GEM service team posing together in front of branded vehicle

Revolutionary Standards

The birthplace of American liberty deserves AC service that meets modern expectations.

Lexington’s blend of Revolutionary history and contemporary excellence creates a community that expects quality in everything. When summer humidity arrives and your cooling system fails, the disruption affects families who’ve chosen this town for its schools, safety, and character.

GEM Plumbing & Heating Services, LLC has been solving these problems for New England families since 1949. Our NATE-certified technicians arrive prepared, diagnose accurately, and repair correctly the first time. Same-day appointments, 24/7 emergency response, and honest pricing mean your comfort returns without complications. Call GEM today for air conditioning repair services in Lexington.

(833) 222-2953


24/7 Emergency AC Repairs

Historic significance doesn’t pause for AC problems. Neither do we.

When your system fails overnight or on a weekend, GEM responds. Our technicians are available around the clock.

(833) 222-2953


Call GEM. We’re in Your Neighborhood!

GEM serves all Lexington neighborhoods and surrounding Middlesex County.

Our technicians work throughout town, from the historic homes near the Battle Green to the established neighborhoods of Follen Hill, from properties near the Minuteman Bikeway to the larger homes in the western sections.

Whether you have a colonial on a wooded lot, a contemporary home in a newer development, or a historic property in the town center, we understand the varied housing stock and cooling demands across Lexington. One of New England’s largest HVAC fleets keeps a GEM truck nearby whenever you need us. Need AC repair services in Lexington? Give GEM a call today!

Years in Business

Skilled employees

Emergency Service

Trucks on the Road

GEM technician working on indoor HVAC system with homeowner

(833) 222-2953

It’s Easy to Schedule Your AC Repair With GEM!

Between commuting and family activities, service should be seamless.

We make it that way.

GEM technicians arrive when scheduled, equipped for common repairs.

You see the complete cost before work begins. That’s what you pay.

Our NATE-certified technicians find actual problems and fix them right.

Every repair is tested before we leave.

We Repair All Types of AC Issues in Lexington

Historic homes and contemporary construction present different challenges.

GEM’s air conditioning repair team handles every type of problem Lexington homeowners encounter.

Lexington’s 18th and 19th century homes require thoughtful integration of modern comfort. Our air conditioning repair technicians in Lexington work within historic constraints.

Substantial Lexington properties need properly sized equipment. GEM’s air conditioning repair specialists in Lexington evaluate capacity.

Multi-zone installations sometimes develop coordination problems. Our Lexington team troubleshoots controls and dampers.

Tree cover creates humidity near homes. GEM’s air conditioning repair technicians in Lexington ensure proper dehumidification.

Updated homes may have duct configurations that don’t perform optimally. Our air conditioning repair team in Lexington identifies airflow issues.

Many Lexington homes have systems approaching end of life. GEM provides expert air conditioning repair in Lexington and honest replacement advice.

GEM service vehicles parked outside customer home

(833) 222-2953

GEM Technician Explaining Plans to Customer

(833) 222-2953

Why Work With GEM for AC Repair Services in Lexington?

A community built on high standards deserves service to match.

GEM has delivered since 1949.

500 service vehicles. 700+ employees. GEM has the resources to serve Lexington promptly, whether you’re near the Battle Green or out toward Burlington Road. 

When your system fails during a summer heat wave, GEM offers same-day air conditioning repair throughout Lexington. Colonial homes and mid-century ranches both need fast response when temperatures climb.

Middlesex County families rely on GEM because we consistently deliver quality work. From the historic district to quieter neighborhoods off Route 2A, Lexington homeowners count on our technicians.

The quote we give is the price you pay. No surprises after the work is done.

Heating, cooling, plumbing, electrical. One company for everything your Lexington home needs.


What Our Customers Are Saying

100% Satisfaction Guarantee

4.6
Based on 8686 reviews
Two Gem workers showed up to do annual service on time. Dave and his coworker were friendly, professional and excellent communicators.
The professionals from Gem came to our house to fix a leaky well pump. Fortunately, they diagnosed the problems, and were able to replace our well and tank all in one day. They showed me how bad the pump and tank were, gave us options, gave us estimate. After everything was installed they tested everything to make sure it was in working order. I had a great experience, and I would highly recommend using them. I cannot thank them enough.
Chris and Nem cleaned & checked the parts of my A/C system making sure all was functioning properly. Both helped me have a better understanding of how the unit works & things to consider as upgrades to the HVAC system. Based on their visit I plan to renew my annual maintenance plan.
Quick appointment, resolution and everything‘s working great
Great experience. On time, pleasant and performed work efficiently.
Excellent professional service. Joseph explained everything about our annual A/C maintenance service. He is a fine representative for GEM.
Dovantay was very knowledgeable and professional.Dovantay did a great job.
Was able to get an appt right away and excellent technicians
GEM customer service and technicians are great. They communicate with you, are prompt, courteous and very knowledgible.
Quality work, fast response time. Great staff and incredible technicians.
Thanks for your excellent service.
Scott was kind and very welcomed , explained what the issue could be and recommended few option , he was very thorough and knowledgeable.
Luis and Edwin did an OUTSTANDING job in replacing my old furnace with a new one. They were thorough in every aspect of the job. From removal to the new install and clean up. Very professional and answered any questions I had. I can't thank them enough for the excellent Jobe they performed. 👍👍👍👍
He was on time , very professional, and knew how to correct our plumbing problem9 on
Excellent service, highly recommended. We had a ceiling fan replaced with a chadelier on a cathedral ceiling. It was not that easy, and they did a great job!
Knew his business well, was extremely friendly and patient with me. Overall, just a very pleasant experience.
Anthony Pena was SUPER !

Labor Price was RIDICULOUSLY Overpriced !!!!
Outstanding evaluation of mini split 2 heads and the exterior fan. Excellent service for better maintenance going forward. Detailed inspection and testing of all components including outside line bundles and their likely performance considering deterioration to date. Options, benefits and costs compared and explained. Decisions made and work performed immediately and perfectly!!! Thank you Richard and later for satisfaction follow up. Calling GEM is the best decision I have made as a homeowner. THANK YOU!!! To Eric, Genaro, Jacob, Leo, and your whole team for your superlative work ethic and dedication to the process from of dismantling our 80 year old boiler / hot water system to installation of our new tankless water heater system. And the GREAT clean up also! You are highly trained professionals and finely tuned team. Your attention to every detail and completion of each phase has made me a happy and confident customer.
Knowledgeable and friendly
Technician was very responsive and with great attention to detail.
I've dealt with Carmines for years. Decided to give them another job following their acquisition by GEM. Still the same good-hearted people. Paul came to our house & w/in minutes diagnosed the prob with our mini-split AC system: a clogged drain. He explained everything about the system; did a great job; & was a pleasure to speak with.
I contacted the office later with a billing inquiry later. Sonja in Customer Service resolved my call to my satisfaction. I will do business with GEM Carmine's again.
Josh and Kevin were fantastic. They showed up on time and were very helpful and professional. At every step of the process, they kept me informed. They tested the units and showed me and my wife how to operate and select the functions we like with our remote. Thank You GEM for a great job. Thanks Kevin and Josh for your professional manner and you're great work.
All options were explained with pros and cons of each. The Technician was extremely polite and professional in explaining the options and repairs that were needed.
Very happy with the service. The men were kind, professional, and did quality work. The whole process from booking the appointment to work being finished was very fast.
John was very conscientious

What to Expect When You Work With GEM

Excellence should be standard practice.

At GEM, it is.

Our NATE-certified professionals arrive on time and respect your property.

We explain what’s wrong and present options honestly.

Your price is set before work starts. The invoice matches what you approved.

As a Carrier Factory Authorized Dealer and Mass Save® partner, GEM maintains standards.

GEM Plumbing Heating Cooling & Electrical branded technician portrait

(833) 222-2953

customer and technician interaction

Prevent Future AC Problems With GEM’s Home Comfort Club!

Proactive maintenance protects your investment.

GEM’s Home Comfort Club gives Lexington homeowners annual tune-ups that catch problems before they become failures. Members receive priority scheduling and repair discounts. Contact us to enroll or learn more!


Other HVAC Services You May Need


Schedule Air Conditioning Repair in Lexington, MA With GEM

When your cooling system is not operating the way it should, GEM provides dependable service built on detailed diagnostics and effective repair solutions. Our technicians focus on correcting system issues and restoring reliable cooling performance throughout your home.

From routine service calls to complete air conditioning repair in Lexington, MA, every visit is handled by experienced professionals who emphasize precision, efficiency, and long term reliability.

GEM technician in front of service truck


FAQ

Do you provide same-day AC repair in Lexington?

Yes. GEM offers same-day air conditioning repair throughout Lexington, from homes near the Minuteman Bikeway to properties along Marrett Road.

Can you work on AC in Lexington’s historic homes?

Absolutely. Many Lexington homes date back generations, with original construction that wasn’t designed for central cooling. We’re experienced with the ductwork challenges, insulation limitations, and layout constraints that come with retrofitting AC in historic properties.

What energy rebates are available to Lexington homeowners?

As a Mass Save® partner, GEM helps Lexington residents access rebates on qualifying high-efficiency equipment and system upgrades. We handle the paperwork so you get every dollar you’re eligible for.

Why does my wooded Lexington lot stay humid?

Lexington’s mature tree canopy traps moisture, particularly in neighborhoods with heavy oak and maple coverage. If your home feels clammy even when the AC runs, you may have undersized equipment, drainage problems with your condensate line, or your system may benefit from whole-home dehumidification.

How often should Lexington homeowners schedule AC maintenance?

Annual maintenance is recommended for all Lexington homes. Systems cooling older construction or working against humidity from wooded lots benefit especially from regular professional tune-ups that keep efficiency high and catch wear before it becomes failure.

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