Pests do not completely disappear in winter — they simply change their activity patterns and locations.

Many common household pests actually become more concentrated indoors during winter, shifting from being dispersed outdoors to being concentrated inside your building.

Cockroaches are dispersed and active outdoors and around building perimeters in summer; when outdoor temperatures drop below 10 °C in winter, they are forced to concentrate into warm indoor areas — heating pipes, refrigerator compressor areas, and around water heaters become their overwintering hotspots.

Indoor heating in winter accelerates cockroach metabolism — reproduction continues year-round in the warm indoors.

Rodents need more food in winter to maintain their body temperature — their activities inside walls (scratching sounds, gnawing sounds) are more noticeable on quiet winter nights.

Overwintering mosquitoes — fertilized Culex females, having accumulated large fat reserves in autumn, enter a state of reproductive diapause and spend the winter hiding in basements, attics, culverts, and tree holes; they may briefly awaken on warm days.

Aedes albopictus eggs overwinter in a state of diapause on the inner walls of discarded containers — winter is a good time to clean up these "mosquito time bombs" for next spring.

Silverfish and booklice rely on indoor heating to remain active in winter — they are more vulnerable in lower humidity environments.

Winter is an important but often overlooked time window for indoor pest control.