September is showing lots of wonderful degrees in the eastern part of USA (from the HOT 80's or 90's to cold cold cold 30's.)
In my honest opinion for my (smarter living), don't touch that heater yet. Better yet, grab & bring out some blankets (cold?) add a extra layer of blanket before touching the heater.
(keep some $$$$ in your pocket.)
Wear socks, maybe a long sleeve shirt & pj pants to bed to stay extra warm.
(kinda off topic, people in my city whine tht they're "bills are high" but when it's chilly out side they don't think "layer up" (save $$$$ in the pocket) no they think & show "ROAR UP THE HEATERS YA'll!" & lose $$$$ than whine they can't pay they're lights/gas bill.) *frown*
So my honest opinion, layer up, bundle up. Save the $$$$ in your pockets!