Expert AC Installation Services in Waltham

Your home should feel comfortable no matter how hot it gets outside.

From the South Side to Pigeon Hill and neighborhoods throughout Waltham, reliable air conditioning makes your home livable when Middlesex County temperatures climb.

When your system can’t maintain the comfort you expect, it’s time for an upgrade. At GEM Plumbing & Heating Services, LLC, we solve cooling problems. Our licensed HVAC team assesses your needs, recommends the right system, and handles every installation with precision.

You get dependable performance backed by 75+ years of service to Middlesex County families. Call us today about air conditioning installation in Waltham.

(833) 222-2953

GEM Technicial Inside Van


(833) 222-2953

We’re Right in the Neighborhood!

GEM knows Waltham and the surrounding Metro West area.

From homes near Brandeis University to properties in Cedarwood, the Highlands, and throughout Waltham, we’ve been serving this Middlesex County community for generations. We understand Metro West summers and what it takes to keep homes comfortable when Massachusetts heat arrives. When you choose GEM for air conditioning installation in Waltham, you’re working with a team that’s served the area since 1949.


Skilled employees

Trucks on the Road

Years in Business

Emergency Service


Stress-Free AC Installation Process

GEM manages everything from consultation to completion, making your air conditioning installation in Waltham simple and efficient. Our streamlined process removes the uncertainty from upgrading your cooling system.

A licensed technician assesses your Waltham home’s cooling needs and provides transparent pricing with zero surprise charges or hidden fees.

We help you choose the ideal air conditioning system based on your home’s size, layout, efficiency goals, and budget.

Our certified team installs your new AC with precision, ensuring optimal performance and efficiency from day one.

Before we leave, we thoroughly test your system to verify proper operation and explain basic maintenance.

Female Gem Plumbing u0026 Heating employee sitting at a desk smiling

(833) 222-2953


What Our Customers Are Saying

100% Satisfaction Guarantee

4.6
Based on 8519 reviews
Jonathan was very neat and helpful with my emergency plumbing needs
GEM workers well qualified, friendly and extremely helpful. Installed two new units in one day – efficient and excellent work.
Honest and fair. Work was clean and well communicated. Response to issue was 24 hours. The three techs…Anthony, Brody, and Nick, were polite quiet clean work and communicated step by step… job well done.
Paul V from Carmine’s, arrived promptly and was very professional, knowledgeable, patient and has a great demeanor. He changed the control board of my HAVAC unit, and gave me great suggestions of the usage of it. Paul is very sincere and you can see his dedication to his work. I would definitely recommend Carmines and Paul V for any of your HAVAC needs.
Friendly, explained what was being done and what to watch out for.
Great job by David
Victor is the best. He fixed our clogged pipes and came out right away
Great service ! They were on time, respectful and took care of business quickly and efficiently
Lost our well water tank, great job with replacement. While here had them replace kitchen faucet and garbage disposal also. Will use GEM from now on!
Eric and Steve are great. Got the job done fast. Cleaned up. Terrific work.
We had 2 very old direct vent gas wall heaters replaced. Evan and Steve are the best. They explained everything and did a awesome job for never putting in these Rianni heaters . Kept me informed and answered all my questions and eased my concerns . Couldn't of asked for two better guys. The electrician and his assistant were outstanding with the fact the house was
built in 1925 with older wiring . Chen and his assistant installed 2 dedicated circuit for both heaters to run on and it works out great as now my air conditioner will run on the dedicated circuit this summer. Would recommend all of them for future heating needs .
We had the bathroom one downsized to a smaller unit with no issue what so ever even with them having to remove the bigger one they had put in they were happy to accommodate the issue
They are sweet, knowledgeable and quick. Thank you guys for an excellent job done, I appreciate it.
The gem guys could not have been any nicer. We had to leave and trusted them in our home alone.
Very professional and thorough. Serviced not only my mini-split but my air conditioner and checked my furnace and changed it's filter. Very happy.
The folks at Carmine's/GEM always do a great job👍 Anthony Pena did a great job checking the gas dryer connection and valve. Made sure everything was working properly and that there were no leaks.
Joan Martinez came to my house on an emergency call when my furnace/boiler broke down at 1 am. He diagnosed the issues and unfortunately I needed a new system. GEM installed the new system over the next two days. Everyone on the crew was excellent. I signed up for GEM’s maintenance program because if I had previously it would have prolonged the life of my furnace/boiler. Today Joan Martinez returned to do routine maintenance on my mini splits. He was very thorough and made sure the units are ready for the summer season. I highly recommend and trust Joan Martinez for any job.
Brody you were terrific! So knowledgeable. Appreciate that he showed what might be needed in the future. Thanks Gem Plumbing for sending him. Thanks for coming out Steve and servicing air conditioning and cleaning splits replacing filters as well as making sure it all works. I appreciate the prompt and friendly service. Sincerely I've
Anthony did a great job. He was very professional, friendly, and explained to us what he found and what was needed. Excellent service! Thank you!
Services were very good. Technician was very polite, respectful and knowledgeable. I was very pleased.
Thoughtful and shared every step.
David was friendly and knowledgeable.
Very good experience. Quality work, and professional.
David was very thorough and patient. He was determined to get us a resolution and even ensured he taught us on best practices and troubleshooting techniques.
Although, we had to drop a lot of money today. We are very appreciative of David Santiago and Colin D. David explained everything that was wrong with our system. Even tried to find a way to fix the disaster. Even though we both knew, it wasn't worth it. That's where Colin come in and broke the heart breaking news but helped us find options and worked with us. With that we are VERY thankful for you both! GEM has a life long customer. Thanks guys.
Alex did a great job and most importantly, gained the confidence of my wife. Not an insignificant accomplishment in the middle of major repairs that required shutting off water and not flushing toilets, etc. Thanks Alex!

GEM technician portrait in front of GEM service truck

(833) 222-2953

Warning Signs It’s Time for AC Replacement in Waltham

Your air conditioner provides clear signals when replacement makes more sense than another repair.

These warning signs tell you it’s time to consider new air conditioning installation in Waltham.

Air conditioners typically perform reliably for 12 to 18 years before natural efficiency decline begins. Equipment exceeding this age develops problems more frequently and costs more to operate. When your system passes 15 years, replacement usually delivers better long-term value. Modern systems incorporate technology that achieves superior cooling with reduced energy consumption, improving both comfort and monthly costs for Waltham homes.

Your air conditioner shouldn’t operate continuously just to maintain barely adequate temperatures. When your system runs all day but rooms stay warm, it’s telling you it can no longer meet your cooling demands. This constant operation wastes energy while failing to deliver proper comfort. Professional air conditioning installation in Waltham provides properly sized equipment that maintains consistent temperatures throughout your home without excessive runtime.

Grinding, squealing, or banging sounds signal serious mechanical deterioration developing inside your equipment. These noises indicate components breaking down or mounting stress that escalates with continued use. What begins as occasional noise typically accelerates toward complete breakdown. Replacement solves these issues permanently while giving you quiet, reliable cooling backed by modern technology and warranty protection.

When you’re scheduling AC repairs season after season, you’re maintaining failing equipment. Repair costs accumulate without solving fundamental problems. Aging systems develop cascading issues where each fix only postpones the next breakdown. Air conditioning installation in Waltham ends this expensive pattern and delivers the reliable cooling your Middlesex County home deserves.

We Install All Types of Air Conditioners in Waltham

Every Waltham home has unique cooling requirements, and GEM offers energy-efficient systems to match your needs.

Whatever solution works best for your property, you’ll get expert recommendations, professional installation in Waltham, and lasting reliability from Massachusetts’ most trusted HVAC team.

For comprehensive whole-home cooling, central air systems maintain even temperatures in every room. GEM installs high-efficiency central air conditioning in Waltham that integrates with your existing ductwork, providing quiet operation, lower energy costs, and consistent performance. These systems are ideal for Waltham’s single-family homes and deliver reliable comfort throughout your entire living space.

Heat pumps provide both cooling and heating in one efficient system, reducing energy bills year-round. Modern heat pumps operate effectively even during New England winters, making them an excellent choice for Waltham homeowners. As a Mass Save® Heat Pump Installer, GEM helps you access rebates and incentives when you upgrade to heat pump installation in Waltham, making this efficient technology more affordable.

Ductless mini-splits cool specific rooms without requiring ductwork installation. These systems offer flexible zoning control, whisper-quiet operation, and exceptional efficiency. They’re perfect for Waltham homes with additions, finished spaces, or rooms where installing traditional ductwork isn’t practical.

GEM: Proud to be Waltham’s Trusted AC Installation Company Since 1949

When Middlesex County heat and humidity arrive in Waltham, your home should provide the cool sanctuary you need.

We’re proud to help families from Moody Street to neighborhoods throughout this Metro West community with all of their air conditioning installation needs.

We’ve served Waltham and surrounding Metro West communities for generations, treating every customer with care and respect. GEM brings proven expertise and modern technology to every AC installation, delivering systems built for lasting performance.

With one of the largest service fleets in New England, we’re always nearby when you need us. GEM provides same-day service and efficient air conditioning installation in Waltham to keep your home comfortable without extended delays.

Our NATE-certified professionals bring the highest level of training and care to every job. We treat your property with respect, prioritize your safety and comfort, and ensure every installation meets exacting standards for performance and reliability.

As a Mass Save® Heat Pump Installer, Carrier Factory Authorized Dealer, and National Grid Value Plus Installer, GEM helps you access valuable rebates and incentives when installing energy-efficient cooling systems. We simplify the savings process while upgrading your comfort.

Our Home Comfort Club maintains your AC in peak condition through regular inspections, tune-ups, and exclusive member benefits. It’s the simplest way to protect your investment and ensure reliable comfort throughout every season.

Smart thermostat installation by GEM HVAC technician

(833) 222-2953


customer and technician interaction

Our GEM Family Cares for Your System’s Entire Life

Your air conditioner works hard every summer. Regular maintenance keeps it running efficiently, quietly, and reliably for years to come.

Our Home Comfort Club makes maintenance easy with annual tune-ups, priority scheduling, and discounts on repairs. We catch problems before they become emergencies and keep your system running the way it should, year after year.


Contact GEM for New Air Conditioner Installation Services in Waltham

Don’t wait for your system to fail completely.

GEM’s licensed HVAC team stands ready to install the ideal air conditioning system for your Waltham home and the surrounding Metro West area. With same-day availability, flexible financing, and 75+ years of trusted local service, we make it easy to reduce energy costs and enjoy lasting comfort all summer long. Call or contact us online now to schedule your consultation!

GEM technician in front of service truck


Other HVAC Services You May Need


Air Conditioner Installation FAQs

What brands of air conditioners does GEM install?

As a Carrier Factory Authorized Dealer, GEM installs top-quality Carrier systems known for durability and performance. We also service and replace most major brands, ensuring you get the best fit for your home and budget.

Can GEM install air conditioning in Waltham homes near Brandeis or Bentley?

Absolutely. Properties throughout Waltham, including neighborhoods near both universities, often have varied layouts and requirements, making professional assessment essential for air conditioning installation in Waltham. GEM specializes in finding the right solution for your specific property.

How soon can I schedule my AC installation in Waltham?

With our 500-truck fleet and local Massachusetts team, GEM often provides same-day or next-day installation. Call our customer care team or book online to schedule your free estimate and get comfortable fast.

What size air conditioner does my Waltham home need?

The right AC size depends on your home’s square footage, layout, insulation, and sun exposure. Properties include everything from historic homes to modern residences, meaning each home has different requirements for air conditioning installation in Waltham. GEM’s licensed HVAC technicians perform a detailed load calculation to ensure your system is perfectly sized for maximum comfort and efficiency.

Are rebates available for AC systems in Waltham?

Yes! GEM participates in programs through National Grid and Mass Save® to help you access rebates and special financing for high-efficiency air conditioners and heat pumps. Our team helps you apply and maximize your savings.

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