Which is the best bug repellant candle?

I recently bought a house and am hosting my first ever BBQ. Whoo hoo! Haha. I shopping at Target and noticed there are a bunch of bug repelling candles. Do these things really work? Which are the best kinds? I live in Minnesota (two blocks from a big lake) so I'm gonna go ahead and ume I am gonna have to figure out how to deal with bugs....