Do you have a cover? the sides have to be closed for it to work, but one could makeup some fast cheap sides kind of like what we did with the towel.That's an awesome idea Sumner, I'm totally gonna try that next time I'm out at anchor and it starts getting warm.
We were out in high 80 deg. weather in April where it was hot in the boat without the deflector, but with it we had to take it down near sunset as it was feeling too cold below. At night everything is closed up though except for the screened areas.
We never had the bug problem we thought we would have when we were there in March and April with the exception of down at Little Shark river in the Everglades where they were terrible the night we were there. We went below right at sunset and had no problems in the boat, but I had to put on long sleeves and a bug net hat to motor out of there at sunrise..
http://purplesagetradingpost.com/sumner/FL-spring-2011/FL-Spring-11-16.html
.... North of there in the daytime no problem and at night with the cover on no problem. If Ruth wouldn't of added the front and rear screens to the cover it would of been very hot in the boat though and the screened hatach also helps a lot,
Sum