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Top-Rated Air conditioning pros in Waltham - Updated Nov 2026

Avatar for Airco Home Comfort Services LLC
Airco Home Comfort Services LLC
4.7(
33
)
Central A/C - Install - For BusinessCentral A/C - Service or RepairCentral A/C - Service or Repair - For Business+2 more

Serving Waltham, MA and surrounding areas

Approved

In business since 1998

Free estimates

Warranties offered

"Airco is a great family-owned and operated business, very fair and knowledgeable. They replaced our forced air central heating system (oil) in a day, and were quick to respond and get to work despite how busy things were during the January cold-spell. I would highly recommend for your heating and cooling needs!"
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+4

Response time2 days
1 neighbors recently requested a quote
Recommended by96%of homeowners
Avatar for Genove Oil & Air Co
Genove Oil & Air Co
4.7(
217
)
Central A/C - InstallCentral A/C - Install - For BusinessCentral A/C - Service or Repair+3 more

Serving Waltham, MA and surrounding areas

Approved

In business since 1977

Free estimates

Emergency services offered

"The service technician was pleasant, professional, knowledgeable, and very helpful. He got the furnace serviced and in running order with no mess or fuss. I would absolutely hire Genove Oil & Air Co again."
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+2

Response time12 hrs
Response rate100%
12 neighbors recently requested a quote
Avatar for Sila Heating, Cooling, Plumbing and Electrical
Sila Heating, Cooling, Plumbing and Electrical
4.5(
5,404
)
Central A/C - InstallDuctless Mini-split A/C - Install or ReplaceCentral A/C - Install - For Business+3 more

Serving Waltham, MA and surrounding areas

Approved

In business since 1989

Free estimates

Emergency services offered

Live Your Most Comfortable Life with a Company You Trust. \nWe offer Same Day Service and Next Day Installation! \n \nSila has been the center of delighting homeowners since 1989, with our team of engineers, certified technicians, and system designers that are proud to deliver the highest level of expertise in the HVAC industry. Whether it?s a repair, replacement, installation, or service, we have an unwavering commitment to keeping you and your family comfortable and safe ? season after season. \nWe guarantee satisfaction and are proud to have earned over 7,000 ?A? ratings on Angie?s List and its prestigious Super Service Award!

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+6

65 neighbors recently requested a quote
Recommended by89%of homeowners
Avatar for Ace Hardware Home Services
Ace Hardware Home Services
4.5(
53
)
Central A/C - InstallCentral A/C - Install - For BusinessCentral A/C - Service or Repair+3 more

Serving Waltham, MA and surrounding areas

Approved (Corporate)

In business since 1967

Free estimates

Emergency services offered

"We could not have been more pleased. We needed to replace our first floor AC, which is a split-type ductless system, about 17 years old. We had an idea of what the cost would be from an online site: [*** Link removed ***] We got 4 bids, 3 from A rated Angie's List contractors to install a Mitsubishi system (top of the line). Except for one, which was off the charts, the bids weren't that far apart. While Unique was not the lowest bid, we chose them for three reasons: (1) Jason (their rep) was the most savvy about the Mass Save and Mass CEC Air Source rebates, which were quite significant (he handled all the rebate paperwork for us); (2) Unique was able to do the job in a week; and (3) Unique included all the electric work into the total bid (rewiring was required). The installation team (John and Quinn) was excellent. It took them a day and half, They were quiet, neat, professional, highly respectful of our homes and proud of their work. We had worried that they would have to remove wooden ductwork which had been recently painted, but they managed to snake the new hoses through the existing ductwork without disturbing anything. Unique had an electrical contractor on site who replaced the breakers on our electrical panel, installed a higher capacity wire from the panel to the AC system, and replaced the cutoff switch on the outside. We were quite pleased with Unique's work, and would definitely recommend them to others."
Heat Pump
Mitsubishi Hyper Heat
Multiple Ductless Heat Pump Installation
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+6

Response time1 day
Response rate100%
4 neighbors recently requested a quote
Avatar for Druziako HVAC Inc
Druziako HVAC Inc
4.7(
157
)
Central A/C - InstallDuctless Mini-split A/C - Install or Replace

Serving Waltham, MA and surrounding areas

Approved

In business since 1990

Free estimates

Emergency services offered

"I recently bought a house and needed a new furnace and I wanted to add central AC to my house. I have a friend who has been a contractor for 20 plus years in the town I moved to. I asked him who he uses, he said he only uses Druziako. I called them up and they came out gave me all my options and advised me on the best way to add duct work etc. They gave me a date they would be there and said it would take 2 days to complete the install. They showed up on time. They finished it in 2 days. Guys were professional and clean. The whole project came out better than I expected. I couldn't be more happy. I would recommend them to anyone. I would also recommend central AC to anyone. It's a nice gift to give yourself :)"
Aprilaire Dehumidifier
Attic Air Handler
Duct Cleaning before and After
Attic Ductwork
Aprilaire Humidifier

+3

Response time11 hrs
17 neighbors recently requested a quote
Recommended by95%of homeowners
Avatar for Atlantic Heating & Air Conditioning
Atlantic Heating & Air Conditioning
4.1(
153
)
Central A/C - InstallCentral A/C - Install - For BusinessCentral A/C - Service or Repair+3 more

Serving Waltham, MA and surrounding areas

Approved

In business since 1962

Free estimates

Emergency services offered

"We've used Atlantic Heating & AC for many years and wouldn't consider any other company. Atlantic is extremely responsive, priced reasonably, and they always do a great job. We've never once had to call them back to resolve any issues associated with their work, and they've done a lot of work over for us over the last 9 years. Recently, our water heater died very suddenly; I came home from my office and water was leaking out of the water heater onto the basement floor. Within minutes, their service manager was guiding me over the phone regarding which valves to turn off etc. and he had me take a few pics to send to him. The very next day, a serviceman was at our house installing a brand new, much better water heater than the house had come with, and we haven't had an issue yet, and this was several months ago. I'm a Realtor and Atlantic has bailed my seller clients out of HVAC issues on a moment's notice, so I will always be grateful for the excellent sales and service that we receive thanks to Atlantic Heating and AC."
Response time3 days
Response rate100%
5 neighbors recently requested a quote
Avatar for Peter Paone HVAC
Peter Paone HVAC
4.9(
24
)
Central A/C - Service or RepairDuctless Mini-split A/C - Install or Replace

Serving Waltham, MA and surrounding areas

Approved

In business since 2019

Free estimates

Small jobs welcome

"I had a cleaning of HVAC system and also got one additional vent installed. They showed up on time and finished the work timely. They also listened to my questions and answered all of them to my satisfaction."
hvac
Ductwork
air conditioning
Mechanical
hvac

+1

Response time12 hrs
Response rate90%
2 neighbors recently requested a quote
Avatar for Everclean Air LLC
Everclean Air LLC
4.8(
43
)
Air Ducts & Vents - Clean

Serving Waltham, MA and surrounding areas

Approved

Super Service Award Winner

In business since 2023

Free estimates

Emergency services offered

"This was one of the best service experiences I've had. Gabriel was excellent. He was polite, respectful of my home, explained the service thoroughly and answered all my questions. A pleasurable experience from start to finish. Highly recommend. Will be sure to tell friends and family about this service for their air system needs. Thank you!"
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+2

Response time7 hrs
Response rate100%
7 neighbors recently requested a quote
Avatar for Duct Kings
Duct Kings
4.7(
410
)
Air Ducts & Vents - Clean

Serving Waltham, MA and surrounding areas

Approved

Super Service Award Winner

In business since 1999

Free estimates

Emergency services offered

"Perfect! The technician arrived on time. He was very efficient, courteous and professional. I showed him where the dryer and outside vent were and went back to work in my home office. Shortly later he told me it was finished. He had done the following: - Showed me pictures and videos of the work that he had performed - Of particular interest was the 'before-and-after" picture of the inside of the dryer duct, which had been clogged with lint - He cleaned out the dryer inside-filter - He swept and vacuumed the area between the dryer and the wall - He put a screw in the dryer vent hose that had been missing - He installed the outside bird-guard that had fallen on the deck months ago I would like to use Duct Kings again to clean out my home AC ducting."
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Response time2 days
Response rate100%
16 neighbors recently requested a quote
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Air Conditioning FAQs, answered by experts

Capacitors are the most frequent part of an HVAC system to experience failure. These components are crucial for starting the motors that power the fans and compressor, but over time, they may become worn or fail due to electrical surges or regular wear and tear. When capacitors malfunction, HVAC systems may experience decreased heating or cooling efficiency, or even total system failure. Replacement or maintenance of capacitors is a common requirement for the optimal functioning of HVAC systems.

If refrigerant levels are low, it can cause the evaporator coil to freeze up. Low freon causes a drop in pressure, which will make the coil too cold and cause moisture to freeze on the coil. Your system may be low on refrigerant because of a leak. 

Make sure to have maintenance performed twice a year, and contact your local HVAC technician if you suspect your system has low freon levels.

HVAC companies may charge an hourly rate or a flat fee. Hourly rates typically range from $100 to $250 per hour, with an average around $175. Some contractors charge a flat fee for specific services, such as an inspection, which can cost between $150 and $500. The total cost of an HVAC service is influenced by several factors, including: the urgency of the service (emergency repairs after hours or on holidays cost more), the time of year, the type, size, and brand of your HVAC system, the specific repair needed, and whether you have a service contract.

Air conditioners can stop working in the middle of the night for many reasons. Your local power grid might shut down late at night. Power surges can also trip your breakers if too much power is being used in the area at the time. If your AC is connected to a digital thermostat, it gets naturally cooler at night, so the outdoor temperature might dip below the automated setting to turn the cooling system off.

You should only run your dehumidifier in warmer months, such as spring and summer, to get the best performance out of your system. The air gets drier when temperatures drop in the winter months, creating less of a need for a dehumidifier. However, when to run a dehumidifier will depend on your local climate.

The Waltham, MA homeowners’ guide to air conditioning services

From average costs to expert advice, get all the answers you need to get your job done.