Practical Tools. Real Engineering.
Our journey is guided by the presence, guidance, encouragement, motivation, and prayers of our beloved father, Late Muhammad Saleem Arain (Rest in Peace). His values of honesty, dedication, and hard work inspire everything we do. We carry his legacy forward with pride and purpose.
ColdMatrix is a digital tools platform that provides free, practical online calculators and engineering utilities for engineers, contractors, builders, business owners, technicians, and general users. Our tools simplify calculations for cold storage, sandwich panels, prefab construction, steel structures, material estimation, and everyday business needs.
But ColdMatrix is more than just a calculator website. It is directly connected to Cold Matrix Advanced Solutions — our professional engineering and construction business. This connection ensures every tool we build is rooted in real‑world project experience, not just theory.
Cold Matrix Advanced Solutions is a division of Saleem & Sons Enterprises, guided by the legacy of our late father, Muhammad Saleem Arain (Rest in Peace), whose hard work and vision continue to inspire everything we do.
Cold Matrix Advanced Solutions is our professional engineering and construction business. We specialise in:
We work with reliable international brands for compressors and refrigeration equipment, including Bitzer (Germany), Copeland, Frascold, and Gianni condensing units, evaporators, and accessories.
Our work covers the full spectrum of insulated and industrial construction:
"To deliver uncompromising quality and reliable construction in cold storage, prefab buildings, and sandwich panel solutions — and to empower the industry with free, experience‑based engineering tools."
ColdMatrix Tools was not built by theorists. It was built by a cold‑storage contractor with over 10 years of hands‑on work. Every calculator, every recommendation, comes from real projects, real measurements, and real mistakes corrected over a decade in the field.
We focus on practical calculations, reliable materials, professional installation, and project‑oriented solutions.
Our services and tools are built for:
We serve clients in Karachi, Lahore, Islamabad, and across Pakistan, as well as the UAE.
We now manufacture import‑quality PU/PIR sandwich panels right here in Karachi, in collaboration with a trusted international partner. These panels meet the same standards we once imported from Dubai (Kingspan, TSSC, and Emirates Industrial Panels) — but produced locally to serve you faster and more affordably.
With 10+ years of practical, on‑site cold storage experience, we have worked directly with world‑leading brands – Bitzer (Germany), Copeland, Frascold, and reliable Gianni condensing units, evaporators, and accessories. Before local manufacturing, we spent three years importing premium panels, which gave us deep knowledge of international quality and thermal performance.
We serve clients in Karachi, Lahore, Islamabad, and all across Pakistan, as well as the UAE.
Whether you need a cold store, sandwich panels, prefab building, or just a free calculator — we're here to help.
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