An Indoor Walk-In Cooler Conveniently Accommodates Large Volumes of Product in Your Business! Walk-in coolers and freezers (walk-ins) are large, insulated refrigerated spaces with access door(s) large enough for people to enter. Walk-ins are used to temporarily store refrigerated or frozen food or other perishable items. The equipment is composed of an envelope (panels and doors) and a refrigeration system. Any more question or interested in learning more? Our experts here at ProTech are more than glad to help. Remember, like always we are here 24/7 to assist you with any of your refrigeration, air conditioning and HVAC needs.