Can I proof sourdough and maintain starter at 21C room temperature?
Yes, 21C is a comfortable, practical temperature for both. It sits right in the normal room-temperature range the book works with (around 20 to 22C), where a bulk ferment lands near 8 to 12 hours. At that temperature use roughly 10 to 15% starter and judge by size, and a starter kept there just needs a daily feed while it is active.
Answered by Hendrik, The Bread Code
From the book
As explained earlier the key to making great bread is a slow but not too slow fermentation. Enzymes require time to break down your dough. Taking all this into consideration, I try to aim for a fermentation time of around 8 to 12 hours. This seems to be the sweet spot for most of the flours that I have worked with. To achieve this, I use around 5 % of sourdough starter in summer times (temperatures around 25 °C (77 °F) in the kitchen). In winter times I opt for around 10 % up to 20 % sourdough starter (kitchen temperature around 20 °C (68 °F)). This allows me to use a sourdough starter that’s not in perfect condition. As explained earlier, your bread dough is essentially a gigantic starter. The low inoculation rate allows the starter to regrow inside your main dough into a desirable balance. Furthermore, the enzymes have enough time to break down the flour. This also allows me to skip the so-called autolysis step completely (more in the next section). This greatly simplifies the whole process.
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