The official start of summer isn't until June 20th, but it feels like it's already here. Temperatures are steadily increasing, the days are long, and people are doing whatever they can to beat the heat. Speaking of which, a lot of folks will tend to leave windows and doors open during these summer months to enjoy the fresh air and avoid over-use of the air conditioner. After all, leaving doors and windows open while you're home is the safest time to do it, right? Unfortunately, that's not always...