The newest Hearth & Horizon story, The Cold Corner of the Dormitory, is set in an invented Camino hostel in Galicia in 2053. A pilgrim finds bed bugs in bunk eleven, and the volunteer wants to run four fan heaters overnight.
The physics under the story is the same curve as a freezer warming in a power cut, run the other way. A thick mattress approaches the room's temperature exponentially, so the core lags the air. For a room at 55 °C and a core at 18 °C, reaching 45 °C takes ln(37/10) = 1.31 time constants. If the mattress time constant is 45 to 75 minutes, that is roughly 1 to 1.6 hours before the two-hour hold even starts. The coldest spot (here, a bunk against a granite wall) sets the schedule, and a probe there is worth more than the thermostat.
The story also keeps the safety side in view: four heaters at 55 °C draw about 8 kW on a circuit that carries about 7, and power banks, aerosol cans and candles do not belong in a hot room. The published lethal-temperature figures vary by strain and method, so the story's end note says its numbers are illustrative, not pest-control advice. Fiction, text only (the audio budget is over its cap).