thanks OFL. my heater heats pretty slow. this morning about 8:30 when I noticed it was below 60, I plugged the heater in, and now, at 11:00am, it's still only at 64. So, it's gradual.
Also, speaking of decaying plant matter...I had wondered why my banana plants, that had been doing so well, started turning yellow over the last couple days. =( i guess they don't like temp. changes either.