........you can breed corns (and alot of other stuff) without doing anything........your room /cages should get a little but cooler anyways...even with heated room and heat tape even.......
so..IF you are asking can you brumate with just a little drop in temps?.yes and no....
to brumate you stop feeding for like 3 weeks then drop the temps from 80 to the 60's then even all the way down to 55 degrees F.......you can drop from 82 to 77 let's say and still feed and all just smaller meals like once a week......BUT IF you plan on stopping food and letting them go 3 months without food...you NEED to get the temps down to REAL brumation conditions.....IF a snake is not fed and is left at like 70 degrees it will not only want to eat and lose weight...the liver will change and cause problems.........(I have no scientific explaination but something changes if you starve)......
real brumations should be cold enough that a snake really won't lose any weight at all.........55 degrees is good temp
so if you cannot get cold enough just drop 5 degrees and still feed ....light cycles will change or be changed too then....
..have fun
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..................gottaLuvIt!!