Craft Brewery Cooling System Guide: What You Actually Need August 4, 2026 Getting cooling right is one of the most consequential infrastructure decisions a brewery makes. Temperature control affects fermentation quality, product consistency, energy costs, and your ability to scale production — and the system that works for a 5-barrel operation may be completely wrong for a 30-barrel one. This guide walks through what a brewery cooling system actually needs to do, and how to choose the equipment that matches your operation. What a Brewery Cooling System Must Do Unlike commercial HVAC, brewery cooling has to manage multiple precise temperature zones simultaneously: Glycol chilling for fermenters: most lagers ferment between 45-55 degrees F; ales between 60-72 degrees F. Temperature swings of more than a degree or two during active fermentation affect yeast performance and flavor development. Cold conditioning: lagering and conditioning require temperatures at or near 32 degrees F for weeks or months. This is a significant, sustained load that must run reliably. Brite tank temperature: finished beer held in brite tanks must be kept cold (typically 30-34 degrees F) to maintain carbonation and stability. Cellar ambient control: the production floor benefits from cooler ambient temperatures to reduce heat load on tanks and support worker comfort during long brew days. "Every brewery is different, but the requirements are the same — stable temperatures under variable load, with zero tolerance for fermentation disruptions. The equipment has to keep up, not just most of the time, but all of the time."— Andy Backer, VP of North American Sales, G&D Chillers Glycol vs. Direct Expansion vs. Chilled Water System Type Best For Key Consideration Glycol chiller (most common) Breweries of any size using jacketed fermenters Glycol concentration must be maintained; piping layout affects efficiency Direct expansion (DX) Smaller operations or supplemental cooling Limited to simpler configurations; harder to retrofit as you grow Chilled water with heat exchanger Large breweries with multiple load types Most flexible for complex, multi-zone operations; higher first cost Sizing Your Chiller Chiller sizing for a craft brewery is more complex than simple square footage calculations. Key variables: Total tank volume and typical batch schedule: how many tanks are active at once, and what temperatures are they maintaining? Peak simultaneous load: the worst-case scenario where multiple batches are at high-activity fermentation stages simultaneously Ambient temperature in the mechanical space: air-cooled chillers work harder in warm environments; size for your hottest summer conditions Future expansion: size at least 20-25% above current needs if expansion is anticipated within 3-5 years A common undersizing error: calculating only active fermentation load and forgetting cold conditioning tanks. Lagering tanks at 32 degrees F represent a constant, substantial load that runs even when no active fermentation is happening. Redundancy Considerations Production breweries should treat their chiller like mission-critical infrastructure. A chiller failure during active fermentation can ruin thousands of dollars of product and disrupt delivery schedules. Options: Single chiller with rental backup plan: appropriate for very small operations Dual chiller with shared glycol loop: either chiller can handle the load alone; one can be serviced without production impact Oversized single chiller with documented emergency procedures: lower cost but higher risk Frequently Asked Questions What size chiller does a 10-barrel brewery typically need? A rough starting point is 1-2 tons per barrel of active fermentation and conditioning capacity. A 10-barrel brewery with 4-5 tanks typically needs 15-25 tons of chiller capacity, but this varies significantly with your batch schedule and glycol temperatures. Always validate with a load calculation. How cold should my glycol be? Most breweries run glycol at 26-28 degrees F for tanks that need to hit 32 degrees F, allowing for temperature rise through the glycol loop. For higher-temperature fermentation, the glycol setpoint can be raised to improve chiller efficiency. > Talk with G&D's team about sizing a chiller for your brewery -> Contact us