Spiders settle where resources exist: food, moisture, and undisturbed structural corners. They remain completely indifferent to whether you set your bedroom thermostat to a cool 67°F or let the attic climb past 100°F. If prey insects move through your floorboards and your foundation pipes sweat with condensation, hunting spiders will occupy those spaces.
Eliminating standing moisture, sealing structural entry points, and stripping away prey insect access solves indoor spider problems. The temperature of the room is just the background environment they easily adapt to.
