system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does an empty/abandoned house deteriorate faster than an occupied but also neglected house?
gpt
Abandoned houses deteriorate faster because they aren't used.

The temperature of the homes isn't adjusted to human living standards which leads to the materials being subjected to harsh temperatures. 

The faucets aren't used regularly enough to wash away the mold spores that accumulate from the air. No one is there to kill the mosquitoes or flies that grow from the stagnant water.

No one is there to throw away any moldy or rotting food.

No one is there to shut the windows when it's cold or to turn on a dehumidifier when it's humid causing more wear on the materials.

Of course, this only applies to modern buildings, which are generally wooden structures. Stone structures are generally more resistant to change and may look the same 50 years after abandonment if there is nothing rotting inside.