Diane,

Actually, in the late fall and winter months, when the plants need it the
most, we do get a good diurnal range. The Phals love it. As for the
occasional frost (never really a freeze around here), it's rare, but did
happen last winter. Hoping for better this time. My back can't take moving
all those plants around (I have a Den. discolor that's taller than my
husband, and he's 6'3", so you can imagine what it weighs), and you're right
about the dining room table. And the floor. And the coffee table in the
living room. And around the roman tub in the master bath. And under the
windows in the family room. Etc!

All of which is why we're looking at a way to provide some warmth outside
this year, if we need to. Probably a combination of water and light or
propane heater.

Diana