@macuaig and @pianocat low teens is not great! Can you do anything to mitigate that in the short run? In other words, getting a humidity system or purchasing a humidifier will take some time, but maybe there’s something you can add to help get you through this cold snap.
In addition to my humidifier and dampp chaser, I have a towel rack in my piano room with four dish towels that get re-dampened and hung in there to dry multiple times throughout the day (my husband works from home and he takes care of it during the day).
Another thing you could do is get a sauce pan and boil some water and then set the steaming pan on the floor in the piano room (on top of some towels or something).
I also used to take a shallow cooking pan (like a basting pan or brownie pan, something wide but shallow)and have about 2 inches or less of water in it and put that on the floor under the piano. Keeping it shallow is important because deep water won’t evaporate as quickly.
Good luck!
