I know this is one of those "how many angels can we fit on the head of a pin" questions, but I need some information.

Next year I will be selling my condo here in FL, and will be looking to live in my 313RLTS. In FL during the winter monthly rates are quite high but I've noticed some other gulf states (AL, MS, LA) have much lower rates - but no doubt I'll need to run the furnace. I've never filled a propane tank (not even on a grill, it's always been charcoal LOL) so when I just checked propane prices and I saw $3.99/gallon my eyes popped out of my head.

It's now got me wondering how long the 2 x 30 lb tanks last in a winter in S. Alabama, MS, etc. where average temps Jan-Mar are low-mid 40's. Being acclimated to SW FL temps for the last 15 years, we keep the house at 76 degrees year round. Also, how much heat does the fireplace (electrical) put out? I've actually never used either except when we tested it at PDI.

Any feedback would be helpful. Thanks.