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  • 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%
80 neighbors recently requested a quote
Avatar for Cawiamca Heating, Cooling, and Electrical
Cawiamca Heating, Cooling, and Electrical
5.0(
97
)
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
32 neighbors recently requested a quote
Recommended by91%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
14 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
84 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

"I wanted to clean a second floor dryer vent hose that was loaded solid with lint. It was worse than I thought! Packed solid! It became evident that this was a messy and dangerous situation as it was a fire hazard. Through Angi I found Everclean and the co. was a perfect fit. HVAC companies don’t do dryer vents. Justin from Everclean was awesome and got the problem straightened out. He even discovered the dryer vent had become disconnected from outside dryer vent door! I can’t fit through the narrow attic hatchway as my shoulders are a bit too wide, so I depended on Justin. Finally, everything is buttoned up, and our clothes now dry in half the time. Cost was moderate and was money well invested. Dryer vent fire danger is now negligible compared to before. Along with neighbor hatred danger. I would hire Everclean again if needed again."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+2

Response time7 hrs
Response rate100%
6 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
4 neighbors recently requested a quote
Recommended by97%of homeowners
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Heating and Air Conditioning FAQs, answered by experts

A 10,000-watt generator can run a small to mid-sized central AC unit (typically up to 3 tons or 36,000 BTU) along with a few other appliances. However, larger AC units or additional loads will require a bigger generator. Consult a local generator installer to ensure you add the correct size generator to your home.

Fixing a leak in an AC unit costs $200 to $1,600, depending on the type of leak and any related damage. But depending on the age and condition of your AC, it might make more sense to replace the AC unit instead of repairing it. If your AC is only a few years old and relatively problem-free, then repairing it is the right call. But if it’s nearing a decade old and has other issues, consider replacing it.

Air filters with a high MERV rating, 11 or above, shouldn't cause airflow problems in most residential systems. However, the airflow can be restricted in some HVAC systems if they aren't designed for high MERV ratings. If in doubt, a local duct installer should inspect your ductwork so that you know what your system can handle.

Replacing both an AC and a furnace takes a full day on average, ranging from eight to 12 hours. The process involves removing the old units, installing the new ones, and ensuring all connections are properly made. If both systems are being replaced simultaneously, it can take longer than installing a furnace alone, so plan accordingly.

Yes, it is possible. An electrical fire can break out if the compressor has inadequate ventilation. When it overheats but doesn't have a proper thermal cutout, this can cause the motor to short-circuit and catch fire. This risk is exacerbated if flammable materials, like dust and fallen leaves, are clogging the unit. The compressor overheating won't start a fire by itself, but poor maintenance and installation can increase the risk once it hits its breaking point and short-circuits.

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.