GMG Hvac Inc.
“Very clean and neat set work area up with proper protection and completed repairs in a timely manner.”
Best HVAC Contractors near Islip, NY
We have 2 companies in Islip on file, and both are on this list, along with 13 from towns including East Islip (2, 0 mi), Bay Shore (2, 3 mi) and Central Islip (2, 3 mi).
4 open 24/7 · 13 open weekends · 14 rated 4.5+ · 6 show a license
Data verified October 18, 2026
Dashing Dan's Plumbing & Heating Inc.
“He is very knowledgeable having 33 years of experience and such a nice guy.”
MSD Heating & Cooling
“Called him yesterday ans showed up same day and was able to fox the issue.”
Century Utilities System
“We had Century abandon and replace a basement oil tank with a new Roth tank outside the house.”
Great River Fuel Oil
“They are professional, fairly priced and the quality of their work was outstanding.”
Jovial Stove Shop
“Ordered my stove when it was delivered Joe son did the install the were very clean and neat did a great job love my stove works perfect.”
The 15 companies listed for Islip, NY work on furnaces, heat pumps and air conditioners. Each profile repeats what the company publishes about its hours, its license and the equipment it fits, alongside ratings and quotes drawn from public reviews.
Area overview: Islip, NY
The 15 companies on this page are rated from 4.0 to 5.0 across 2,865 reviews; 9 have 50 or more reviews and 14 are rated 4.5 or higher. When customers rate these companies on specific qualities, they most often praise professionalism (88%), responsiveness (80%) and quality (79%). The topics that come up most in reviews of the companies on this page are "price", "cleanliness" and "estimates". 4 are open around the clock; 13 are open on Saturdays and 6 on Sundays. 6 show a license on their websites and 2 have a BBB rating of A or A+. Domain records put 8 websites of the companies on this page at ten or more years old; the oldest dates from 1999. 4 offer emergency call-outs; 6 offer financing or payment plans; 6 give free estimates; 7 are family- or locally-owned and 5 list coupons or special offers. We have a website on file for 13 of the companies on this page; 11 publish a contact page; 8 list a public email and 2 take bookings online. We count these figures across the companies on this page; distances are straight-line, and hours and prices change, so confirm the details with the company before you book.
Why do some of these firms show another city?
2 of the 15 companies are based in Islip; the others come from other towns within 10 mi. This trade drives to you, so a shop over the county line is normal. Ask whether your address carries a travel charge.
RK Heating & Cooling Services Inc
“The new heat pump is working perfectly and has already made a noticeable difference with cooling my home as Summer begins.”
Integrated Geothermal
“They were nice, professional, and did an amazing job..”
Sunray Services
“Spencer performed the most comprehensive AC maintenance (May 2024) that I have experienced to date.”
Long Island's Burner King
“LI Burner king professionally installed a cast iron boiler with a lifetime warranty and a 1 year service contract for free.”
Ljv Mechanical
“Extremely high quality install and they left the site cleaner than when they arrived.”
Varsity Home Service
“Ray came out to my parents house and did a fantastic job.”
Retro Hot Water & Heating
“Thank you Retro Hot Water, they went above and beyond to figure out the problem I was having and coming up with a few solution.”
Delcore Electric
“They were able to successfully install our EV Level 2 charger with 0 issues.”
Jen Air Inc
“I am super amazed at the level of customer services company provides from the receptionist to the service text to the sales rep.”
Why these companies made our list
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