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TRUSTED BY OLD SAYBROOK, CT HOMEOWNERS

  • Average homeowner rating star icon4.6
    Average homeowner rating
  • Verified reviews icon127
    Verified heating and air conditioning services reviews

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

Avatar for Onofreo Home Comfort Systems, LLC
Onofreo Home Comfort Systems, LLC
4.9(
38
)
Gas Furnace / Forced Air Heating System - InstallOil Furnace / Forced Air Heating System - InstallHeat Pump - Install or Replace+5 more

Serving Old Saybrook, CT and surrounding areas

Approved

In business since 2018

Free estimates

Small jobs welcome

"I hired Onofrio to replace my gas furnace and install a new AC unit. A few months later when I had a minor gas leak in the pipes (unrelated to their install), they came out within a few hours to fix the leak. What REALLY impressed me was how they came to bat for me when the gas company initially said that it could be as long as next day to turn my gas back on after the repair. This was during the coldest days of the winter and I was very grateful that Onofrio stayed invested in me until everything was remedied."
Gas Furance
Ductless Heat Pump Installation
New Navien System
Old Oil Furance
Ductless Heat Pump Installation

+27

Response time1 day
Response rate86%
74 neighbors recently requested a quote
Avatar for Cawiamca Heating, Cooling, and Electrical
Cawiamca Heating, Cooling, and Electrical
5.0(
96
)
Central A/C - InstallHeat Pump - Install or ReplaceOil Furnace / Forced Air Heating System - Install+41 more

Serving Old Saybrook, CT and surrounding areas

Approved

Super Service Award Winner

In business since 2014

Free estimates

Emergency services offered

"Exceedingly STELLAR work; BEYOND professional decorum elicited by the company’s OWNER AND staff MEMBERS (specifically the technicians that performed the installation). Overall, we HIGHLY recommend this company to neighbors, family, friends, coworkers & even strangers in our community that may be in need of any HVAC or others services for their homes and/or businesses. Financially, they were on par with our anticipated costs for the work we needed done. FAST, QUALITY WORK that we’d NEVER hesitate calling on again for any future needs that this EXCEPTIONAL, ‘5-star worthy’ company provides! Thank you especially to Ron, Carlos and Brandan… we truly enjoyed meeting you and the pleasure of your company while you worked diligently in our home was all ours. Perhaps this review seems “over the top”or contrived, but we truly wanted to reward this company properly with a review that sufficiently and congruently matched their “talk with the walk” behavior. As you (a co-consumer) know there are so few these days that that elicit good, old- fashioned business ethics. We want you to know this was honestly a job TRULY well done!"
Variable Refrigerant Flow Cold Weather Heat Pump in East Lyme
VRF Cold Weather Heat Pump in Groton
Additional Photos
Additional Photos
Response time8 hrs
31 neighbors recently requested a quote
Recommended by92%of homeowners
Avatar for Cawiamca, LLC
Cawiamca, LLC
5.0(
43
)
Gas Boiler or Radiator Heating System - InstallGas Boiler or Radiator Heating System - Install - For BusinessGas Boiler or Radiator Heating System - Repair+11 more

Serving Old Saybrook, CT and surrounding areas

Approved

In business since 2014

Free estimates

Emergency services offered

"Without Question the BEST! If you need help with a replacement furnace or pretty much ANY HVAC services please do your self a favor and hire this company! I witnessed first hand quality at its finest with this team. Within two days from the service call they were able to replace my furnace. Not only did the replacement go down perfectly but I feel they also saved my life by honoring me with what I d consider to be the Very Best quote and service in town or around - PERIOD! I told em I d always seek their help following this replacement job and I am sure for as long as they exist I ll be they re number one advocate. Absolutely professional, absolutely worth your time with results I m betting will last you. Without a Doubt if you need help give this group your first shot at remedy. I m positive you ll be satisfied! Thank you guys again :)"
Steam Boiler
New Boiler Install
New Home Saybrook
Custom built in in progress
Addition in progress

+2

Response time4 hrs
Recommended by100%of homeowners
Avatar for Scotti Mechanical Services
Scotti Mechanical Services
4.7(
63
)
Central A/C - Service or RepairDucts & Vents - Install or ReplaceCentral Air Cleaner - Repair or Service

Serving Old Saybrook, CT and surrounding areas

Approved

In business since 2020

Free estimates

Emergency services offered

"I feel fortunate to have been able to meet Chris and have him fix my HVAC issues. He was prompt, excellent at communicating, and also is a great listener. The cost of my service wasn't low due to what was needed but it was more affordable than other quotes I'd recieved; some of the others who had spoken to me on the phone were indicating rates that were 50% higher than what Chris charged for the same exact product! I'll gladly hire him for future work. I've already given his number to others with HVAC needs."
Response time5 hrs
15 neighbors recently requested a quote
Recommended by85%of homeowners
Select Mechanical Services, Inc.
4.5(
58
)
Gas Furnace / Forced Air Heating System - InstallHeat Pump - Install or ReplaceOil Furnace / Forced Air Heating System - Install+38 more

Serving Old Saybrook, CT and surrounding areas

Approved

In business since 2014

Emergency services offered

Credit card accepted

"Fast and excellent service. The service tech was courteous, explained what he did and the issue with my furnace was resolved. The charge was slightly more than expected but well worth the price. Very happy customer and I will use them again!"
Response time1 day
90 neighbors recently requested a quote
Recommended by90%of homeowners
Avatar for Everclean Air LLC
Everclean Air LLC
4.8(
44
)
Air Ducts & Vents - Clean

Serving Old Saybrook, CT and surrounding areas

Approved

Super Service Award Winner

In business since 2023

Free estimates

Emergency services offered

"Arrived and got started right away. I paid him upfront and had to shower and change to head out for evening. I received pictures taken of a portion of the duct, was disappointed I could not see to the end of the vent clean out. My other concern is how the service tech left the dryer vent curled up and partially crushed as he put the dryer back in place, and then took this picture to display it. It would seem obvious that once you saw the vent like that you would correct it. Not happy with that."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+2

Response time7 hrs
Response rate100%
7 neighbors recently requested a quote
Avatar for 888-I-DO-DIRT
888-I-DO-DIRT
4.5(
381
)
Air Ducts & Vents - Clean

Serving Old Saybrook, CT and surrounding areas

Approved

In business since 2004

Free estimates

Credit card accepted

"Alex was great! Courteous, responsive, prompt, friendly, but more importantly, honest. The job couldn’t be done because of the structure of my HVAC system, yet Alex (and Vinny) took the time to explain the problem and tried, albeit unsuccessfully, to seek an alternative solution. I have such respect for his honesty. I highly recommend using this company, for that reason alone."
Sample Cleanings
Sample Cleanings
Sample Cleanings
Sample Cleanings
Sample Cleanings

+11

Response time4 hrs
5 neighbors recently requested a quote
Recommended by97%of homeowners
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Heating and Air Conditioning FAQs, answered by experts

Signs that your A/C system needs professional service include increased energy bills, uneven or poor cooling, loud or unusual noises, and frequent cycling.

No, it’s not normal for AC vents to drip condensation. A sweating AC vent is a sign of something wrong and can lead to issues like air duct rust or mold growth. Your HVAC unit might not be working efficiently because of a dirty filter or clogged ducts. Alternatively, your ductwork might not have adequate insulation, which allows the cool air in the ducts to meet the humid air outside, causing condensation. 

Yes, a frozen AC unit can affect your indoor air quality since the reduced airflow won't be as effective at removing air pollutants, like dust and other allergens. Additionally, ice around the unit can create excess moisture, leading to mold and mildew that can damage your home if you don’t catch it early.

The simplest indicator is how long it’s been since your last tune-up. You should schedule an annual AC tune-up each spring. Beyond that, there are multiple signs that your AC needs a quick check by a professional. These issues include higher-than-average energy bills, decreased air flow from vents, higher indoor temperatures, and an air conditioning unit that stays on all the time or frequently turns on and off.

A new HVAC system can increase your home's value by about 5% to 7%, which can translate to an added value of $2,500 to $3,000. The return on investment (ROI) can be around 30%, especially if you upgrade the entire system, including ductwork and insulation. Adding modern features like a smart thermostat can further increase your home’s value by making the heating and cooling systems more efficient and convenient. However, since a new unit can cost $10,000 or more to install, it's important to weigh the upfront cost against the potential increase in home value. For a specific assessment, it's best to consult a local AC installer.

The Old Saybrook, CT 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.