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 8895 reviews
GEM plumbing recently installed a ductless minisplit system in my home. The installers did an excellent job. They were extremely knowledgeable, courteous, and patient. They communicated with me every step of the way and took the time to answer all of my questions. The system is working beautifully. If you are looking for a contractor to install a ductless minisplit system, I highly recommend GEM plumbing.
I do wish it hadn’t been so expensive, but I will say I really did feel like my technician understood what he was doing. He was knowledgeable and professional. He explained things well and I’d be happy to work with him again.
William (Bill) and Antony arrived promptly and serviced my boiler system – everything is up and running smoothly (and the hot water is back).!
Dory was friendly, respectful, and went above and beyond!
Omar did an excellent job installing our central air conditioning system. Very efficient and friendly. He got the system up and running quickly and had a great attitude. Kept the house neat while cutting holes in the ceiling for vents. An all around positive experience.
Steve R was amazing and was super helpful and kind 10/10 would welcome back!!
Eliceo from Gem is a professional skilled technician. He explained the installation process and was organized and neat.
Very efficient and focused. They were in and out in no time.
Great job. Very helpful explaining what the problem and what to expect from the repair. Highly recommend Gem.
Walter and Anthony did a great job!
1st time using GEM for plumbing. Process was smooth, the workers were professional and diligent and kept me up to date the entire process. I highly recommend their services
Right on time, very knowledgeable about the issues I had. Great job fixing the leaks I had at home. No doubt I would recommend their service. Thank you Abraham.
Nice people, quick to respond and knowledgeable. Highly recommend them for emergencies. William T. was great, thank so much
First maintenance on our Generac. All went very smoothly!! Arrived within timeframe provided and even informed on actual arrival that day!
Very polite gentleman who went right to work, provided an update once maintenance was completed and explained basic process performed.
David S, our GEM technician was on time, respectful of our home and provided us with a thorough explanation of our GEM service contract and the scope of work completed and recommended. I would highly recommend him again!
Alec and Scott made quick work of what turned out to be a simple solution. Very efficient, pleasant and explained the issue and recommendation clearly.
Both service calls to my house were with Nick, and I can't say enough good things about him. He's professional, courteous, communicative, and thorough. My only hiccup with Gem has been conflicting information from the office, but even with hiccups the staff have been professional and friendly. Thank you, Gem! You're the best, Nick!
great guy! vaery talented and professional
Joseph (Junior) from GEM Plumbing & Heating came out to do a check on our HVAC system for this season. He was very thorough, knowledgeable, and honest. Our system is in great shape after 16 years. Thank you Joe!!! We were on a contract plan, which was very reasonable, so we paid nothing at the time of service.
Our tech was Joseph (junior), Incredible experience came out the same day.Billed me for the service. Exceptional diagnostics, developed a number of options to fix the problem. We called four other places.First three never showed one showed and walked away, without figuring anything out. Our A/C has been out for 6 wks waiting for people to not show up. YOU ABSOLUTELY MUST CALL GEM FIRST
GEM responded very quickly. I was out of state when my tenant called stating the A/c system wasn't working. I called GEM to see if they would be willing to help me. I didn't have an account with them but they were more than willing to assist me with my broken A/C system.
Nick the technician was very knowledgeable and worked with me while I was out of state and with my tenants. He articulated very well, explaining all the issues, what the repair process would involve and the cost. There were no surprises. My tenants informed me that Nick was terrific !
Nick got the system up and running. Overall, it was a very positive experience and I would highly recommend GEM to anyone.
Great service. Timely response and got the job done. It’s on the pricey side but that’s expected given their quick response time. Joe was particularly good and have had him out twice on our property. Thanks!
From beginning to end the experience was amazing. It started with my man Walter who calmly with humor explained the process and my guys Ben and his partner who took cared of me and my family. They were professional and very knowledgeable about the process. Their patience when not finding my well was welcome. Awesome job
Thank you
The people are nice, punctual, pleasant.
And best of all great prices. I'm very happy with the service.
I was very impressed with Dory . He was extremely knowledgeable and very helpful.

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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