigerant types, and diagnostic sequences. We stock common Goodman, Rheem, York, and Daikin parts locally, so our Lexington customers are not waiting two days for a delivery from a wholesaler when a capacitor or pressure switch is the fix.
Common AC Repair Problems We See in Lexington Homes
- Cottonwood and leaf litter packed into the condenser coil. Lexington’s older tree canopy, especially along Massachusetts Avenue and the neighborhoods west of Woburn Street, drops an enormous amount of cottonwood fluff in June. It packs the condenser coil, drives head pressure up, and trips the high-pressure switch on the first hot week. The fix is a coil rinse and, often, a capacitor that failed under the strain.
- Failed run/start capacitors on 10 to 20-year-old condensers. In Lexington’s older colonials and ranches, the compressor is frequently still in good shape while the capacitor has given up. A $150 to $650 repair correctly beats a $3,500 to $7,500 replacement here, and we will tell you that plainly.
- Undersized or improperly charged attic and third-floor retrofits. Pre-war homes in Lexington that got central air added to an attic or a third-floor space often have duct static pressure and evaporator airflow problems from day one. The system short cycles, the rooms never cool, and the fix is usually airflow correction, not more refrigerant.
- Refrigerant leaks on older R-22 systems. An 1890s colonial near the Battle Green with a 20-year-old R-22 condenser that is losing charge every summer is a classic Lexington repair-or-replace decision. We find the leak, quote the repair honestly, and show you the repair cost next to the replacement cost before you decide.
Pricing for AC Repair in Lexington, MA
Here is the line-item reality for Lexington. Most AC repairs land between $150 and $650. A capacitor or contactor replacement runs $150 to $300. A condenser fan motor is typically $350 to $550. Refrigerant leak location and repair often lands between $400 and $650, before refrigerant. A tune-up runs $80 to $200. A full AC installation in Lexington runs $3,500 to $7,500 depending on system size, efficiency, and duct condition. Every quote is in writing before any work begins, and every repair carries our full-year written guarantee. Call (361) 306-9515 for a free estimate.
| Service | Typical Range in Lexington |
|---|---|
| AC Repair | $150 – $650 |
| AC Installation | $3500 – $7500 |
| Tune-Up | $80 – $200 |
We Also Serve Cities Near Lexington
Beyond Lexington, our crews cover Woburn, Winchester, Burlington, and Arlington. If you are in one of those towns and need AC Repair, call the same number: (361) 306-9515. We run the same written pricing and the same full-year guarantee across the whole service area. When you call for AC Repair in Lexington, you get that same standard, every time.
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 AC Repair in Lexington
That comes down to the compressor’s age, the refrigerant type, and the condition of the rest of the system. If the unit is 10 to 15 years old and the problem is a failed capacitor, a worn contactor, or a clogged coil, repair at $150 to $650 is the right call and we will say so. If the compressor has failed on an R-22 system from 2003 or earlier, replacement at $3,500 to $7,500 may be the honest answer. Lexington’s older homes often have compressors that outlast their capacitors, and we will not sell you a replacement when a repair gets you another two summers. Call (361) 306-9515 and we will put the numbers in writing.
The most common cause in Lexington is a dirty condenser coil loaded with cottonwood fluff and leaf litter. By the time the first sustained hot stretch arrives in July, the coil cannot reject heat, head pressure climbs, and the system either trips its high-pressure switch or runs constantly without hitting setpoint. A coil rinse and a check of the capacitor and refrigerant charge usually fixes it. That service call runs $80 to $200 for the tune-up portion, with repairs quoted in writing if something else is failing.
A load calculation, often called a Manual J, measures the actual heating and cooling load of your Lexington home based on square footage, window area, insulation, orientation, and duct condition, instead of a rule-of-thumb guess. On an 1890s colonial with original windows and a third-floor retrofit, a proper load calculation frequently changes the recommended system size by half a ton or more, which affects both the installed price and the long-term electric bill. We include this on every installation quote in Lexington, not as an add-on, because a system sized by guesswork short cycles and never dehumidifies properly.
Yes, and the number shows up on your bill every month from June through September in Lexington. SEER2 is the current federal efficiency metric for residential air conditioners and heat pumps. A single-stage unit from 2005 might operate around 8 or 9 SEER2 equivalent, while a modern inverter heat pump can run above 16 or 18 SEER2. On a typical Lexington colonial with central air, the difference can be $35 to $90 a month during the cooling season. The higher SEER2 rating costs more upfront, and we will show you the payback math on your actual usage before you choose.
Our techs are factory-trained to service nine residential HVAC brands: Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard. We commonly repair Goodman units on 1990s splits, Rheem condensers on mid-century ranches, York systems in 2000s builds, and Daikin heat pumps in Lexington’s newer infill construction. If your system is one of those, call (361) 306-9515 with the model number and we will have the right parts on the truck before we arrive.
Same-day in nearly all cases. Because our Boston office dispatches crews locally to Lexington, and because we stock common capacitors, contactors, pressure switches, and fan motors locally, a no-cooling call on Massachusetts Avenue or in a neighborhood off Woburn Street gets a technician the same day, often within a few hours. If the first hot afternoon of June knocked out your system, call (361) 306-9515 as soon as you notice it. A real person picks up, day or night, and we will give you a window, not a voicemail queue.
We cover all of Lexington, including the Battle Green area, neighborhoods along Massachusetts Avenue, the Woburn Street corridor, and the newer infill builds near the Arlington and Burlington lines. Lexington’s housing stock varies block to block, from 1890s colonials to 1990s builds, and our techs know both systems. The call works the same everywhere in town: written price, written guarantee, same standard.
Written by Marco Benitez, Owner at Dalton Heating & Air, serving Lexington with written pricing and a full-year guarantee on every repair.