New High-Efficiency Hot Water System + One Year of Free Home Comfort Club

GEM service team posing together in front of branded vehicle

Dependable AC Repair for Waltham Homes

Charles River valley humidity and a mix of old and new construction keep AC systems busy.

Waltham’s got everything from Victorian homes near Moody Street to mid-century ranches in South Waltham to newer condos along the tech corridor. When summer humidity settles over the river valley and your cooling system fails, the disruption affects everything from sleep to productivity.

GEM Plumbing & Heating Services, LLC has been solving these problems for New England families since 1949. Our NATE-certified technicians diagnose accurately and repair correctly the first time. Same-day appointments, 24/7 emergency response, transparent pricing. Call GEM today for air conditioning repair services in Waltham.

(833) 222-2953


24/7 Emergency AC Repairs

Research labs and family homes both need AC at 2 AM.

When your system fails overnight or during a heat wave, GEM responds. Our technicians are available around the clock to restore your comfort whenever emergencies strike.

(833) 222-2953


Call GEM. We’re in Your Neighborhood!

GEM serves all Waltham neighborhoods and surrounding Middlesex County.

Our technicians work throughout the city, from the residential streets near Brandeis to the neighborhoods along Main Street, from properties near the Charles River to the established homes in South Waltham.

Whether you have a Victorian near Moody Street, a colonial in the Banks Square area, or a condo in one of the newer developments, we understand the varied cooling demands across Waltham. Our HVAC team responds quickly because we care for our neighbors like family. Need AC repair services in Waltham? 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 work, school, and commuting, you need service that fits your life.

We accommodate your schedule.

GEM technicians arrive when scheduled, fully equipped for the repairs Waltham homes commonly need.

You know the price before work begins. That’s what you pay when we’re done.

Our NATE-certified technicians diagnose problems correctly and fix them right the first time.

Every repair is tested before we leave. We explain what we did and remain available for questions.

We Repair All Types of AC Issues in Waltham

Victorian homes, mid-century ranches, and modern condos each present unique challenges.

GEM’s air conditioning repair team handles every type of problem Waltham residents encounter.

Waltham’s 19th century homes weren’t built for central air. Our air conditioning repair technicians in Waltham address the challenges of retrofitted cooling in historic construction.

Condos and apartments often rely on mini-splits that need specialized service. GEM’s air conditioning repair specialists in Waltham service all ductless brands.

River valley properties face higher humidity than hilltop locations. Our Waltham team diagnoses dehumidification issues and restores comfort.

Many Waltham homes have systems installed decades ago. GEM’s air conditioning repair technicians in Waltham evaluate whether repair or replacement makes sense.

Older multi-family buildings have complex shared systems. Our air conditioning repair team in Waltham diagnoses issues in these configurations.

Historic and mid-century homes may have panels near capacity. GEM provides expert air conditioning repair in Waltham while working within electrical constraints.

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 Waltham?

A city with this much going on needs service you can count on.

GEM has delivered since 1949.

500 service vehicles. 700+ employees. GEM has the resources to serve Waltham promptly and solve any problem. 

When your system fails, GEM offers same-day air conditioning repair throughout Waltham.

Middlesex County residents rely on GEM because we consistently deliver quality work at fair prices.

The quote we give is the price you pay. No surprises, no additions.

Heating, cooling, plumbing, electrical. One company handles everything.


What Our Customers Are Saying

100% Satisfaction Guarantee

4.6
Based on 9643 reviews
gilbert serra
8 hours ago
Very pleasant and very honest, and they cleaned up after their work and would definitely use them again.
Bob Strouse
8 hours ago
Great service, very clean and professional. Very happy with Gem.
Karen Gray
10 hours ago
Working with Nick to get all my bathroom faucets replaced was a pleasure. Karen Gray
Alyssa Zelman
10 hours ago
Great communication, went the extra mile, professional and friendly. Came out same-day, on-time. Def recommend!
Allan Barbash
12 hours ago
Great service he was very thorough.
Darlene ONeill
12 hours ago
Xavier was confident, efficient, knowledgeable, prompt and treated his trainee with respect.
Dale Abbott
14 hours ago
Great job. They know their “stuff”!
Jim Walsh
17 hours ago
Super fast response time (called at 4:00 on Monday and Mike & Chris were at the house at 11:15 on Tuesday). Mike and Chris were excellent, diagnosed the source of the odor (bad wax ring) and completed the job by 12:15.
Everything from the initial phone call to the quick response from our techs and the repair of our system was an A+! Would recommend to everyone.
GEM was one of only services that got back to me and scheduled me on the same day! Colin was quick, professional, and someone I felt safe having in my home. You get what you pay for!
Corey was outstanding , very helpful, informative and friendly !
Noemi Jordan
1 day ago
Khorey J. and his colleague did an excellent job inspecting our heating and cooling mini-split system. They took the time to explain the issues in detail and gave us peace of mind and at ease by ensuring that everything was working properly. They also explained and demonstrated when the condenser fan should turn on at various temperatures and settings. Both men were knowledgeable, professional, polite, and respectful. We have been customers of Gem Heating and Plumbing for many years, and, as always, they were there when we needed their services. Thank you, Gem Plumbing!
John O'Leary
1 day ago
Efficient and spot on always
Michael Hoff
1 day ago
John did a great job servicing our central heat pump and boiler. He was thorough and a great communicator. Thanks!
Joe Burgess
1 day ago
Great people Very professional Explanation of everything Excellent job
Very personable guys Joe and Landon did a thorough inspection and make sure I completely understood all options for the future
Cindy Mossman
2 days ago
Electrical replacements
Peter Rintels
2 days ago
Have used GEM several times. After some rough experiences with some other HVAC companies, I can say GEM has been consistently outstanding. Highly recommended.
We had an emergency service performed on Saturday, the technician Chris was professional and talked me through everything he was doing. I’d rate his overall work on a scale of 1-10 as over 10 because he was that awesome. What gets me is the pricing of the service. As I mentioned it was an emergency, and as the customer I want an itemized breakdown of parts and labor. I just called GEM and they mentioned they do not provide that. I will continue to call until I get the satisfaction I want on full disclosure of MY billing statement the was paid for in FULL by MYSELF. I know GEM reads these reviews and I want my fully itemized bill for services rendered.
Very satisfied with the service
Bill Cater
2 days ago
The GEM team, Richard (Rickey) and Gabriel along with the electrician were extremely professional. They cleaned up the entire work site with great care to ensure no dirt was left behind. Xavier was outstanding during the service call. happy and highly recommend.
Alyssa Nguyen
2 days ago
Josue & Mike were the two technicians that came and did the work for our home. They were absolutely amazing and did an amazing job! Took their time to make sure everything was done right.
We were not getting heat from our boiler. It was old and not working properly. Richard walked us through a new boiler purchased. Thanks.
Stephen Pratt
2 days ago
Kevin did a great job and explained everything he did to my boiler
Carol Ferrera
2 days ago
Great job! The technicians are kind, courteous, professional and knowledgeable. Thank you!!

What to Expect When You Work With GEM

Professional service should be standard in every interaction.

Same process whether it’s a Victorian near Moody Street or a condo off Route 128.

Our NATE-certified professionals arrive on time, work efficiently, and respect your space.

We tell you what’s wrong and present options without pressure. No jargon, no scare tactics.

Your price is set before work starts. If anything changes, we discuss it first.

As a Carrier Factory Authorized Dealer and Mass Save® partner, GEM maintains quality standards that protect your investment.

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!

From Victorians to condos, Waltham’s homes all benefit from regular maintenance.

GEM’s Home Comfort Club gives Waltham residents annual tune-ups that catch problems before they become failures. Our technicians inspect every component, clean coils, verify refrigerant levels, tighten electrical connections, and document system condition.

For Waltham’s range of building ages and system types, preventive maintenance helps each one perform its best. 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 Waltham, MA With GEM

If your air conditioner is struggling to cool evenly, making unusual noises, or failing when you need it most, GEM is here to help. Our team takes a detail-driven approach to diagnosing problems and delivering targeted repairs that improve comfort, efficiency, and system lifespan.

Whether it’s a quick fix or a more involved air conditioning repair in Waltham, MA, our work is backed by decades of hands-on experience and a commitment to restoring dependable cooling without cutting corners.

GEM technician in front of service truck


FAQ

Do you provide same-day AC repair in Waltham?

Yes. GEM offers same-day air conditioning repair throughout Waltham, from Moody Street to South Waltham to neighborhoods near Brandeis. Our large fleet ensures quick response.

Can you service ductless systems in Waltham condos?

Absolutely. Mini-splits are common in Waltham’s multi-unit buildings. Our technicians service all major ductless brands and can repair or advise on replacement when needed.

What energy rebates are available to Waltham residents?

As a Mass Save® partner, GEM helps Waltham homeowners and condo owners access rebates for energy-efficient equipment. We’ll explain available programs and help you maximize savings.

Why does my Waltham home near the river stay humid?

The Charles River valley creates higher ambient humidity than hilltop locations. If your home feels clammy despite running AC, you may have capacity issues, low refrigerant, or drainage problems. Our technicians diagnose the specific cause.

How often should Waltham residents schedule AC maintenance?

Annual maintenance is recommended for all Waltham properties. Older homes with aging equipment and river-adjacent properties dealing with extra humidity benefit especially from regular tune-ups.

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