Ductless Mini-Split Systems on Long Island, NY
Enjoy efficient, quiet, and customizable cooling with professional ductless mini-split services from NJM. We install, repair, replace, and maintain ductless HVAC systems for homes and businesses across Nassau and Suffolk County — providing room-by-room temperature control without the need for ductwork.
Energy-Efficient • Flexible Comfort • Zoned Cooling Systems
Reliable Ductless Mini-Split Solutions Installed by Experienced Technicians
Ductless mini-split systems offer powerful cooling, whisper-quiet operation, and flexible zone control that traditional AC systems can’t match. NJM Mechanical and Contracting provides expert installation, repairs, and maintenance for all major mini-split brands. With over 33 years of HVAC experience, we ensure proper line-set routing, electrical setup, refrigerant charging, and performance testing for long-lasting comfort.
Whether you're upgrading a room, cooling an addition, or replacing an old AC unit, NJM delivers ductless solutions designed for efficiency, comfort, and reliability.
Professional installation of single-zone and multi-zone ductless mini-split systems with proper mounting, electrical setup, and refrigerant line charging.
Fast, accurate diagnostics and repairs for refrigerant leaks, compressor failures, fan issues, sensor errors, and electrical malfunctions.
Removal of old or failing units and installation of new, high-efficiency ductless systems engineered for improved comfort and energy savings.
Seasonal tune-ups including filter cleaning, coil washing, drain clearing, and system optimization for long-term performance.
Customized layout and zoning design for homes with multiple rooms or levels, allowing independent temperature control in each space.
Repairs and replacements for damaged refrigerant lines, insulation, and condensate drains to restore safe and efficient operation.
Installation and setup of advanced mini-split controls, Wi-Fi thermostats, and smart home integrations for precise temperature management.
Expert Ductless HVAC Solutions
Backed by Over 33 Years of Experience
Why Choose NJM for Mini-Split Installation & Service?
With certified technicians and decades of hands-on experience, NJM delivers reliable and efficient cooling services for homes and commercial properties.
Professionally trained to install and service all major ductless mini-split brands.
Mini-split systems provide exceptional efficiency, helping lower monthly energy bills.
We install indoor heads and outdoor units with proper line-set routing, mounting, and electrical setup.
Enjoy independent temperature settings for bedrooms, offices, additions, and more.
Serving Long Island since 1991 with proven reliability and technical expertise.
Upfront quotes, no hidden fees, and clear explanations for every service.
Electrical & Control System Inspection
Ensuring safe wiring, breaker sizing, and control communication.
Condensate Drain & Pump Inspection
Preventing water leaks with proper drain cleaning and pump checks.
Refrigerant Line & Pressure Testing
Checking for leaks, ensuring proper refrigerant charge, and confirming correct system pressures.
Coil Cleaning & Filter Review
Ensuring efficient heat transfer and clean airflow.
Indoor & Outdoor Unit Performance Testing
Reviewing blower operation, cooling output, compressor function, and airflow.
Long Island Code Compliance Review
Ensuring installations meet all local HVAC and electrical regulations.
Trusted Cooling Expertise for Long Island Homes & Businesses
Our Mini-Split Safety & Inspection Services Include:
To ensure reliable performance, NJM performs thorough inspections before and after servicing your ductless system.
Find Cooling 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.