Most of us regularly remove the lint from our dryer's lint trap on a regular basis, but have you ever cleaned or checked the outside vent connected to your dryer? It's imperative to make sure the vent isn't just clean, but that the flap opens and closes properly. If the flap is left wide open, it can allow cold air to flow into your home during the cold winter months. If your clothing doesn't dry completely after a normal drying cycle, it's a good time to check the dryer vent. There are professional services that can inspect, fix and clean the vent for about $150. They'll also make sure there aren't any wild animals who have built nests in the vent lines (they love the warm air) and will get everything working as good as new.