Heating Services on Long Island, NY
Reliable, licensed, and professional heating specialists serving Nassau and Suffolk County. From furnace repairs to boiler replacements and complete heating system installations, NJM delivers trusted solutions that keep your home or business warm and energy-efficient all year long.
Available 24/7 For Emergency Heating Service
Trusted Heating Experts for Nassau and Suffolk County
Licensed heating professionals with over 33 years of experience serving residential and commercial properties across Long Island.
NJM provides expert heating system installations and replacements for homes and businesses across Long Island, NY. From new furnaces to complete boiler systems, our licensed professionals ensure reliable performance, safety, and long-lasting comfort.
Enjoy even, consistent warmth with NJM’s radiant floor heating solutions. Installed beneath your flooring, radiant systems improve comfort, reduce drafts, and provide energy-efficient heating for both residential and commercial spaces.
Our specialists quickly identify boiler issues and perform precise repairs to restore safe, energy-efficient operation. We service all major boiler types and provide routine maintenance to extend system lifespan across Nassau and Suffolk County.
Whether your furnace stops working or shows signs of failure, NJM provides fast, professional repairs and 24/7 emergency response to keep your home or business warm all winter long.
NJM installs and services high-efficiency geothermal heating systems for Long Island homes and businesses. Using the stable temperatures below ground, geothermal systems deliver reliable comfort, lower energy costs, and long-lasting performance with minimal environmental impact.
Expert Heating Solutions Backed
by Over 33 Years of Experience
Why Long Island Homeowners Trust NJM for Heating Services
With decades of experience and multiple heating certifications, NJM delivers safe, compliant, and reliable boiler, furnace, and heating system work across Long Island.
NJM operates with full licensing and insurance, ensuring every heating project meets safety standards and Long Island building codes.
Our team includes certified heating professionals trained to diagnose, repair, and install all major furnace and boiler systems with precision.
With extensive expertise across residential and commercial equipment, NJM delivers reliable solutions for boiler and furnace repairs, replacements, and upgrades.
Whether your heat goes out at night or during extreme weather, NJM provides around-the-clock emergency service to restore warmth quickly and safely.
Serving Long Island since 1991 with proven reliability and technical expertise.
Upfront quotes, no hidden fees, and clear explanations for every service.
Boiler Safety Testing
Safety checks for pressure relief valves, venting, temperature controls, and gas/water connections to prevent hazards and improve heating efficiency.
Vent & Flue System Assessment
Inspection of vents, exhaust flues, and air systems to ensure safe airflow and code compliance.
Furnace Diagnostic Evaluation
Comprehensive testing to locate failures, airflow issues, burned components, ignition problems, and more.
Combustion Analysis
Testing for proper combustion, fuel usage, and carbon monoxide safety for all boiler and furnace systems.
Emergency Shut-Off Testing
Ensuring all heating system shut-off valves function properly in case of leaks or system failure.
Code Compliance Review
We verify that your heating system meets Nassau and Suffolk County regulations — essential for upgrades, replacements, or property sales.
Trusted Heating Expertise for Long Island Homes & Businesses
Our Heating Safety & Inspection Services Include:
NJM provides advanced heating inspections, diagnostic testing, and safety evaluations to keep your system operating efficiently, safely, and fully compliant with local codes.
Find Heating Services Near You!
Service Area Links:
- Long Island
- Nassau County
- Suffolk County
What Our Long Island Clients Are Saying...
Kris
I couldn’t recommend Neil enough! From start to finish him and his team were professional, efficient and experienced. We had a job pulling up rocks and putting top soil down which I know can be a tedious job. We appreciate the work and look
Evelyn Powers
We had an ongoing issue with clogs. My daughter woke up to flooding in her bedroom from her toilet, which was not fun! This was our first time having NJM in our home. Neil was knowledgeable and gave us several options. we chose to have him use the camera to get to the root of the problem. He was able to pinpoint several issues and was able to fix clog and clean out the pipes. Neil and his crew were very professional,
Irene Cheung
I contacted NJM Mechanical because I didn’t have hot water anywhere in my house. Neil was able to diagnose the issue and get to work. My navien tankless water heater is only a year old and still under warranty. Instead of waiting on Navien to send the part so the issue can be corrected, Neil went out, found the part, purchased it,
William Lo
Great experience. Neil came out and took the time to explain everything thoroughly. He was able to fix all the errors on our Navien and have it back up and running. Following up a week later. Neil and Mike came out to redo the Navien system for proper instillation.
Unfortunatley, after there was a gas leak with our Navien system. Neil was able to get
James Farnworth
Neil from NJM was able to get my ac system up and running when others could not. He was honest with me right from the beginning and all costs were discussed before repairs began. Additionally, Neil spent time explaining to me how my system operates and the things I could do to help it run at peak performance. It was quite refreshing to experience a service technician who demonstrated the uppermost
Raul Chardon
Honest professional full of knowledge not BS. Takes pride in his craft and is a master of it.