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 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

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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