Maine Homebrewer
Grandmaster Brewer
Fermenting beer is at a higher temp than ambient. Ive seen 10F more.
Wow! I generally expect 2F above ambient, and the most I've seen was 4F. That's comparing a fermometer stuck to a glass carboy with another fermometer stuck to another glass carboy, one being in full fermentation while the neighbor is a clear secondary.
I have little control over my fermentation temperature other than heating the basement in the winter. That's when I do lagers by holding ambient in the low 50s. Spring and fall I do a string of ales, and summer is too warm to brew.
My last ale of the season is ready to rack. That's five kegs for the summer. That should get me through.