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Top-Rated Geothermal heating or cooling system installers in Central Islip - Updated Nov 2026

Avatar for MSD Heating & Cooling
MSD Heating & Cooling
4.9(
74
)
Geothermal Heating or Cooling System - Install

Serving Central Islip, NY and surrounding areas

Approved

In business since 2002

Free estimates

Emergency services offered

"They responded to my home quickly and professionally. The technician was very knowledgeable and candid and saved me unnecessary expenses. They fixed the issue and has our ac back up and running within an hour and made sure everything was clean before they left. Will definitely recommend them."
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+1

2 neighbors recently requested a quote
Recommended by96%of homeowners
Avatar for All Weather Heating & Cooling
All Weather Heating & Cooling
4.5(
70
)
Geothermal Heating or Cooling System - Install

Serving Central Islip, NY and surrounding areas

Approved

In business since 1969

Free estimates

Emergency services offered

"I had the equipment replaced, a brand new, super high efficiency, fancy, lovely stuff. It's a central air system, and it's Lennox equipment. It's high efficiency. You can get it for less than that, but you're not gonna get the high efficiency quiet and all that kind of stuff. I had received other quotes which were like more money for the same system. I have been using them since 1986. No complaints. They do their thing, and I can't fault them. I have a service contract with them for this."
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+13

Response time3 days
7 neighbors recently requested a quote
Recommended by94%of homeowners
Avatar for Surefire Mechanical Corporation
Surefire Mechanical Corporation
4.5(
157
)
Geothermal Heating or Cooling System - Install

Serving Central Islip, NY and surrounding areas

Approved

In business since 2013

Free estimates

Emergency services offered

"Called on a Sunday evening and there was a serviceman at my door by 8 AM Monday morning. Mike, the serviceman, was extremely knowledgeable, professional and courteous. Will recommend this company to anyone I know who needs air conditioning or servicing. Thanks again for the speedy service and knowledgeable serviceman who repaired the air conditioner quickly!"
4 Zone Navien Boiler
1st Floor AC System
Hi Efficient Heat and Hot Water
Snow melt sensor
Manifold

+14

Response time10 mins
Recommended by97%of homeowners
Avatar for Elm Air Conditioning Corp
Elm Air Conditioning Corp
4.4(
82
)
Geothermal Heating or Cooling System - Install

Serving Central Islip, NY and surrounding areas

Approved

In business since 1952

Free estimates

Warranties offered

"The entire experience from the discussions with the company rep Scott O, to the completion of the installation was excellent. The installers were courteous, knowledgeable and efficient. The Mitsubishi unit itself is an excellent product. Cools quickly, quietly, and is multifunctional. The installers Brian and Moses did the job in a courteous, knowledgeable and efficient manner. All stages of the job went smoothly. Functions of the unit and use of the remote were explained thoroughly and a booklet was provided that reinforces the information. Cleanup was excellently done. I am very pleased with the communication with Scot O choosing the product to be installed, getting questions answered as well as with the knowledgeable, courteous and efficient installers. I highly recommend Elm Air Conditioning."
Additional Photos
14 neighbors recently requested a quote
Recommended by77%of homeowners
Avatar for Prime Air Long Island, Inc.
Prime Air Long Island, Inc.
5.0(
6
)
Geothermal Heating or Cooling System - Install

Serving Central Islip, NY and surrounding areas

Approved

Free estimates

Emergency services offered

Small jobs welcome

"Had brand new AC set up. Job done right, fare price, great customer service. If you’re looking for a reliable HVAC contractor on Long Island for AC installation, emergency AC repair, or full system replacement, I highly recommend them."
Condenser coil cleaning
Condenser cleaning
Condenser cleaning
Condenser cleaning
20 neighbors recently requested a quote
Avatar for Temperature Zone Corp
Temperature Zone Corp
4.7(
48
)
Geothermal Heating or Cooling System - Install

Serving Central Islip, NY and surrounding areas

In business since 1987

Free estimates

Emergency services offered

"Kevin and Sal did a phenomenal job installing our new state-of-the-art HVAC system. This father-and-son team is incredibly hardworking, professional, efficient, reliable and accommodating. Kevin, who has worked in this business for many years and is extremely knowledgeable about energy-efficiency and environmental improvements, shares his expertise with his son, and it’s a pleasure to see them work side by side. We were referred to Kevin and Sal by our nephew, who had found them on Angi’s list when he needed a new boiler. He had told us they are customer-focused and strive to do the best possible job from start to finish—and he was right! What's more, after completing our HVAC installation right on schedule and reviewing every aspect of the new system with us, they left our home cleaner than it was before. We couldn’t be more impressed with all of their high-quality work."
Heating & A/C Project
Condenser Location Change
Boiler Removal and NEW Install
Heating & A/C Project
The Hollywood

+56

Response time1 day
Response rate100%
Recommended by95%of homeowners
Avatar for Harli Comfort
Harli Comfort
5.0(
20
)
Geothermal Heating or Cooling System - Install

Serving Central Islip, NY and surrounding areas

In business since 2022

Free estimates

Emergency services offered

"The process of meeting for an estimate through installation was seemless! The 2 men did an excellent job installing my mini split and cleaned up before leaving. I highly recommend this company and would definitely use them again in the future!"
Response time2 days
Response rate100%
Recommended by95%of homeowners
Avatar for Central Suffolk Mechanical LLC
Central Suffolk Mechanical LLC
4.8(
22
)
Geothermal Heating or Cooling System - Install

Serving Central Islip, NY and surrounding areas

In business since 2009

Free estimates

Emergency services offered

"Joe responded to my online "request for quote" within an hour of me posting it. He offered to come the next morning and arrived exactly on time. He assessed within 10 minutes that a capacitor in one of our units had blown, probably due to a line surge from a lightning storm, and had a replacement capacitor in his truck. The capacitor was replaced and the repair completed in 30 minutes. He then a quick review of our entire system to assess its overall health. My experience with Joe was so good that I have asked him to send me a service contract to maintain my AC system going forward."
Recommended by95%of homeowners
Avatar for Air Vent Medics
Air Vent Medics
4.6(
42
)
Geothermal Heating or Cooling System - Install

Serving Central Islip, NY and surrounding areas

In business since 1960

Credit card accepted

"It Went Very Well!!  They were very helpful.  The window in my apartment is located in an alcove in my studio apartment which makes it very complicated.  They lead me in the right direction. Installed an awesome unit!!  Would definitely use them again and recommend them highly!!!!!!!
"
Air Vent Medics
Air Vent Medics
Mike's Air Conditioning Family Room
Mike's Air Conditioning Bedroom
Mike's Air Conditioning Kitchen

+1

Recommended by97%of homeowners
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