It seems like common sense that spiders and insects will attempt to enter your home during the colder months if they don’t want to freeze to death. However, house spiders are usually not the same types of spiders that you find outside near your garden. Spiders that live indoors are specially adapted to survive indoors since the climate inside of a home is stable, and there is not much food or water available. Most outdoor spiders would not be able to survive for very long living indoors.
It makes more sense to think of house spiders as a separate species with special needs that are not in common with outdoor spiders. House spiders have had plenty of time to evolve along side humans within sheltered areas. In fact, house spiders are documented as going as far back as the Roman Empire. These house spiders never go outside and most of them call Europe home, and luckily they are harmless.
Have you noticed that most of the spiders that you find in your home all look similar?