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 Installation Across Lexington
AC Installation in Lexington, MA typically runs $3,500-$7,500 for a complete system, with most projects scheduled within one to two weeks of your free in-home estimate. Our AC Installation team serves Lexington from our Boston office, with crews dispatched daily to neighborhoods from the Battle Green out to Massachusetts Avenue and the Follen Church area. We know the local housing stock here - the 1950s garrison colonials, the raised ranches off Woburn Street, the historic homes near Hancock-Clarke House - and we engineer systems for each one differently. Call (817) 402-2972 for a free estimate with a written, fixed price before any work begins.
Why Coldharbour Heating & Air Is Lexington’s Preferred AC Installation Company
We’ve been the independently owned and operated face of the Kingswell Guarantee in greater Boston since 2003, and Lexington homeowners make up a growing share of our installation work. They come to us after other contractors have walked away from hydronic-only homes or quoted ductwork schemes that would gut a finished basement.
Our reviews from Lexington customers consistently mention two things: we show up in the arrival window we promised, and we hand over a written price before touching a tool. That’s The Kingswell Way - say the price before the work, show up when promised, leave the place cleaner than found, put the guarantee in writing, and come back if it fails.
Response time to Lexington is same-day or next-day for estimates. Our technicians are background-checked, uniformed, and trained on nine major residential HVAC brands including Rheem, York, and Daikin. When you call (817) 402-2972, a live person answers - 24 hours a day, 7 days a week. No voicemail trees. No “call back tomorrow.”
What separates us in Lexington specifically is our fluency with two local realities: the Mass Save rebate program that many of our competitors barely mention, and the Historical Commission review process that can derail an installation near the Battle Green if a contractor hasn’t done their homework. We do that homework before we quote.
Furnace Installation in Lexington
Furnace Installation in Lexington, MA addresses a specific challenge - this town’s dominant housing stock was built with oil-fired boilers and cast-iron baseboard or steam radiators, not forced-air furnaces. When a Lexington homeowner needs a furnace, it’s usually because they’re converting from hydronic heat to a ducted system, often as part of a whole-home electrification or addition project. A typical Furnace Installation in Lexington runs $3,500-$7,500, depending on whether new ductwork is required and whether the job includes AC coil integration.
Converting from Oil Boiler to Gas Furnace
This is the heavy lift in Lexington. We remove the old boiler, patch or repurpose the chimney connection, and design a duct system that fits your home’s framing without destroying finished spaces. In raised ranches, we often use the garage ceiling chase or bulkhead a hallway. Every furnace we install is sized to a Manual J load calculation, not a rule-of-thumb based on square footage.
Furnace-AC Combo Systems
Many Lexington homeowners installing a furnace simultaneously add an evaporator coil and condenser for central AC. We quote this as a single package with one written price, and we handle the Mass Save paperwork if you’re qualifying for a rebate on the heat-pump or high-efficiency gas side.
HVAC Installation in Lexington
HVAC Installation in Lexington, MA encompasses the full scope of heating and cooling system replacement or new-system design, from ducted central air to ductless mini-splits to cold-climate heat pumps. A typical HVAC Installation in Lexington runs $3,500-$7,500, with the upper end representing whole-home ductless systems or complex hydronic-to-heat-pump conversions. Most Lexington homeowners who call us for HVAC Installation are dealing with one of two scenarios: a failed oil boiler in a house with no ductwork, or a desire to electrify for environmental and operating-cost reasons using Mass Save incentives.
Whole-Home Electrification with Heat Pumps
Lexington has among the highest heat-pump adoption rates in greater Boston, driven by affluent, environmentally-minded homeowners and aggressive Mass Save rebates. We engineer these systems for Lexington’s actual conditions: -5°F design heating loads and humid summers in leaky, uninsulated colonials. Cold-climate heat pump selection and low-ambient performance documentation matter here more than in coastal communities.
Ductless Solutions for Historic Properties
Homes near the Battle Green and along Hancock Street present unique constraints - low ceilings, plaster walls, and Historical Commission jurisdiction over exterior alterations. We pre-photograph proposed mini-split condenser placements and file proactively to avoid stop-work orders mid-installation.
Trusted Brands We Service in Lexington
Our technicians are trained to install and service nine major residential HVAC brands: Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard. For Lexington’s specific conditions - coastal salt exposure plus inland cold - we frequently specify Rheem and York units with coated condenser coils and corrosion-resistant cabinets, and we stock Daikin cold-climate heat pumps for the hydronic-to-electric conversions this market demands. Parts availability is local, which means if a warranty issue arises, we’re back with the right component fast. We don’t install equipment we can’t stand behind or can’t get parts for.
Common AC Installation Problems We See in Lexington Homes
- Condenser coil corrosion from salt and road chemicals. Lexington sits far enough inland to lose Boston Harbor’s moderating effect, but close enough to get coastal salt exposure that chews through standard aluminum coils in five to seven years instead of twelve. We specify coated coils as standard here, not as an upsell.
- Undersized systems in leaky garrison colonials. A load calculation that ignores infiltration in a 1962 raised ranch with original windows will produce a system that short-cycles all summer, leaving the house humid and uncomfortable. We measure and seal what we can, then size for reality.
- Historical Commission stop-work orders on mini-split installations. Contractors from Bedford or Burlington who don’t know Lexington’s review process have had jobs halted mid-install when a condenser is placed visible from a public way near the Battle Green. We file before we dig.
- Ductwork forced into homes that should go ductless. Some competitors quote $15,000+ to thread ducts through a finished colonial when a multi-zone mini-split would perform better for half the disruption. We’re honest about when ductless is the right engineering answer.
Pricing for AC Installation in Lexington, MA
We’re upfront about numbers because The Kingswell Way demands it. Here’s what AC Installation and Furnace Installation actually cost in Lexington:
| Service | Typical Range in Lexington |
|---|---|
| AC Installation | $3,500-$7,500 |
| Furnace Installation | $3,500-$7,500 |
What moves you within that range? System capacity, efficiency tier, whether ductwork already exists or must be added, electrical panel capacity, and any Mass Save rebates you’re qualifying for. We don’t quote over the phone based on square footage - we visit, measure, and hand you a written price before any work begins. That price doesn’t change at the door. Estimates are free. Call (817) 402-2972 to schedule.
We Also Serve Cities Near Lexington
Our crews work throughout the Route 128 corridor, and we regularly install systems in Lexington as well as Woburn, Winchester, Burlington, and Arlington. Each town has its own building department, rebate coordination, and in Lexington’s case, Historical Commission considerations - we know the difference and prepare accordingly.
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 Installation in Lexington
Yes, if your property is in the Centre district near the Battle Green and the condenser or line set would be visible from a public way. We pre-photograph proposed placements and file the application before work begins, a step most out-of-town contractors miss. Call (817) 402-2972 and we’ll check your property’s status during the free estimate.
Lexington’s design heating load targets -5°F to 0°F, cold enough that standard heat pumps lose capacity when you need it most. We specify cold-climate heat pumps with documented low-ambient performance and size them to handle full heating load without backup - essential for effective electrification here. Mass Save rebates often apply to qualifying equipment.
Lexington gets coastal salt exposure without Boston Harbor’s moderating protection, plus heavy winter road salt application on routes like Massachusetts Avenue and Woburn Street. That combination degrades uncoated aluminum condenser coils years ahead of schedule. We install coated coils and corrosion-resistant cabinets as functional standard equipment, not optional upgrades.
Yes, but ducted central AC is rarely the best path in homes with no existing ductwork and finished interiors. We typically recommend ductless mini-splits or cold-climate heat pumps for these conversions - better comfort, less demolition, and eligibility for Mass Save rebates that duct-only AC doesn’t qualify for. We installed a Daikin FIT cold-climate heat pump for a 1960s garrison colonial off Massachusetts Avenue near the Battle Green, replacing an oil-fired boiler with cast-iron baseboard and no ductwork. Our tech mapped line-set routing away from the public way to satisfy Historical Commission sightline rules, used a coated condenser coil rated for salt exposure, and commissioned the system at -5°F design conditions. The homeowner qualified for a Mass Save rebate that brought the project in line with our standard AC Installation range.
We recommend coil cleaning and cabinet inspection twice yearly in Lexington - spring before cooling season and fall before heating season if you run a heat pump year-round. Annual maintenance is adequate inland, but the salt load here justifies the extra visit to prevent corrosion-related refrigerant leaks and efficiency loss. Our tune-ups run $80-$200 and include a written report of what we found.
Ready to talk about your project? Call Coldharbour Heating & Air at (817) 402-2972 for a free, in-home estimate with a written price before any work begins. We’re independently owned and operated, part of the Kingswell network since 2003, and we back every installation with our 365-Day Done Right Promise - if anything isn’t right within a full year, we come back and make it right at no charge.
Written by Victor Mancini, Owner at Coldharbour Heating & Air, serving Lexington since 2003.