Gnats in House ~ 1st Timer

Hello Everybody,

Happy holidays and hope you are doing well. We're having a first-time
gnat infestation (6 year-old home) and would appreciate some advice. I
first noticed the problem at a window sill the last week of Nov while
I was setting up the xmas tree. We didn't seem to have noticed
anything then but now it is annoying enough. Where are some other
places they might nest?... Tommorrow I'm going to check out everything
and wouldn't mind some directions (Mr. Brady?), TIA.

agp
010205