Furnace Services on Long Island, NY
Keep your home warm and comfortable with NJM’s professional furnace services. We provide expert furnace installation, repair, replacement, and maintenance for residential and commercial heating systems across Nassau and Suffolk County — all performed by licensed and experienced HVAC technicians.
Furnace Installation • Repairs • Replacements • Maintenance
Reliable Furnace Heating Solutions Backed by 33+ Years of Experience
Whether you're installing a new furnace, upgrading an outdated system, or repairing a heating issue, NJM Mechanical and Contracting delivers dependable, code-compliant furnace services throughout Long Island. Our technicians work on all major fuel types and furnace models, ensuring efficient performance, safe operation, and long-lasting comfort during the colder months.
From detailed diagnostics to full installations, we provide furnace solutions tailored to your home’s size, heating needs, and energy goals — always with clear communication and honest pricing.
Professional installation of new, energy-efficient furnaces designed to provide consistent heat and lower monthly fuel costs.
Rapid diagnostics and repairs for ignition issues, airflow problems, electrical failures, and malfunctioning components.
Upgrade your aging or inefficient furnace with a modern, high-performance system built for improved safety, comfort, and efficiency.
Comprehensive heating tune-ups including cleaning, inspections, filter replacement, and safety checks to prevent breakdowns and extend furnace lifespan.
Expert Radiant Heating Solutions
Backed by Over 33 Years of Experience
Why Choose NJM for Furnace Installation, Repair & Maintenance?
Expert Furnace Heating Solutions Backed by Over 33 Years of Experience
Fully authorized professionals trained to service and install furnaces safely and effectively.
We offer high-efficiency furnaces that reduce fuel consumption and improve long-term heating performance.
Quick response times to restore heat safely during unexpected furnace failures.
All furnace installation and replacement work follows Long Island heating codes and safety standards.
Decades of professional experience mean we install fixtures, piping, and full systems correctly the first time — with workmanship that lasts.
No hidden charges or surprise add-ons. You’ll receive a clear estimate outlining exactly what your installation includes.
Burner & Ignition System Inspection
Testing burners, flame sensors, and ignition components for reliable startup and safe operation.
Electrical & Control System Testing
Checking wiring, relays, thermostats, and safety controls for accurate heating response.
Heat Exchanger Examination
Evaluating the heat exchanger for cracks, corrosion, or damage that may pose safety risks.
Filter & Ventilation Assessment
Reviewing filter condition and venting systems to prevent airflow restrictions or carbon monoxide issues.
Blower Motor & Airflow Review
Ensuring proper airflow, motor function, and duct performance for consistent heating.
Long Island Code Compliance Review
Ensuring the furnace system meets all Nassau and Suffolk County heating regulations.
Trusted Heating Expertise for Long Island Homes & Businesses
Our Furnace Safety & Inspection Services Include:
NJM provides detailed furnace inspections to ensure your heating system operates safely, efficiently, and in compliance with Long Island building codes.
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.
Find Heating Services Near You!
Service Area Links:
- Long Island
- Nassau County
- Suffolk County