TEV Limited is a UK-based designer and manufacturer of cooling, heating, and refrigeration equipment, operating through two renowned brands: Marstair and Quartz. Marstair specialises in air conditioning and refrigeration solutions for sectors such as retail, leisure, and food manufacturing, while Quartz focuses on chilled water-cooling solutions for commercial, residential, and public sector applications. With a commitment to energy efficiency and environmental sustainability, TEV manufactures its products at its facility in West Yorkshire.