October Is Breast Cancer Awareness Month

Proceeds of New Installations to Benefit The Gloria Gemma Breast Cancer Research Foundation

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 9523 reviews
Brendan Murphy
13 hours ago
Incredible job on short notice- will definitely use again. Helpful, responsive, and professional which is exactly what you want with a plumber.
Bruce Keeler
1 day ago
Excellent service from Davontay and Anthony. They were quick and explained what they were doing in an easily understandable manner. Great representatives of the company!
John Walsh
1 day ago
Very professional , great communicator, also neat and tidy
Ed Wirtanen
1 day ago
I called GEM for an issue concerning my the cold water intake for my washing machine. Chris responded within a couple of hours and promptly identified the problem and installed the new part. He is very customer focused and thorough. Chris is a very friendly guy with an objective to make the job is done right.
Susan McCaffrey
2 days ago
Excellent professional service!
Barbara Amiro
3 days ago
I was very pleased with Aaron N. professionalism in servicing our water heater. This service is included in my service plan.
On time. Pleasant. Introduced themselves. Went over the work completed. Left the area clean.
Steven sogoloff
4 days ago
We did a maintenance request for our heating system. Christian and Joie were very pleasant and gave us the results based on their analysis of the system. They arrived within the time frame and completed the process in about 30 minutes.
Joanne Iachetta
4 days ago
Showed up when expected. So kind and courteous and explained everything to me that would need to be done for my plumbing issue. Would highly recommend GEM.
Vin Milano
4 days ago
Erickson was great! Explained conditions of units and recommendations for upkeep!
Doug Williams
4 days ago
The service was good.Aiden was very good. It’s just they said they were on there way 2hrs and30 min they finally arrived. Waited all afternoon
The 2 service men were on time, assessed the problem, diagnosed the issue, came up with a plan and offered several solutions for fixing our mini split. They took pictures, tried clearing out mice debris , attempted to get the outside machine to work ( apex 2 hours) Alas a no go, so we decided to scrap it and go with baseboard heater for the room over the garage. Up front information and pricing , no nonsense. Affable techs and so far great service.
Doug Dustin
5 days ago
I would recommend Nathan and GEM in the event of a plumbing emergency and or issue
David Polishook
5 days ago
No repair was performed at this time I had to pay a diagnostic fee.
Eaven though I was very specific what toilet I wanted they put the wrong one in.
Kristen Mouris
5 days ago
Absolutely incredible and fast service from Nicole T! Our upstairs toilet began leaking Saturday night and by noon on Monday we had a new toilet! Nicole was super informative and walked us through our different options every step of the way. She made an otherwise stressful situation so much easier!
Robert Mason
5 days ago
I had a great experience with Gem Plumbing and Heating. It was great starting from the initial phone conversation and continued with Brian Ciaschini. Brian was an excellent electrician, he was cordial, informative and helpful. Brian made sure everything was working perfectly! I would recommend them and I will use them again.
Friendly, efficient working time, knowledgable!
keith farnham
6 days ago
Excellent as always
Alex Fagundes
7 days ago
Exceptional service! Knowledgeable, and they left with giving me a lot of insight on boilers and options we had. They left and we felt much better.
Joanne Bennett
1 week ago
Exceptional service from GEM. Douglass is absolutely the best !!! … will use them again. Thank You!
buddy croce
1 week ago
Workers were polite and knowledgeable. They diagnosed the problem right away. And we're able to repair it same day.
Steven Pichette
1 week ago
August 27 2025 . Another excellent yearly electrical plumbing , & heating checkup by Eric Governo , Brody Lott , Aiden Cunningham and crew. Thanks! Aug 2025 – Excellent service by Jacob and his coworker . Yearly maintenance on our Generator . Great service as always . Routine maintenance appointment for our boiler . Highly recommended . 2025- same great service for our routine maintenance for our central air unit. May 14, 2026 – great yearly central air maintence by Joe and Anthony . Professional and helpful explaining the inspection they preformed August -18 2026 – we had our yearly maintence for our generator . Aiden was the Gem tech that came out and did the yearly maintence. Aiden was excellent answering all my questions regarding the generator . Was a pleasure having Aiden serviced our yearly generator maintenance August 21-2026. Gem tech Richard stopped by today to go over a couple of issues with our central air unit . Excellent visit and service . August 28 2026 – another great professional visit today by ( Senior ) Joseph . Our central air went down and was fixed in less than 24 hours . Thanks again ! Oct 1 2026 – Erikson M and Demetris arrived to inspect my furnace for its yearly tune up . Another excellent professtional visit. Thank You !
Kate Kelley
1 week ago
I had a plumbing emergency today & GEM had a guy on my doorstep within 1/2 hour. I couldn’t even get a return phone call from anyone else. Excellent service!
Robert Smith
1 week ago
Christopher was efficient and courteous and completed my boiler and split unit heat annual maintenance quickly. Highly recommended!

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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