Trefz services commercial MEP systems via two platforms:

• Existing customers with service contracts

• New customers on an as-needed basis

Licensed Insured BondedSupport 24/7

Contracts are fully customizable depending on customer needs, and range from basic filter replacement to full service including O&M procedures and parts coverage. Our comprehensive support covers the full realm of MEP equipment:

  • Pump alignments and service
  • Variable frequency drive startups and programming
  • Small and large split systems
  • Heat pumps
  • Cooling towers
  • Packaged rooftops and air handlers
  • High-efficiency, cast iron and steam boiler systems
  • High-efficiency and standard water heaters
  • Packaged domestic booster systems and controls
  • Electrical systems
  • Emergency power, energy and generation
  • VRF systems

Controls Platform

We utilize the Johnson Controls Niagra AX™ framework and BACnet data communication protocol for commercial and industrial mechanical systems.

Factory-Authorized Technicians

TMI technicians are factory-trained on leading manufacturer systems including:

  • Armstrong pumps, drives, packaged booster systems
  • Patterson-Kelley (PK), Laars and Weil McLain boilers and water heaters (including high-efficiency condensing, cast iron, steam and water boilers)
  • Emerson VFD motor controllers
  • Danfoss VFD motor controllers


Need help? Call us today 215-442-0969

Serving the Tri-State area – PA, NJ, DE


“Our experiences working with Trefz Mechanical on two major Lower Merion Township library renovations were very positive ones. The projects included new boilers, distribution piping throughout, blower coils, Runtal baseboard, ductwork and diffusers. All work was done professionally, efficiently and on schedule. We look forward to working with Trefz again down the road.”

- Mark E. Johannesen

AIA, LEED AP BD + C, ITETTA Architects and Engineers