October Is Breast Cancer Awareness Month

Proceeds of New Installations to Benefit The Gloria Gemma Breast Cancer Research Foundation

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 9538 reviews
John Cannon
13 hours ago
Aaron was very helpful to me as i was investigating options so updating my water heater.
Doug Dustin
14 hours ago
I would recommend Nathan and Colin and GEM in the event of a plumbing emergency and or issue. Timely, professional and solved our problem! Thanks
Anthony was amazing very happy with the service that I received. Thank you!!!!
I am still waiting for an email from office about another water heater options.
jkmlbx 52
2 days ago
Joan did an awesome job if I could I would give him 10 stars
tracey baker
2 days ago
Walter and Anthony did a great job and very knowledgeable.
Denise Norden
2 days ago
Replaced our gas clothes dryer, so we needed the old one disconnected and the new one connected which included replacing the dryer vent. The service people from GEM did a great job in a very reasonable amount of time.
Adam Tankanow
2 days ago
John from GEM was a delight: on time, thorough, and open and honest about the work that was being done.
Kevin Lamphier
2 days ago
Smart , personable and honest.
on time,pleasant tech did a good job knowledgeable
tom johnson
2 days ago
David did a terrific job repaired a couple of switches on the water heater repair a leaky pipe and also flushed the system and bleed the air out of it very professional very happy With his work Would use them again
Peter Gauvin
2 days ago
Friendly, honest and upfront about what they are going to do …
James Kakish
2 days ago
Anthony was great.
Aya Kamil
3 days ago
mason was great got the job done quickly and efficiently
Don Gignac
3 days ago
Rainey did an excellent job in assessing our issues with our central air system. He was thorough in his evaluation and then explained the best course of action for us to take in remediating the problem. He also performed an annual check of our hot water heater and our gas furnace. He identify a couple of issues during the review and explained those to me.
Stephen Crowell
3 days ago
Christopher did a very good job. Explained everything very well.
Bob Slott
3 days ago
Douglas was courteous and efficient.
John Walsh
3 days ago
Very professional , great communicator, also neat and tidy. Aaron is very knowledgeable and professional.
Donald Watts
4 days ago
The techs were early and all I did was show them the generator. They did their job with no problems
Janet Secatore
5 days ago
Sorry for the delay in rating the service I got for my HVAC checkup in September. It went as expected and the two service men were efficient, courteous and communicative. Thanks!
Daniel Linger
5 days ago
In a world where you call HVAC companies and either get no answer, an AI receptionist or a human who takes all your information just to tell you they can’t service you until next week, these guys were a breath of fresh air! Same day service. Fair price. Incredibly kind people from the receptionist to the service worker. Thank you guys!
Jodi Livermore
5 days ago
I was so grateful to get such quick, great service, especially on a holiday weekend. Devin was excellent, explaining everything to me and making recommendations. My go to company for all future plumbing needs!
Brendan Murphy
6 days ago
Incredible job on short notice- will definitely use again. Helpful, responsive, and professional which is exactly what you want with a plumber.
Bruce Keeler
6 days ago
Excellent service from Davontay and Anthony. They were quick and explained what they were doing in an easily understandable manner. Great representatives of the company!
Ed Wirtanen
7 days ago
I called GEM for an issue concerning my the cold water intake for my washing machine. Chris responded within a couple of hours and promptly identified the problem and installed the new part. He is very customer focused and thorough. Chris is a very friendly guy with an objective to make the job is done right.

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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