I don't have a fermentation fridge so I have to put my fermenter in the best spot to get the correct temperature; and keep an eye on it and move it or heat/cool it if necessary. My last brew I used Safale US-05 and I was aiming for a starting temperature of 16°C letting it rise to around 22°C after 3 days and holding it around 20/22 °C to the end, which I understand is a good profile for the yeast.
However to cut a long story short and my "cold" room was too cold and my "warm" room was too warm and the beer ended up sort of swinging from 12°C to 22°C a number of times, but this is still within the Fermentis recommendations, in fact it was mostly between 15 and 22 which is what they say it should be ideally.
FERMENTATION TEMPERATURE: 12-25°C (53.6-77°F) ideally 15-22°C (59-71.6°F)
My question is does it have to be a consistent temperature as well as being between 12°C and 22°C ... and if it does what negative effects would a fluctuation in temperature cause?
I think there were probably 3-5 signifignant cyles of 12/15 °C to 20/22 °C and back again
EDIT it just occurred to mention my gravity readings, which surprised me a bit but not sure. The fermentation went from 1058 to 1012 in 5 days