The Castle Difference

Castle takes pride in the quality of our workmanship and the satisfaction of our customers.  We pledge the resources needed to ensure every contract is implemented in a timely, professional, and competent manner.

Castle combines old-fashioned integrity with the latest in mechanical know how.  We are a State-of- the-Art mechanical contractor providing commercial HVAC systems in a wide range of environments.  Below are some of our current and completed projects.

Featured Projects

Castle installs a wide range of projects ranging from routine rooftop unit replacements to highly complex custom solutions implemented in a tight time-frame.

Foundation Software – Strongsville, Ohio

Click below for project details and video

KeyBank Operations – Brooklyn, Ohio

Click below for project details and photos

Client List by Business Sector



  • Case Western Reserve University
  • Cleveland State University
  • Cuyahoga Community College
  • Ohio State University
  • Baldwin Wallace University
  • Kent State University
  • John Carroll University
  • William Rainey Harper Elementary School
  • Waverly PK-8 School
  • Riverside Elementary School (Madison and Concord)
  • Boys Hope Girls Hope New Academy Center (Cleveland)
  • Euclid High School and Middle School
  • Sunbeam PK-8 School
  • Saint Edward High School
  • Metro Health
  • Cleveland Clinic Foundation
  • University Hospital
  • Hillcrest Hospital
  • Summa Health
  • Lutheran Hospital
  • Fairview Hospital
  • Medina Hospital
  • Marymount Hospital
  • Saint Vincent Charity Medical Center

Arts & Recreation

  • Lifetime Fitness
  • Horseshoe Casino
  • The Gund Arena
  • Quicken Loans Arena
  • Rocket Mortgage Fieldhouse
  • Cleveland Zoo
  • The Rock and Roll Hall of Fame
  • Thistledown
  • Progressive Field
  • Golftec


  •  Painesville Post Office
  •  Ohio Division of Watercraft
  •  Cleveland Public Library
  •  Cleveland Metroparks
  •  Strongsville City Hall
  •  Strongsville
  •  Water Plant
  •  Olmsted Falls Library
  •  Cuyahoga County Crime Lab
  •  Lorain Jail
  •  Bay Village Police Station
  •  North Olmsted Police Station
  •  Bainbridge Police Station


  • Oracle
  • Westlake Orthopedic
  • PNC Bank
  • Flats East Bank
  • Ohio Catholic Credit Union
  • Stantec


  • Nova Chemical
  • Energizer
  • Goodyear
  • Verizon
  • AT & T
  • Dominion
  • Mars Electric



  • Marriott
  • Hyatt

House of Worship

  • St. Paul’s Episcopal Church
  • St. Basil’s Church

Restaurants & Retail

  • Clair’s
  • Malley’s
  • Starbucks
  • Dick’s Sporting Goods


  • The Standard Building
  • Statler Arms
  • Fenway Manor


United States Armed Forces

  • U.S. Coast Guard
  • Ohio National Guard

Senior Living

  • Geauga Senior Living
  • Normandy Assisted Living