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Bank of VRF condensing units on a school roof in Queens
Capabilities

What we can build, and what we can keep running.

Design, equipment supply, installation, maintenance and service — for all applications, residential through industrial.

Systems

Systems we work on.

These are the applications we specialize in — though the list is not a boundary. If it heats, cools, ventilates or refrigerates a building, we can quote it.

Mini-Split heat pump — ductless and ducted

Single-zone and multi-zone systems, wall-mounted and concealed ducted indoor units. Heating and cooling from one system.

VRF heat pump heating and cooling systems

Variable refrigerant flow for buildings with shifting loads — simultaneous heating and cooling, zone-level capacity control.

Solar heat pump heating and cooling systems

Heat pump systems integrated with solar, for owners pursuing lower operating cost and electrification.

Central ducted supply/return, exhaust and fresh air

Full air-side distribution including supply and return ductwork, exhaust systems and outside-air ventilation.

Refrigeration for the food industry and grocery stores

Walk-in coolers and freezers, cold storage, display and process refrigeration for supermarkets and restaurants.

Water heating and cooling systems

Hydronic systems for residential, commercial and institutional buildings — boilers, chillers, pumps, piping and controls.

Industrial refrigeration, cooling and heating

Room comfort and process-area conditioning for industrial facilities, including infrared gas heating for high-ceiling space.

Capability

Chillers.

Water-cooled and air-cooled chillers for commercial and institutional buildings — installation, seasonal start-up, and the annual service that keeps a plant at design capacity instead of quietly losing it a few points at a time.

Commercial chiller plant room in New York City serviced by JJR Mechanical
  • Tube cleaning

    Condenser and evaporator heads pulled, tubes brushed and flushed, end covers re-gasketed and pressure-checked before the plant goes back on line.

  • Refrigerant management

    Purge unit service, leak checks and charge verification — with recovery and record-keeping handled to EPA requirements.

  • Controls and safeties

    Control panel checks, sensor calibration, and verification of staging, interlocks and safety shutdowns against the design sequence.

  • Chilled water side

    Pumps, valves, strainers, chilled water supply and return piping, and insulation repair — the half of a chiller plant that usually gets ignored.

Capability

Boilers.

Firetube and cast-iron boilers for building heat and process steam. Most of the work happens in the off-season: open it up, clean it properly, prove the safeties, and it will carry a New York winter without an emergency call.

Firetube boiler in a New York City commercial boiler room serviced by JJR Mechanical
  • Annual teardown and inspection

    Rear and front doors pulled, tube sheets, refractory and gaskets inspected and replaced — and documented for the insurance inspector.

  • Fireside cleaning

    Tubes brushed and vacuumed, turbulators and burner throat cleared. Soot is insulation in the wrong place — it costs fuel every hour the boiler runs.

  • Burner and combustion

    Flame safeguard, linkage and ignition serviced, then combustion analysed and the burner tuned for clean, efficient fire across the firing range.

  • Water side and controls

    Low-water cutoffs, level and pressure controls, feedwater, blowdown and relief valves tested — the devices that decide whether a fault stays a fault.

Scope

Six stages, one contractor.

We handle the full lifecycle rather than one slice of it. That means the engineer who sized the system, the crew who installed it and the technician who services it all work for the same company.

  • System design

    Load calculations, equipment selection and layout by professional engineers on staff. We also bid on plans and specifications for design firms.

  • Equipment supply

    We supply the equipment we install, across all six major brands — so specification, procurement and warranty sit with one contractor.

  • Installation

    New construction, remodeling, retrofits and additions. Refrigerant piping brazed, pressure-tested, evacuated and charged to manufacturer specification.

  • Commissioning

    Charge, airflow, control sequences and safeties verified and documented before handover.

  • Maintenance

    Scheduled service programs that hold rated capacity, extend equipment life and lower operating cost.

  • Service

    Same-day emergency response, diagnostics and repair by factory-trained and certified technicians.

Bank of VRF condensing units installed on a school roof in Jamaica, Queens by JJR Mechanical
Equipment

Brands we install and service.

Mitsubishi Electric, Daikin, Carrier, York, Fujitsu and YMGI — plus most other major manufacturers.

Mitsubishi Electric, YMGI, York, Daikin, Carrier and Fujitsu — HVAC brands installed and serviced by JJR Mechanical
Start your project

Tell us what your building needs.

Send drawings, a photo of your existing equipment, or just a description of the problem. We will get back to you with a clear scope and a written estimate.