thanks.. our dew point round here won't go below about 15C at the moment, UK is notoriously damp.. not always raining.. but rarely below 50% RH, often over 80%, right now it's 19C and 75% RH, not sure what cooling we'd get from evaporative.. judging with how wet I get on runs, not that much!Don't forget about evaporative cooling. It's easy enough to play with & try out using clay pots.
EDIT, found a calculator, put our weather conditions in and 2~3C temperature reduction. supply air | drop temperature calculator - Evaporative Cooling Calculations ToolKit but at least I have an idea now.. It might have worked!
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