Ok, so I use the term "gnat" loosely, as described in your article. During the day when the sun is out, I don't see bugs in the house at all. We live on the 2nd floor of a 2 story apartment building, and we just happen to be right on the river (which is brackish water). At night, we turn the lights on inside (of course). I notice little flying bugs attracted to the lights. I call them gnats, but mostly they all look the same and are too large to be no-see-ums. I try to have the windows open to conserve electricity, especially when a nice breeze is coming through.
That was until the night I was in the back bedroom on the computer, playing a game, when I non-chalantly took a great big drink... only to my dismay when I saw out of the corner of my eye, a gnat had landed in my glass (low-concentrate of white grape and water).
Now the only thing I have been able to do so far is to close all the windows when the sun goes down and turn on the air conditioning. That helps keep them out.... but is sorta backwards. I'd rather NOT use the air...
I found a product at the local farm store called CV-80 mfg by Waterbury Country Vet. I heard people say they spray it on their screens and it keeps the bugs away for awhile... but upon reading the product label, it looks pretty dangerous.
What else can I do?