Seems to me that you want your temps a little more steady.
I've seriously thought about this. For most of the year the temps are very steady. Being in Florida the AC runs almost constantly, which keeps the apartment at the same temp. It's only in the winter that things change, and even then it isn't much. I've only been here a couple of years, and the first winter the apartment temps dropped for just a month or so right in the coldest part of January. This year its been a bit colder than normal according to the local weather guy. Yesterday it was something like 20F cooler than normal, which means we had the heat on instead of the AC, which seems weird for April.

I guess my point is that since this year the temperature was not as steady as last years, I may reconsider buying a thermostat. I thought it would not be necessary, but the unpredictability of mother nature (and you) tell me that perhaps it is.

Thanks for the advice.