for insects problem
i can SHARE some facts with you
my house is vacant and all door / windows closed
but we still go those insects
I guess it is generated
1. from the 'fresh air supply'
2. from some eggs laid by some pioneer
when the eggs hatches
they give us trouble and give eggs and die within a day
if mr/mrs 一家四口 wanna talk about the smell
i wanna ask whether you live in TOP floor first
this is HIGHLY related