So how does a cold air return work anyway?
If you've ever looked at those large grates on your walls or floors and wondered how does a cold air return work, you aren't alone. Most people focus on the vents that blow out the nice, conditioned air, but the return vents are actually doing half the heavy lifting for your entire HVAC system. Without them, your furnace or air conditioner would essentially be trying to blow air into a balloon that's already full—it just wouldn't work. ...