The University of Toronto Mississauga Campus has completed construction of a new Science Building, a state-of-the-art facility designed to enhance research, teaching, and innovation. The building consists of a basement (Level 0), four floors above grade (Levels 1–4), and a mechanical penthouse (Level 5), with a total gross floor area of 13,769 square metres. It connects seamlessly to the existing William Davis Building and houses a wide range of specialized spaces, including science laboratories, an animal care facility with holding and procedure rooms, imaging rooms, central chemical and solvent storage, animal cage wash areas, instrument rooms, offices, science classrooms, high-performance computing rooms, telecommunication spaces, kitchens, and washrooms. Kelson supplied and installed comprehensive, self-contained mechanical systems to support the building’s operations. The mechanical layout includes two main mechanical rooms, a chiller and domestic water room located in the basement, and a mechanical penthouse on Level 5. The primary mechanical systems consist of chilled and heating water systems, a steam system with two steam boilers (each 3,347 MBH) and three heating boilers (each 3,842 MBH), two 200-ton water-cooled chillers, one 100-ton heat recovery chiller, a deaerator, and three cooling towers (1,347 GPM). Additional systems include sand filtration, air handling, laboratory exhaust, domestic hot and cold water, a rainwater harvesting system with cistern filtration and storage, a building management system, and a geothermal field water loop. The geothermal system features 100 vertical boreholes beneath the building, providing sustainable heating and cooling by supplying energy to the heat recovery chiller as a first-stage source before engaging the boilers and chillers. This system significantly improves energy efficiency by providing “free” heating and cooling whenever possible. The project also includes two new natural gas generators supplied under Division 16. Designed to achieve LEED v4 Building Design and Construction (BD+C) Silver Certification, the Science Building incorporates a green roof and other sustainable design elements. For the heating system, Kelson installed Uponor pre-insulated piping for underground heating water distribution, used to supply radiators and other terminal units throughout the facility.