MJD Systems LLC
Lancaster, PA 17603
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Our Story
MJD Systems was established to serve the Central Pennsylvania community with a high demand for commercial and new construction electrical, plumbing, and HVAC services - we have expanded to serving the East Coast. We offer the most comprehensive commercial electrical, plumbing, and HVAC service programs in the industry.
WHATEVER YOUR PROJECT, WE’RE HERE TO HELP. WHEN IT COMES TO OUR TEAM, NO JOB IS TOO BIG OR TOO COMPLICATED FOR US TO DO!
Our team of passionate and experienced technicians takes on every job, big or small. With over 120 years of combined industry experience, we are proud to offer our specialists’ skills at an affordable price.
Experts At Your Service - We offer dependable and trustworthy commercial services designed specifically businesses.
Commercial Experience
Apartments & Condominiums
Auto Dealership / Service
Bank
Church / Synagogue
Education (K-12)
Fitness Center
Grocery Stores
Hospital / Nursing Home
Hotel / Motel
House
Medical Office
Misc Project
Office Building
Residential Building
Restaurant
Retail Store
School / College / University
Single Family Residential
Regions & Counties Serviced
- Pennsylvania-Eastern
Maryland All
Pennsylvania All
Virginia All
Our CSI Codes
22 01 10 - Operation and Maintenance of Plumbing Piping and Pumps
22 01 30 - Operation and Maintenance of Plumbing Equipment
22 01 40 - Operation and Maintenance of Plumbing Fixtures
22 06 10 - Schedules for Plumbing Piping and Pumps
22 06 10.13 - Plumbing Pump Schedule
22 06 30.13 - Domestic Water Heater Schedule
22 10 00.00.01 - Plumbing Piping and Pumps
22 13 19.13 - Sanitary Drains
23 01 20 - Operation and Maintenance of HVAC Piping and Pumps
23 01 30 - Operation and Maintenance of HVAC Air Distribution
23 01 50 - Operation and Maintenance of Central Heating Equipment
23 01 60 - Operation and Maintenance of Central Cooling Equipment
23 01 70 - Operation and Maintenance of Central HVAC Equipment
23 01 80 - Operation and Maintenance of Decentralized HVAC Equipment
23 06 20 - Schedules for HVAC Piping and Pumps
23 06 30 - Schedules for HVAC Air Distribution
23 06 30.13 - HVAC Fan Schedule
23 06 30.16 - Air Terminal Unit Schedule
23 06 30.19 - Air Outlet and Inlet Schedule
23 06 50 - Schedules for Central Heating Equipment
23 06 50.13 - Heating Boiler Schedule
23 06 70 - Schedules for Central HVAC Equipment
23 06 70.13 - Indoor, Central-Station Air-Handling Unit Schedule
23 06 70.16 - Packaged Outdoor HVAC Equipment Schedule
23 06 80 - Schedules for Decentralized HVAC Equipment
23 06 80.13 - Decentralized Unitary HVAC Equipment Schedule
23 06 80.16 - Convection Heating and Cooling Unit Schedule
23 20 00.00.01 - HVAC Piping and Pumps
23 30 00.00.01 - HVAC Air Distribution
23 31 13.16 - Round and Flat-Oval Spiral Ducts
23 32 13 - Fabricated, Metal Air Plenums
23 32 36 - Air-Distribution Floor Plenums
23 32 39 - Air-Distribution Wall Plenums
23 32 43 - Air-Distribution Chases Formed by General Construction
23 34 13 - Axial HVAC Fans
23 34 16 - Centrifugal HVAC Fans
23 34 23 - HVAC Power Ventilators
23 35 16 - Engine Exhaust Systems
23 35 16.13 - Positive-Pressure Engine Exhaust Systems
23 35 16.16 - Mechanical Engine Exhaust Systems
23 37 16 - Fabric Air Distribution Devices
23 38 13 - Commercial-Kitchen Hoods
23 38 13.13 - Listed Commercial-Kitchen Hoods
23 38 13.16 - Standard Commercial-Kitchen Hoods
23 38 16 - Fume Hoods
23 41 43 - Ultra-Low Penetration Filtration
23 41 46 - Super Ultra-Low Penetration Filtration
23 43 13 - Washable Electronic Air Cleaners
23 43 16 - Agglomerator Electronic Air Cleaners
23 43 23 - Self-Contained Electronic Air Cleaners
23 51 13.13 - Draft-Induction Fans
23 51 43 - Flue-Gas Filtration Equipment
23 51 43.13 - Gaseous Filtration
25 05 26 - Grounding and Bonding for Integrated Automation
26 01 10 - Operation and Maintenance of Medium-Voltage Electrical Distribution
26 01 20 - Operation and Maintenance of Low-Voltage Electrical Distribution
26 06 10 - Schedules for Medium-Voltage Electrical Distribution
26 06 20 - Schedules for Low-Voltage Electrical Distribution
26 06 20.26 - Wiring Device Schedule
26 10 00.00.01 - Medium-Voltage Electrical Distribution
26 18 13 - Medium-Voltage Cutouts
26 20 00.00.01 - Low-Voltage Electrical Distribution
26 21 00.00.01 - Low-Voltage Overhead Electrical Power Systems
26 43 13 - Transient-Voltage Suppression for Low-Voltage Electrical Power Circuits
27 05 26 - Grounding and Bonding for Communications Systems
33 71 36 - Extra-High-Voltage Wiring
33 71 36.13 - Overhead Extra-High-Voltage Wiring
33 71 39 - High-Voltage Wiring
33 71 39.13 - Overhead High-Voltage Wiring
33 71 49 - Medium-Voltage Wiring
33 71 49.13 - Overhead Medium-Voltage Wiring
33 81 23 - Aerial Cable Installation Hardware
33 81 33 - Communications Blowers, Fans, and Ventilation
34 21 16 - Traction Power Substations
34 21 16.13 - AC Traction Power Substations
34 21 16.16 - DC Traction Power Substations
40 95 73 - Process Control Wiring
43 11 13 - Gas Handling Fans
43 11 13.13 - Axial Gas Handling Fans
43 11 13.16 - Centrifugal Gas Handling Fans
43 11 23 - Gas Handling Blowers
