A lot of weeds are growing in my backyard that's incomplete. Should I ignore it or kill it? The excess rain here in Oregon keeps them growing even if I kill it. Any ideas or suggestions? My house has about 15 air vents as you can see from the enclosed photos. What is the difference with the vent being opened or closed ? Am I suppose to close the entire vent during Winter in order to keep the house warmer? And open them all during Summer to keep the house cooler? Thanks for your help.