
Watsco, Inc.

Watsco (NYSE: WSO) is the largest distributor of HVAC/R products in the Americas — a Fortune 500 company with a network of business units spanning the continent. ONMARS has worked with Watsco to modernize their e-commerce infrastructure, migrating legacy systems to Adobe Commerce and building custom tools that serve over 375,000 contractors and technicians.
We've built and maintained e-commerce platforms across several of Watsco's primary business units, ensuring consistency and shared infrastructure where it makes sense while respecting the operational differences between regions.


The core project was migrating Watsco's e-commerce infrastructure from legacy systems to Adobe Commerce (Magento 2) across 17 independent business units. Each unit has its own catalog, pricing rules, and regional logistics — so this wasn't a single migration, it was seventeen, coordinated to maintain uptime for hundreds of thousands of active users.
Beyond the storefront, we built a custom Distributor-Managed Inventory (DMI) system that gives contractors direct control over their stock levels. The system tracks consumption patterns, flags low inventory, and supports automated reordering — turning Watsco from a supplier into an integrated part of the contractor's supply chain.