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 9076 reviews
Excellent service in every respect: starting with the salesperson, Peter Dallas; Sean, the installation coordinator; and, of course, the installers Joe & Cristar!!
Pete was extremely professional, friendly, understanding and very flexible when negotiating the final price.
After 28 years of using a Lennox central heating and air conditioning system, we decided was time to get new systems and we went with Carrier this time, a highly respected brand too backed by GEM Plumbing as a certified provider. Both the sales process and the speed of the installation were incredibly efficient. We spoke with Peter on a Tuesday morning , and by 3:00 p.m. on Friday of same week the installation was complete. We were lucky enough to have Joe Medeiros and Cristar Fig from GEM as our technicians!
Let me tell you, this duo is exceptional! They are very young but possess extensive knowledge and a fantastic attitude. I was truly impressed by their technical work and their courtesy. These two technicians are a great asset to GEM and WE would love them to be recognized! We are very happy at home; the air conditioning system works wonderfully! And We can’t wait to use this coming winter our new furnace too!
Thanks to Peter, Sean, Joe, and Cristar for their amazing job!!
Sincerely
Mary
ALecs Reyes was the best!!! Extremely knowledgeable and professional. He turned our terrible experience with our last contractor into a positive outcome . I will add that he was a fantastic mentor to the helper he brought along today. ALecs is the kind of employee every business owner searches for….Good luck in your career at Gem Alec’s!!!
Great service and very personable rep. I am very happy that I contacted GEM.
Nicole was great. Super nice, super helpful and quick. I wish I was as effusive about the exorbitant prices that GEM charges.
Super great people and service!
We had been struggling to find a plumber for a month! GEM was available and took us in immediately when others were ignoring our calls! We now have hot water again. I can shower in peace.
Richard was on schedule and very honest and transparent regarding the failed part and freely answered questions about the HVAC system overall.
Update!
July 2026 — I just had Tim F from GEM ground my 21' above ground pool. Service was quick & excellent as usual! Highly recommend GEM electricians, plumbing & HVAC! They're fantastic!

—–
June 2026 — Just had John P from GEM provide maintenance on my central AC unit. He was fantastic! Explained everything and performed his work efficiently with great communication andcrespect for my home! He was just great! I appreciate being able to get an appt so quickly with GEM. It's so helpful to be able to schedule appointments around my availability and as a FT worker who commutes via rail, I value that scheduling flexibility. Their work is exceptional. I highly recommend GEM!

The GEM plumbers were fantastic. They hooked up a new spigot and a back flow preventer for the drip irrigation system I will have installed soon. They explained everything, they were fast and respected my home during the job. I highly recommend GEM for your next plumbing repair or upgrade.
Today Nicole from GEM extended the pipe and added a female adapter for the irrigation system. She was speedy and fantastic!
Timely, helpful, and knowledgable! Took time to explain things thoroughly
Bob was on time, did a good job and was very helpful.
Problem was taken care of, and further service was recommended for our consideration. Nick was friendly and explained things really well. Overall would highly recommend thank you.
Hands down the best service, communication is top notch. My Ac and furnace needed to be replaced and I must say Alecs Reyes and team were amazing, polite and professional and informative every step of the way. I highly recommend Gem.
The men we're totally professional and friendly they did a great job cleaned up after themselves and everything looks great!!
fantastic technician and service!
Very knowledgeable, hard-working and personable and would have Highly recommend GEM for work in heating cooling
Great having GEM here for Installation of heating system – From start to finish : very professional, got the job done in a helpful and timely and efficient way: helping me feel ready this year For the heating season, Thank you Gem!
Gem responded within 4-5 hours when we had no ac. Great job by Joseph & Nem! They explained exactly what they were going to do. They were courteous & polite answering all our concerns & questions. Very professional!!!
Lydia & Charlie Wilson
Great service !
The technician did a great job!
Very satisfied with the work .
The technician was pleasant and respectful of my home.
David S. is a knowledgeable, courteous and effective HVAC technician. He was quick to diagnose the problem, provide a stopgap repair and return early the next morning to replace the faulty equipment. I highly recommend him.
John called ahead and let us know when he would arrive, and he was on time! While he offered more services than we wanted, he was happy to do just what we asked for. He did a great job and the pricing was standard. We definitely recommend GEM.
Knowledgeable, professional, courteous, and very hard-working
I needed the outside spigots replaced. They were able to accommodate my schedule. Everyone I spoke with at GEM was very kind and knowledgeable.
Shout out to Joseph Houston who was the one to do the work at my house. He was very nice and explained things to me.
Overall I am very happy with GEM
Roberto provided an excellent review and proposal for a new mini split system. He was very thorough and answered all our questions. We agreed to the terms the next day then the installation was performed the following day! The installation team was top notch! They handled all the installation from the electrical, air handler and the heat pump. We couldn't be happier and highly recommend GEM pluming and heating!
Ryan Sandbach was knowledgeable, professional and very personable! They were here for a free estimate and in the end there was nothing I needed immediately. Ryan was very happy to continue to discuss all of my thoughts and concerns in my old home. He never did a hard sell and I look forward to calling GEM/ Ryan in the future.

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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