There have been times when we go to the cabin and hunt coyotes in January and February the cabin inside temps have been in the single digits or teens. It takes awhile to warm up the place. Would be great to have it about 50 degrees.
I have a 1400 sf. house in the UP, I'am there at least 7 days a month year round it heated with propane, when were there wood stove. The thermostat is left at 45 when not there, past 2 winters have been very cold I pre-buy propane it usually cost about $800 a year.
When we arrive I turn furnace up to 68 and get the wood stove going it take about a half hour to warm it up. About a day to get the walls warmed up.
My thoughts and several other people I've talked to over the years, its not good for a house to be allowed to freeze then be warmed up and freeze maybe several times a year. Not good for foundation a very good possibility of moisture building up in walls that could cause "black mold".
