We have one of those electric things in which a small mat is placed and it really does seem to help. While the mossies do still come into the house, they don't seem to bite so I'm not sure how it works. All I know is that I can sleep with my windows open if I have it plugged in and in the morning there are hundreds of mossies but none have bitten me during the night. I will certainly try the sound device mentioned in a previous post as I've never tried one so am keen to see if it works.
OP, you could also just do as the Thais do - keep a small fire burning, making sure it produces vast amounts of smoke
