How to prevent spiders from entering the house?

How to prevent spiders from entering the house?

Preventing spiders from entering requires two approaches: blocking entry routes and reducing food sources that attract them. Spiders are most likely to enter homes in autumn and winter (October-November) as outdoor temperatures drop and they seek warm places to overwinter.

Seal entry routes

1. Door and window sealing, check screens for tears; ensure the gap under doors is less than 5 mm; install weather stripping if necessary.
2. Wall cracks, seal cracks in corners, air conditioner pipe entries, and wire openings with expanding foam or cement.
3. Ventilation openings, install fine mesh over exhaust fans, air conditioner pipes, and ground-level vents.

Reduce attractants

Spiders enter homes because there is food, other small flying insects. Reducing flying insects will naturally keep spiders away:

• Install bug zappers or sticky flying insect traps.
• Keep kitchen countertops clean; clean up food residues promptly.
• Dispose of garbage daily, especially kitchen waste.
• Check if potted plants are breeding small flies (e.g., fungus gnats).
• Minimize opening windows at dusk when flying insects are most active.

Outdoor lighting management

• Replace outdoor lights with warm-yellow lights (sodium lamps), which are far less attractive to flying insects than white lights (mercury lamps).
• Do not leave porch lights on all night; use motion-sensor lights instead.
• Bright lights outside windows attract flying insects to the window, and spiders follow.

Chemical prevention

Spray deltamethrin-containing household insecticide on window frames, door frames, corners, and baseboards. Once dry, it forms a film; spiders that crawl over it are poisoned. Combined with physical prevention measures, the effect is better.