2019 our furnace went down the Friday just before Christmas. Took 7 days to get it replaced due to the weekend and Christmas. Three $35 space heaters, the mostly decorative stove in the wife's office, and 6 dogs kept things livable even though the outside temps never rose above 10 degrees Fahrenheit. Put two heaters in the basement, one on the main floor, and let natural convection and the stove handle the second floor.
Keeping the blower running helped a lot as that kept warm air distributed fairly well. The suggestions of keeping cabinet doors open is a good one too, especially if water pipes run along an outside wall. Haven't had to run water but homes are fairly well insulated up here and we have learned long ago to place anything carrying water away from outside walls.
