Source published 2026-10-22
HVAC School’s October 22 discussion with Max Johnson explores grocery refrigeration using a secondary water-and-propylene-glycol loop. Instead of circulating refrigerant throughout the sales floor, the loop carries cooling from a central heat exchanger. The episode discusses staging retrofits while a store remains open. But this is not a promise of automatic energy savings: extra heat exchange and pumping introduce costs and design tradeoffs. For crews and store operators, the interesting question is how to manage the changeover without losing sight of reliability.
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