New High-Efficiency Hot Water System + One Year of Free Home Comfort Club

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 9701 reviews
Bob Wittman
10 hours ago
Erickson was extremely knowledgeable, personable and professional.He was a pleasure to work with and did an outstanding job.
Dave Doyle
12 hours ago
I recently had a mini splint installed by Evan, Nick and Kerron at GEM. Fantastic experience and service–those guys did great. I also had a Generac put in a few years ago, and am pleased with the overall level of service I get from GEM. Hard to go wrong!
Deb Smith
13 hours ago
Checked my humidifier on the furnace and fixed it. Joe H fixed it, he’s great, as always.
David Casper
13 hours ago
Technicians were wonderful. Very knowledgeable and provided multiple options to address a complex problem. Thank you!!!
Paul Hoyt
14 hours ago
serviced our split system in a competent and efficient manner
Joe Lucia
14 hours ago
Tom and Ethan were professional, knowledgeable, and efficient in unclogging the impeller of our outdoor sump pump and cleaning all the leaves and debris out of the underground basins that feed the pump! Highly recommend!
Bill Scarsciotti
15 hours ago
The technicians were very friendly, courteous and through with the work and explained exactly what was done. Went the extra mile to make sure Everyting was just right and left the place clean.
Stasia Mowry
17 hours ago
A very polite and knowledgeable service technician and good service was given.
Julia Frugoli
17 hours ago
This is fourth time we've used this service. They are quick, professional and knowledgable. Very responsive and worth the money!
Anne Geary
17 hours ago
John came to my home to do yearly heating maintenance. He was very informative and thoughtful. I would recommend him he is very knowledgeable and professional.
Kyla Piquette
17 hours ago
Eric is very professional and helpful. If you contact GEM ask for Eric for your appointment.
jarrod Roach
20 hours ago
Living on the Cape finding a reliable service company can be difficult. GEM is now my go to for HVAC and plumbing service.
Elizabeth Meredith
21 hours ago
Gem is a good company with pleasant people who are always willing to help. We were recently visited by Christopher and Nicholas. Thank you for your help and advice.
Very professional and helpful really appreciate the work you guys did . Top notch
On time, courteous, efficient and explained what they did.
Roland Jarest
2 days ago
Brian and Mason were fantastic and did a great job!
⭐⭐⭐⭐⭐ I had an excellent experience with GEM Plumbing & Heating! Corey was absolutely wonderful. He was professional, knowledgeable, courteous, and very attentive. He took the time to make sure everything was done properly and provided outstanding customer service. It’s refreshing to have someone who genuinely cares about the quality of their work and their customers. I highly recommend Corey and GEM Plumbing & Heating. Thank you, Corey, for such a great experience!
Donald Dos Vais
2 days ago
If l owned a business l’d hire Tom in a New York minute!! I would definitely not score a 10, but an eleven!!!!!!
Sara
2 days ago
Devin was very knowledgeable, professional and incredibly helpful
Eileen Yee
2 days ago
GEM Service Technicians are always pleasant & efficient. GEM scheduling is difficult- , they always cancel & reschedule.
FX Flaherty
2 days ago
David S. was amazing…he not only greatly assisted us with addressing our issues but he did in such a polite and educational manner…I cannot highly recommend enough..he was great!
Jeannine Kolb
2 days ago
Christopher Brouwer is a great technician. He is knowledgeable, professional and personable. I would recommend him to anyone and would welcome him for any future work on my AC system.
Installed my air conditioner. Excellent service!!!
Barry Wepman
2 days ago
Brody and Clarissa were really great. Obviously they knew what they were doing and made reasonable recommendations about ongoing service. Most importantly we’ve got heat! And GEM has a new customer!
Robert DelBove
2 days ago
Kevin arrived on time and I was notified that he was on his way. Good communication on the dispatcher’s part. I showed him the utility room and trusted he would do the work so I got out of his way. He was efficient and got the service completed in no time.

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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