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TRUSTED BY WALTHAM, MA HOMEOWNERS

  • Average homeowner rating star icon4.5
    Average homeowner rating
  • Verified reviews icon1.2k+
    Verified heating and air conditioning services reviews

Top-Rated Heating and air conditioning pros in Waltham - Updated Nov 2026

Avatar for Sila Heating, Cooling, Plumbing and Electrical
Sila Heating, Cooling, Plumbing and Electrical
4.5(
5,404
)
Central A/C - InstallGas Furnace / Forced Air Heating System - InstallOil Furnace / Forced Air Heating System - Install+39 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

66 neighbors recently requested a quote
Recommended by89%of homeowners
Avatar for Peter Paone HVAC
Peter Paone HVAC
4.9(
24
)
Ductless Mini-split A/C - Install or ReplaceCentral A/C - Service or RepairCentral Air Cleaner - Repair or Service+9 more

Serving Waltham, MA and surrounding areas

Approved

In business since 2019

Free estimates

Small jobs welcome

"Peter and Mark were very professional. I needed to replace the HVAC dampers and the communication with Peter was excellent and we had all questions answered ahead of time so we didnt have any last minute surprises. They showed up on time and installed the dampers and the HVAC control panel. Very thorough and clean with their work. I've already recommended them to my neighbors."
hvac
Ductwork
air conditioning
Mechanical
hvac

+1

Response time12 hrs
Response rate90%
1 neighbors recently requested a quote
Avatar for Genove Oil & Air Co
Genove Oil & Air Co
4.7(
217
)
Central A/C - InstallGas Furnace / Forced Air Heating System - InstallElectric Furnace / Forced Air Heating System - Install+47 more

Serving Waltham, MA and surrounding areas

Approved

In business since 1977

Free estimates

Emergency services offered

"Excellent. I've had Genove install both gas and oil heating systems in my properties, most recently oil. They have also installed central air/hydro air and handle my oil delivery. The techs have always been polite & knowledgable. Their customer service is impeccable. As a landlord/home owner, I couldn't be happier with them handling all my HVAC needs and would recommend them to anyone."
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+2

Response time12 hrs
Response rate100%
12 neighbors recently requested a quote
Avatar for Airco Home Comfort Services LLC
Airco Home Comfort Services LLC
4.7(
33
)
Gas Furnace / Forced Air Heating System - RepairBoiler or Radiator Heating System - Install or ReplaceBoiler or Radiator Heating System - Install or Replace - For Business+46 more

Serving Waltham, MA and surrounding areas

Approved

In business since 1998

Free estimates

Warranties offered

"He was timely, professional and responsive. He clearly knows the technical aspects of the trade and provided us with a lot of information about the equipment he would be installing and how it would work with our existing ductwork.  We did not care for his sales approach because he tried to sell us on things we did not ask for and did not need.  He tried to sell us on a humidifier for the system which we really don't need because we live right by the ocean where it is quite humid year round, even in the winter. Adding humidity to our house could cause problems with mildew or mold.   He also tried to sell us on replacing our hot water tank for a more efficient model even though ours is only 5 years old.  We got the feeling that he was trying to pack as much sales onto the heat loan program without really thinking about the customer's specific situation, and that put off me and my husband from wanting to work with him.  At the end of his sales presentation he decided on the spot he would give us an unspecified discount.  We did not like this high pressure sales tactic.  We had not received other quotes yet so we declined to decide on the spot.  He emailed us a couple days later offering a 10% discount if we decided by a certain date a couple days later.  We decided to wait beyond that date so we could get more bids.
Joe's quote was $2000 higher than a quote from another installer who has equally good reviews on Angies list.  Both quotes were to install the same equipment, however the second installer included the cost of converting two unused ducts into returns and installing a pass though in a ceiling to help balance our system.  I shared this information with Joe, and he responded by saying he would beat their price by $100.  It goes to show that it pays to shop around. 
As Airco's good reviews on Angies list attest and my interactions with him, I am sure they would do quality work, but my husband and I were totally put off by his sales and pricing approach and did not want to work with the company as a result.

"
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+4

Response time2 days
1 neighbors recently requested a quote
Recommended by96%of homeowners
Avatar for Ace Hardware Home Services
Ace Hardware Home Services
4.5(
53
)
Central A/C - InstallElectric Furnace / Forced Air Heating System - InstallGas Furnace / Forced Air Heating System - Install+47 more

Serving Waltham, MA and surrounding areas

Approved (Corporate)

In business since 1967

Free estimates

Emergency services offered

"The repair went well. Our HVAC system would not turn on so Mike showed up earlier than scheduled (I was called first for the ok) and got right to business. He found the problem- a blow fuse in the unit itself. Once he replaced the fuse the system still would not turn on, but the circuit board that runs the system did light up. he checked out the electrical to make sure there was not a short that caused the problem. It seemed baffling as to the issue so he went outside and checked to see if the electrical issue was at the compressor. Sure enough an animal had chewed thru some of the wiring on the compressor. He spliced the wires together and the system started up, I applaud him for not assuming that the board was faulty and just replacing the board. I would say that Mike did an A+ job troubleshooting to determine what the issue was. The only problem was the cost, and I suppose I should have asked more questions. I asked how much to come out and was told $99 to troubleshoot, but I never asked what other charges apply. Apparently the charge is $99 just to show up and troubleshoot the issue, then $220 per hour is added to that for Mike's time there. I felt $319 was a little steep, but perhaps that is the going rate. I want to emphasize that Mike did an excellent job of solving the issue."
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 Ken's HVAC Service
Ken's HVAC Service
4.8(
44
)
Central A/C - Service or RepairGas Furnace / Forced Air Heating System - RepairThermostat - Install or Replace+1 more

Serving Waltham, MA and surrounding areas

Approved

In business since 2021

Free estimates

Credit card accepted

"Ken's HVAC was immediately responsive to my call and came the next day. When we noticed an additional heating issue I called on Sunday and Ken picked up and scheduled to come out on Monday. He did, and we now have heat. Ken was thorough, professional, and explained everything he was doing. I felt very confident in his work."
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My work
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My work

+12

Response time8 hrs
Response rate93%
Recommended by93%of homeowners
Avatar for Cotti-Johnson Heating-Cooling-Electrical
Cotti-Johnson Heating-Cooling-Electrical
4.7(
168
)
Gas Furnace / Forced Air Heating System - InstallElectric Furnace / Forced Air Heating System - InstallDuctless Mini-split Heating System - Install or Replace+4 more

Serving Waltham, MA and surrounding areas

Approved (Corporate)

Super Service Award Winner

In business since 1948

Free estimates

Emergency services offered

"Excellent. 2 perfectionist electricians, Sam and Steve affiliated with Cotti Johnson HVAC & Electrical, completed the comprehensive work with meticulous attention to details in half a day. They are knowledgeable, kind professionals. If I need any electrical work in the future, they are the first to contact in my list."
Navien Install
Backflow
Outdoor Shower
Well Tank Replacement
Filtration Installation

+62

Response time10 hrs
60 neighbors recently requested a quote
Recommended by88%of homeowners
CJC HVAC
4.9(
26
)
Central A/C - Service or RepairThermostat - Install or ReplaceThermostat - Repair or Reprogram

Serving Waltham, MA and surrounding areas

Approved

In business since 2016

Emergency services offered

Small jobs welcome

"Chris was fantastic! Our usual HVAC company couldn't come out until over 48 hours later, and it was in the 90's out - the house was getting hot! Chris was recommended on a local FB page and he was able to come that day. He was professional and answered all our questions in terms we could understand. We hadn't had out unit cleaned in the 4 years we've lived in our home. Chris offered to come out and give it a good cleaning the following week for a very reasonable price. When he was finished, the unit was quieter and it honestly seems more efficient. Chris will be our new "regular" HVAC person! I will recommend Chris to my friends and family needing HVAC service."
Refrigeration leak repair
Hard Start Kit
Rebuild
Response time2 hrs
Recommended by100%of homeowners
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Heating and Air Conditioning FAQs, answered by experts

If you’re looking for a portable, budget-friendly cooling solution that doesn’t require any venting or installation, a ventless AC system is a good option. Similarly, this is a great choice if you’re renting an apartment or home and aren’t allowed to make large, structural changes like installing comprehensive HVAC, or you’re in a shared space and only need to cool your own room.

Because of the improved efficiency, ACs with higher SEER ratings tend to cool down your home better than models with a lower SEER. Higher-SEER AC units have a higher cooling capacity and a lower energy demand, meaning they may help cool your space faster without running up the electricity bill.

The average cost to replace or install a new HVAC system is around $7,500. However, the price can range from $5,000 to $12,500, depending on factors like the size of your home, the type and brand of the unit, and your specific heating and cooling needs. If you only need to replace certain components, the cost will be lower; for example, a new AC unit can cost between $2,200 and $5,500, while a new furnace costs $3,200 to $6,000. If additional work like new ductwork is required, the total cost could be as high as $22,000. It's best to contact a local HVAC company for an accurate quote.

Florida rooms can have heat or air conditioning, although not all do. These rooms can be added to the existing HVAC system or use a mini-split system, or they may just use a ceiling fan or the breeze from the windows for cooling. Florida rooms with air conditioning often have glass windows to keep the cool inside instead of just mesh screens.

One of the first signs of mold in an air conditioner is a musty smell. You're likely to notice the smell when the unit runs, from the air coming out of the vents or the unit itself. You may also be able to see mold growing on the unit, such as near the condenser coils or by the fan. In some cases, there may be visible mold by the vents.

The Waltham, MA homeowners’ guide to heating and air conditioning services

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