Cellar Cooling Running Too Warm
Cellar cooling systems are often out of sight and easy to overlook until a delivery of beer starts throwing up complaints about condition. Unlike an obvious total breakdown, a cellar that's simply running warmer than its set point tends to develop gradually, which makes it easy to miss until quality is already affected.
Because cellar cooling directly affects product quality and, in busy pubs, has real trading consequences if it fails on a Friday night, it's worth understanding the common causes so problems can be caught early.
What typically causes a warm cellar
- Split unit or ducted cellar cooler struggling due to a dirty condenser or evaporator coil
- Cellar door or hatch left open, or poor door seals allowing warm cellar-adjacent air in
- Refrigerant leak reducing cooling capacity gradually over time
- Thermostat or sensor reading incorrectly, meaning the system thinks the cellar is colder than it actually is
- System undersized for the cellar's actual heat load, particularly after cellar layout changes or added equipment
What cellar staff can check
Check the condenser unit, wherever it's located, for dust and debris restricting airflow, and confirm any cellar door, hatch, or delivery drop doesn't have a gap letting warm air in. Take a manual thermometer reading at cask or keg level rather than relying solely on the wall thermostat display, since sensor position and calibration drift are both common issues.
Why beer quality makes this time-sensitive
Cask ale in particular is sensitive to temperature, and a cellar running even a few degrees above ideal can accelerate conditioning, shorten shelf life, and affect taste, which has a direct trading and reputation impact. This is a case where getting an engineer out at the first sign of drift is more cost-effective than waiting until it's an obvious full failure.
What we assess on a visit
We check the cooling unit's coil condition, refrigerant charge, and thermostat calibration against an independent temperature reading taken at cask level, since discrepancies here are a common and easily missed cause. We'll also look at the cellar's insulation and door seals if the system appears to be working correctly but still can't keep up.
Keeping cellar temperature consistent
- Keep the condenser coil clean and well-ventilated, particularly if located in a hot plant area
- Check door and hatch seals regularly, especially after deliveries
- Book scheduled servicing ahead of summer trading, when cellar cooling systems work hardest
FAQs
Common questions
How much warmer than ideal is a genuine problem?
Even a couple of degrees above the recommended range can noticeably affect cask ale condition, so it's worth acting on drift rather than waiting for a larger failure.
Can this be fixed without disrupting trading hours?
In most cases yes, and we can discuss timing that minimises disruption, particularly for busy pubs and bars.
Do you offer maintenance contracts for pub cellar cooling?
Yes, scheduled servicing is available and is generally the most reliable way to avoid mid-service breakdowns.
Could this be a thermostat problem rather than the cooling unit itself?
Yes, sensor drift or poor sensor placement is a genuinely common cause and one of the first things we check.
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