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

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+12 more

Serving Cohasset, 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!

Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+6

67 neighbors recently requested a quote
Recommended by89%of homeowners
Avatar for Venture Mechanical
Venture Mechanical
5.0(
18
)
Central A/C - InstallCentral Humidifier - Install or ReplaceDuctless Mini-split A/C - Install or Replace

Serving Cohasset, MA and surrounding areas

Approved

Super Service Award Winner

In business since 2022

Free estimates

Emergency services offered

"Dylan is very reliable and knowledgeable. He has provided plumbing services many times for us and I wouldn't use anyone but him. The service is exceptional and pricing is extremely fair. I highly recommend Venture Mechanical for any plumbing, heating, or air conditioning needs that you may have."
Steam Boiler Install
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+27

Response time2 days
Response rate100%
4 neighbors recently requested a quote
Avatar for Pro Heating & Cooling
Pro Heating & Cooling
4.9(
25
)
Ductless Mini-split A/C - Install or Replace

Serving Cohasset, MA and surrounding areas

Approved

In business since 2012

Free estimates

Emergency services offered

"My 30 year old boiler, with much fanfare chose to conk out, leaving me without heat as an impending snow storm was in the forecast. After getting outrageous quotes from another HVACs for a new boiler, I lucked out in finding Pro Heating. When Sean learned I was without heat, he gathered his A team and within a couple of days (other companies were saying it would be weeks)installed a high efficiency boiler that was less costly and is far superior to the less efficient boilers that the other companies quoted. Sean and his team are incredibly knowledgeable and professional. I highly recommend Pro Heating and Cooling, and have done so already to friends and family!"
Oil Boiler Replacement
Single zone DMS
Single zone DMS
Two  Tankless Water Heaters
Response time2 days
4 neighbors recently requested a quote
Recommended by82%of homeowners
Avatar for A1 HVAC Plus
A1 HVAC Plus
4.1(
52
)
Central A/C - InstallCentral A/C - Service or RepairDuctless Mini-split A/C - Install or Replace

Serving Cohasset, MA and surrounding areas

Approved

In business since 2009

Free estimates

Warranties offered

"After my experience with Arthur I would try to hire him for my next home heating or air conditioning needs excellent service great modern and efficient equipment, fast response, attention to detail. thanks for helping me out Arthur. Richard B.Pembroke MA."
Work Completed
Work Completed
Condenser Installs
Mitsubishi Certification
Fujitsu Certification

+2

Response time1 day
2 neighbors recently requested a quote
Recommended by97%of homeowners
Avatar for RLF Heating & Cooling Inc.
RLF Heating & Cooling Inc.
4.9(
10
)
Central A/C - InstallCentral A/C - Service or RepairDuctless Mini-split A/C - Install or Replace

Serving Cohasset, MA and surrounding areas

Approved

In business since 2023

Free estimates

Emergency services offered

"Bob did a new mini split install for me and I couldn't be happier with the work. He was professional, timely, and had excellent communication. He was also very knowledgeable and made some great recommendations for the project. I'd recommend him to anyone looking for HVAC work."
Response time6 hrs
Response rate97%
6 neighbors recently requested a quote
Avatar for 1st Call Emergency Heating & Cooling
1st Call Emergency Heating & Cooling
5.0(
12
)
Central A/C - Service or Repair

Serving Cohasset, MA and surrounding areas

Approved

In business since 2025

Free estimates

Emergency services offered

"I could not recommend Mike enough. He cleaned our oil furnace, conducted CO safety tests, diagnosed an issue with one of our old radiators, and installed a smart thermostat, all for a fair price. He's friendly, diligent, prompt, communicative, and careful. We also appreciated the extremely detailed documentation he put together at the end of the project to cover the costs and work done. While we had quite a bit of unexpected work (which comes with living in an older house), Mike was transparent about what was urgent versus what could wait for later projects. It never felt like he was upselling us. Will continue to use Mike for any of our home heating needs."
Boiler install
Boiler install
Same Day
...
Showing 1-10 of 337

FAQs for air conditioning projects in Cohasset, MA

Most professional HVAC technicians require two to three hours to complete an expansion valve replacement. The timeframe depends on your unit's accessibility and whether additional repairs are needed. The process involves recovering refrigerant, removing the old valve, installing the new component, and recharging the system. Scheduling during less busy seasons may result in more convenient appointment times.

Operating your air conditioner with a malfunctioning expansion valve isn't advisable. Continuing to run the system could potentially damage other components, particularly your compressor, which is significantly more expensive to replace. If you notice performance issues like inconsistent cooling or unusual noises, it's best to have your system inspected before continuing regular use.

Expansion valves don't have a standard replacement schedule, as their longevity depends on system usage, maintenance frequency, and environmental factors. Regular professional maintenance helps identify potential valve issues before they cause system failure. Having your HVAC system serviced annually allows technicians to monitor component condition and recommend preventative replacements when necessary.

Refrigerant leaks require prompt professional attention. If your expansion valve is leaking, you'll likely notice reduced cooling performance and possibly hear hissing sounds near the unit. Addressing leaks quickly prevents further system inefficiency and avoids the environmental impact of released refrigerant. Your HVAC technician will need to repair the leak and recharge the system with the proper refrigerant type and amount.

Because many AC issues present similar symptoms, professional diagnosis is recommended. Problems like inadequate cooling, inconsistent temperatures, or strange noises could indicate expansion valve issues, but might also stem from refrigerant leaks, electrical problems, or airflow restrictions. A qualified HVAC technician has the tools and expertise to accurately identify the root cause and recommend appropriate repairs.

The Cohasset, MA homeowners’ guide to air conditioning services

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