Due to the hot Texas weather that lingers on (sometimes popping up even in the dead of winter) I have certain things that I use to trigger fallish feelings around my house...
using the teakettle for the first time.
homemade gingersnaps and assorted pumpkin goodies.
pulling out the extra blankets and strategically placing them hopefully around the house.
Ah, and to wear a jacket outside instead of to ward off indoor air conditioning freeze at public buildings - that is a sure sign of fall for me!