Top-rated heating and air conditioning pros.

Get matched with top heating and air conditioning pros in Old Lyme, CT

There are 9 highly-rated local heating and air conditioning pros.

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  • Average homeowner rating star icon4.4
    Average homeowner rating
  • Verified reviews icon50
    Verified heating and air conditioning services reviews

Verified Reviews for Heating And Air Conditioning Service pros in Old Lyme, CT

*The Angi rating for Heating And Air Conditioning Service companies in Old Lyme, CT is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Heating And Air Conditioning Service needs.

*The HomeAdvisor rating for Heating And Air Conditioning Service companies in Old Lyme, CT is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Heating And Air Conditioning Service needs.

Last update on October 04, 2025

Find Heating and air conditioning pros in Old Lyme

Avatar for Cawiamca Heating, Cooling, and Electrical

Cawiamca Heating, Cooling, and Electrical

6 Center Rd W
5.00(
45
)
•Approved Pro

Cawiamca Heating, Cooling, and Electrical

6 Center Rd W
5.00(
45
)
•Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
166 local quotes requested

FULL SERVICE HEATING, COOLING, AND ELECTRICAL SERVICES. CERTIFIED COLD WEATHER HEAT PUMP INSTALLER -- REBATES AVAILABLE!! Cawiamca Heating, Cooling and Electrical-- Offers top quality heating & cooling & electrical services. Professional Service and Guaranteed Quality Workmanship. Cawiamca is a trusted, BBB A+ Rated Contractor serving the Connecticut Shoreline since 2014.

"Outstanding company and outstanding work performance. Out of many estimates, Cawiamca offer came by e-mail in 24 hrs from the visit. After few clearing Q&A, final detailed contract was sign in person in 48 hrs. All communication was done with the owner OVER THE WEEKEND promptly, with understanding, concern and his willingness to help. Totally impressive for business owner to do that on weekend. Best estimate , best professional work and my gratitude, thanks and best wishes to owner Mr. Ron Pelletier."

Michael K on September 2025

FULL SERVICE HEATING, COOLING, AND ELECTRICAL SERVICES. CERTIFIED COLD WEATHER HEAT PUMP INSTALLER -- REBATES AVAILABLE!! Cawiamca Heating, Cooling and Electrical-- Offers top quality heating & cooling & electrical services. Professional Service and Guaranteed Quality Workmanship. Cawiamca is a trusted, BBB A+ Rated Contractor serving the Connecticut Shoreline since 2014.

"Outstanding company and outstanding work performance. Out of many estimates, Cawiamca offer came by e-mail in 24 hrs from the visit. After few clearing Q&A, final detailed contract was sign in person in 48 hrs. All communication was done with the owner OVER THE WEEKEND promptly, with understanding, concern and his willingness to help. Totally impressive for business owner to do that on weekend. Best estimate , best professional work and my gratitude, thanks and best wishes to owner Mr. Ron Pelletier."

Michael K on September 2025

Avatar for The Guild

The Guild

11 Lakeview Avenue
5.00(
4
)
•Approved Pro

The Guild

11 Lakeview Avenue
5.00(
4
)
•Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
3 years of experience

The Guild is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we work smart, and it gets done right.

"Extremely professional and patient and above all else honest and knowledgeable! I would recommend this company to anyone you be a fool, not to go with them"

Jennifer F on June 2023

The Guild is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we work smart, and it gets done right.

"Extremely professional and patient and above all else honest and knowledgeable! I would recommend this company to anyone you be a fool, not to go with them"

Jennifer F on June 2023

Avatar for Cariati Mechanical, LLC

Cariati Mechanical, LLC

52 Olde Orchard Rd
5.00(
5
)
•Approved Pro

Cariati Mechanical, LLC

52 Olde Orchard Rd
5.00(
5
)
•Approved Pro
Super Service Award
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
3 years of experience

Cariati Mechanical, LLC is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers interests, and make their concerns the basis of our business.

"Very professional and an excellent workmanship. I highly recommend Nick and his team at Cariati Mechanical."

Charles S on December 2024

Cariati Mechanical, LLC is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers interests, and make their concerns the basis of our business.

"Very professional and an excellent workmanship. I highly recommend Nick and his team at Cariati Mechanical."

Charles S on December 2024

Avatar for Irie Energy Heating & Cooling

Irie Energy Heating & Cooling

PO Box 22
4.89(
19
)
•Approved Pro

Irie Energy Heating & Cooling

PO Box 22
4.89(
19
)
•Approved Pro
Customers say: True professional
5 years of experience
Free onsite estimate

Irie Energy Heating & Cooling is dedicated to providing our customers with the best quality and craftsmanship. We are here to build relationships with our customers and communities and to provide our employees with a great place to work. We look forward to working with you!

"Ryan was very knowledgeable, professional and responsive; and helpful with all our questions. He arrived as scheduled, worked quickly and cleaned up completely when done. Highly recommended."

Julie Q on March 2024

Irie Energy Heating & Cooling is dedicated to providing our customers with the best quality and craftsmanship. We are here to build relationships with our customers and communities and to provide our employees with a great place to work. We look forward to working with you!

"Ryan was very knowledgeable, professional and responsive; and helpful with all our questions. He arrived as scheduled, worked quickly and cleaned up completely when done. Highly recommended."

Julie Q on March 2024

Avatar for Shoreline Electric Services, LLC

Shoreline Electric Services, LLC

15 Pent Rd
4.31(
8
)
•Approved Pro

Shoreline Electric Services, LLC

15 Pent Rd
4.31(
8
)
•Approved Pro
Customers say: Quick response
55 local quotes requested
2 years of experience

Shoreline Electric Services is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our business.

"very helpful and kind"

Tina D on April 2025

Shoreline Electric Services is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our business.

"very helpful and kind"

Tina D on April 2025

Avatar for Scotti Mechanical Services

Scotti Mechanical Services

7 Pond Edge Dr
4.80(
58
)
•Approved Pro

Scotti Mechanical Services

7 Pond Edge Dr
4.80(
58
)
•Approved Pro
Customers say: Quality work
23 local quotes requested
5 years of experience

Here at Scotti Mechanical Services I have over 30 years of HVAC experience in oil heating (NO gas work) and air conditioning. I pride myself on my diligence and attention to detail, and make a dedicated effort to reduce repair/installation cost. There is no job too big or too small that I can't handle in a timely manner, please don't hesitate to call today. I look forward to earning your business. I do provide an after-hours emergency service.

"He didn't do any air side of furnace replaced ignitor we had loud bang noise it was because we needed the furnace to be cleaned and vacuumed I saw pics from real furnace guy it was full of rust and cresol flakes he never vacuumed anything terrible job never fixed problem"

Kenneth B on October 2024

Here at Scotti Mechanical Services I have over 30 years of HVAC experience in oil heating (NO gas work) and air conditioning. I pride myself on my diligence and attention to detail, and make a dedicated effort to reduce repair/installation cost. There is no job too big or too small that I can't handle in a timely manner, please don't hesitate to call today. I look forward to earning your business. I do provide an after-hours emergency service.

"He didn't do any air side of furnace replaced ignitor we had loud bang noise it was because we needed the furnace to be cleaned and vacuumed I saw pics from real furnace guy it was full of rust and cresol flakes he never vacuumed anything terrible job never fixed problem"

Kenneth B on October 2024

Avatar for Diamond Plumbing & Heating, LLC

Diamond Plumbing & Heating, LLC

1 Route 165
4.55(
58
)
•Approved Pro

Diamond Plumbing & Heating, LLC

1 Route 165
4.55(
58
)
•Approved Pro
Super Service Award
Customers say: True professional
25 local quotes requested
22 years of experience

We're a well established business with over 25 years of unmatched expertise. Customer preference and priorities are always first. We're very timely with our work and never lose attention to detail. Diamond Plumbing and Heating, LLC, has built a reputation for quality work with each satisfied customer. Our sense of pride is apparent in every restoration we complete. Call Diamond Plumbing & Heating today and we'll be there in your time of need.

"Amilcar was professional from the start to the finish. He was efficient too. He was very neat and kept the work area clean. I will certainly call on Diamond Plumbing and Heating again should I need service of the type they provide"

ANTHONY F on January 2025

We're a well established business with over 25 years of unmatched expertise. Customer preference and priorities are always first. We're very timely with our work and never lose attention to detail. Diamond Plumbing and Heating, LLC, has built a reputation for quality work with each satisfied customer. Our sense of pride is apparent in every restoration we complete. Call Diamond Plumbing & Heating today and we'll be there in your time of need.

"Amilcar was professional from the start to the finish. He was efficient too. He was very neat and kept the work area clean. I will certainly call on Diamond Plumbing and Heating again should I need service of the type they provide"

ANTHONY F on January 2025

J&J home improvement

32 Walden Ave
No reviews yet

J&J home improvement

32 Walden Ave
No reviews yet
5 years of experience

Plumbing, painting, carpentry, flooring, ductwork, Heating. We are a family and veteran owned company. We take pride in everything we do big or small!! We are never completed with a job untill the customer is 100% satisfied!

Plumbing, painting, carpentry, flooring, ductwork, Heating. We are a family and veteran owned company. We take pride in everything we do big or small!! We are never completed with a job untill the customer is 100% satisfied!

Express Heating & Cooling LLC

49 Dalton Avenue
No reviews yet

Express Heating & Cooling LLC

49 Dalton Avenue
No reviews yet
12 years of experience

RESIDENTIAL & COMMERCIAL All types of Heating & Cooling Services: -Repair, Maintenance, Installation, Service plans -Boiler, Furnace, Water Heater, Baseboard & Cast-Iron Radiators Oil, Gas & Propane, Refrigeration & A/C. "Fully Licensed & Insured Contractor"

RESIDENTIAL & COMMERCIAL All types of Heating & Cooling Services: -Repair, Maintenance, Installation, Service plans -Boiler, Furnace, Water Heater, Baseboard & Cast-Iron Radiators Oil, Gas & Propane, Refrigeration & A/C. "Fully Licensed & Insured Contractor"

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Heating and Air Conditioning questions, answered by experts

No, you should not run an air conditioner with a Freon leak. If you think your AC unit is leaking refrigerant, shut it off immediately. When you keep using a leaky air conditioner, it could damage the unit and release more refrigerant. After turning off the AC, have an HVAC pro come take a look at the unit.

An air conditioner’s watt usage depends on multiple factors, including the type of AC unit, its size, and how often you use it. With that said, most central air conditioners consume between 3,000 and 3,500 watts. Meanwhile, window AC units use 900 to 1,400 watts, and portable air conditioners consume 2,900 to 4,100 watts.

There are a few things you can do to make your AC repair technician’s job easier and your home more comfortable while you wait for AC repair:

  • Cut back trees, shrubs, and weeds around the outdoor compressor 

  • Clear a pathway inside and outside to your AC components

  • Set up a ladder for attic access if necessary

  • Pull your window AC out of the window and place in an easily accessible spot

  • Supplement with fans and open windows to help keep your house comfortable

The standard HVAC warranty is around five years. Still, many brands offer an extension to 10 years if you register the product within a specific timeframe, typically 60 to 90 days post-purchase or HVAC installation. Over the past decade, warranty periods have substantially increased, shifting from 3-5 years in the 90s to the now-prevalent 10+ year warranties. Both warranty types cover parts failing due to manufacturer defects, incurring no additional costs. Some manufacturers provide extended warranties surpassing the usual 15- to 20-year window, though these often involve extra fees. 

Yes, you can put an AC unit on the roof of your home or commercial building. For proper installation, you’ll need to ensure the roof surface is flat, it’s accessible for maintenance and cleaning, and an AC installation pro agreed that your home is a candidate for package units. Don’t forget to consider the climate in your area, as homes that experience frequent tropical storms or hurricanes may not benefit from this type of system.

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The Old Lyme, 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.

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