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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

"We were desperate to find someone to repair our central air conditioning unit. We were not able to move into the house and everyone that we called was not able to accommodate us because of the recent heat wave. All Weather was able to get a technician to us within 2 days. Nuri was amazing and showed my husband how everything worked and what repairs needed to be done. By the time he left, we had a cool house and were able to set up our movers. Thanks to Angie’s list, I found a reputable company that was reliable and efficient. We can rest easy! Thank you!!!"
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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

"Overall experience was favorable and pleasant. They were able to quickly assess what was wrong and repair the problem. I highly recommend them!! I used Sure-Fire again on Dec 12, 2017 to resolve an issue with my new Nest Thermostats. They were able to come in and install a Common Power Sharing Wire and resolve my problem. This is the second time I have used them in less than two months. I would highly recommend them!! Courteous and Professional!!!"
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

"As a Full-Service Contractor and Residential Builder in Nassau County, we at HOMEREDI have relied on the Expert Team of Technicians and Installers from ELM Air Conditioning in Freeport Long Island for all of our discerning Clients HVAC requirements. The entire staff from the Operating Owners to every individual member are always willing to push the envelope forward when it comes to meeting our deadlines and delivering a superb product in a timely fashion. Not only we team up with ELM but we also capitalize on their vast reach and knowledge for our own residential air conditioning Service installation and continued maintenance Service. We highly recommend ELM Air conditioning not only to our Clients but to our Neighbors across the Island."
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
10 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

"It was fantastic! Kevin and Sal did a great job on both projects. We had 5 ductless AC units installed with 2 compressors and it went flawless. They showed up when they said they would and installed the project in a couple days. We love the new system and it really keeps the house cool. I would strongly recommend them to anyone considering AC/Heating/Plumbing projects. It’s hard to find good contractors right now but Kevin and Sal are the exceptions. Great company and even better people."
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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