smile711,
Those ladies with the cold tootsies just love sitting on a couch with a heat vent! We've spent two winters in the Benson, AZ area (where the temperature can drop into the low 20's) without any heating problems. DW loves to sit with her feet close to the heat vent. She uses a small folding chair (with open legs) to support her legs when the heat is on.
Some members use catalytic heaters to keep warm when staying at a location without shore power. We recently purchased a Portable Buddy Propane Heater as a back up heat source.
http://www.mrheater.com/productdetai...catid=41&id=24
Another new acquisition (new to us) is a heated mattress pad. It is difficult to heat the bed area in the 2720 SL so we also use a small electric heater pointed towards the bed. At night it is turned down or off, depending on the ambient temperature.
http://www.rvpartscenter.com/Product...=84&CategoryID
Good luck with your search for TM.