
Installation
Full installation of the ground loop, heat pump and distribution, with permits pulled and inspections attended.
Geothermal heating installed and serviced for Long Island homes — efficient, quiet heat drawn from the ground rather than burned. Licensed and insured across Nassau and Suffolk County.
22+ YEARS ON LONG ISLANDLICENSED & INSURED · NASSAU & SUFFOLK
PLUMBING · HEATING · COOLING · CONTRACTING
Have An Emergency? We’re Available 24/7.
631-587-0085WE ANSWER EVERY CALLGeothermal does not burn anything. It moves heat between your house and the ground, which stays at a steady temperature year-round a few feet down regardless of what the weather is doing above it. In winter it draws heat from the ground into the house; in summer it runs the other way and takes heat out. One system, both jobs, no combustion in the building.
It is the largest up-front investment in heating we install, and the lowest running cost. That trade is the whole decision, and it depends on your property — whether there is room for the loop field, what the ground conditions are, and how long you plan to be in the house. NJM installs and services geothermal across Nassau and Suffolk County, and we will tell you plainly if your lot is not suited.
Master PlumberLicensed to pull permits
TASK 86/87Certified for gas work
Navien NSSFactory-trained on tankless22+ years on Long Island · Plumbing, heating, cooling, gas and contracting under one roof

Full installation of the ground loop, heat pump and distribution, with permits pulled and inspections attended.

The same equipment handles both seasons, which removes a separate air conditioning system from the equation.

Geothermal pairs particularly well with radiant floor heating, which runs at lower water temperatures. We install both.

Maintenance and repair of existing geothermal systems, including ones we did not install.

Where the design calls for it, integrated properly rather than bolted on.
Sizing the system and the loop field to the house and the property, rather than to a rule of thumb.
An honest look at whether your lot suits horizontal or vertical loops — or neither. We will say so if it is the last one.
If geothermal is not right for your property we install boilers, furnaces, radiant and heat pumps — so there is a good answer either way.
We don’t charge to quote a job. We do charge to find a problem nobody has identified yet. Which one you need — and what it costs — gets agreed on the phone, so nothing about the cost is a surprise on the doorstep.
You get the number on the phone, before anyone is dispatched, and it is what you are charged when the technician arrives. One rate across all four trades — plumbing, heating, cooling and gas.
A licensed, insured technician carrying the certifications the work needs, and the time to find what has actually failed — not a quick look and a guess.
A call-out advertised at almost nothing gets recovered once someone is standing in your basement. Get the number before anyone travels — from us, or from anyone else you call — and hold them to it when they arrive.
A boiler that fails in January is not a purchase anyone planned. Financing is available on the big-ticket work, so a system replacement does not have to come out of savings in one go.
Boiler, furnace and water heater replacement, a full air conditioning system, a whole-house repipe, sewer and water main work, and larger contracting jobs — kitchens, bathrooms, dormers and extensions.
At the estimate, before anything is scheduled. It is worth asking even if you think you will not need it, because knowing it is there changes what you are willing to consider fixing properly.
The price of the job. The quote is the quote whether you finance it or not — and on a straightforward repair it is usually not worth the paperwork. We will tell you which one you are looking at.
The case for it is straightforward: no combustion, no flue, no fuel deliveries, very low running costs, and one system that heats and cools. Equipment sited indoors is not exposed to the weather, and ground loops are long-lived. For a house you intend to stay in, the running-cost saving accumulates for decades.
The case against is equally straightforward. It costs considerably more up front than a boiler or furnace, and installation is disruptive because the loop field has to go in the ground — either horizontally, which needs land, or vertically, which needs drilling. On a tight lot, or if you are likely to move within a few years, a high-efficiency conventional system is usually the better financial answer. We install those too, so we have no reason to push you either way.
One licensed team, one number to call, across Nassau and Suffolk County.
What it says on the coupon is what comes off the bill. Mention it when you call.
Replacing a system before the cold sets in, sized from a load calculation rather than from whatever was there before.
Code NJM-HEAT200Expires October 31, 2026See the details →$50 OffNo heat, not enough heat, or heat in only half the house.
Code NJM-HEATREP50Expires October 31, 2026See the details →Maintenance PlansBoilers and furnaces mostly fail in January, and mostly after a year nobody looked at them. Preset or custom plans, for homes and for commercial buildings.
Code NJM-HEATPLANNo expiryAsk us →A few feet underground, the temperature stays fairly constant all year regardless of the weather above. Geothermal circulates fluid through buried loops to exchange heat with that ground — pulling heat out of it in winter to warm the house, and pushing heat into it in summer to cool the house. It moves heat rather than creating it, which is why running costs are low and nothing is burned indoors.
Yes, and that is a significant part of the value. One system does both, which means no separate air conditioning to buy, install or maintain.
It depends on which loop type suits the site. Horizontal loops are buried across an area of land and need room. Vertical loops are drilled and take far less surface area but cost more to install. On a tight Long Island lot vertical is often the only option, and sometimes neither is practical — we will tell you after looking rather than after starting.
It depends on how long you are staying. It is the highest up-front cost of anything we install and the lowest to run, so the saving accumulates over years. In a house you intend to keep, that is a strong case. If you may move within a few years, a high-efficiency conventional system is usually the better financial decision — and we install those too, so we have no stake in pushing you one way.
More disruptive than a boiler replacement, because the loop field goes into the ground. Horizontal loops involve excavation across an area of the property; vertical loops involve drilling. We will explain exactly what happens on your lot before you commit.
The indoor equipment has a service life comparable to other heating equipment, while the buried ground loops are long-lived — they sit undisturbed underground and have no moving parts. That imbalance is part of why the long-term economics work.
Yes, and they pair unusually well. Radiant floors run at lower water temperatures than radiators, which is exactly the condition a heat pump is most efficient in. We install both, so it can be designed as one system rather than two that have to be made to cooperate.
Yes. Given the up-front cost relative to conventional heating, financing is often what makes geothermal viable. We finance through Synchrony, subject to credit approval. Ask when you call and we will go through the options.
Based in North Babylon, working across both counties — close enough to get there fast, local enough to know the housing stock and the permit offices.
Proudly serving all of Nassau and Suffolk County, with deep local roots near our North Babylon home base.
Get A Free Estimate5 out of 5 stars
NJM Mechanical Inc are awesome!!!!! Just Had a maintenance call / yearly service. Always professional prompt service. I had Neil as my service tech - great job.

5 out of 5 stars
Couldn't be happier with NJM Mechanical and Neil. I needed a new Navien wall mounted gas combination boiler. He showed up on Friday afternoon to diagnose and was at my house at 7am the very next morning on a Saturday throwing in my new Boiler. They didn't charge Emergency Service rates and they beat their competitors price by over $500!

5 out of 5 stars
Neil and his team showed up in an emergency situation where I had no heat because my furnace died. His professionalism and ability to diagnose the problem was incredible. My mom is 87 years old and he made her comfortable with his kindness. Thanks for warming our home, and our lives Neil. God bless you and your team!!


Free estimates with no obligation, 24/7 emergency response, and 22+ years serving homes and businesses across Nassau and Suffolk County.