I'm not quite sure what you mean - surely what matters is the difference between the actual ambient temp and the desired brew temp at any given time, rather than an average??
All fridges are insulated so it you keep the fridge door closed the temperature inside the fridge will level out at more or less the "average" temperature of the day, week, month etc.
On the 6th August I started a Dark European Lager - Munich Dunkel and these are my Diary Notes:
At that stage, as the evening was approaching and the temperature was due to fall, I switched off the "refrigerate" function, changed the Set Point to 20*C and just left the "Heat" function on with the heater turned down to just above "minimum".
- Ambient temperature at 29*C and tap water at 22*C!
- Put FV in Brew Fridge No.1 with Set Point at 19*C.
- Probe showed 22*C after two hours.
It has fermented at between 19.8*C and 20.3*C since that time; and yesterday's ambient in the garage was up to 24*C.
If your Brew Fridge is cycling between "Refrigerate" and "Heat" it's quite possible that the controller just isn't set up properly; ditto if the "Refrigerate" only is switching on and off.
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