The thing with the tape and the post-it note seems to be working, so I'm OK with that solution for now. Post-it also says something like "If you are too warm, go to the dining room and turn thermostat down to 70."
At some point, I will probably explore a smart thermostat that I can view/control via Alexa.
Sis and I spent a few hours today decluttering the dining room and going through drawers. We have the entire back of sister's SUV filled with donations: tablecloths, cloth napkins, placemats, vases, serving platters, ice buckets, napkin rings, place cards. All the accoutrements for an alternate life that my mother is not living (and never really did as far as we can recall). Some of the stuff has clearly never been used. We could have a hell of a yard sale, but neither of us is up for that. A lot of it is really nice stuff, so we just make a point to bring it to a favored charitable thrift shop as opposed to the more convenient Savers.