If your house seems too cold or too warm during certain times of year, take a look around - you might have furniture blocking your air vents. When you block the air from getting where it needs to go, you make your AC or furnace work harder, which results in higher energy bills and more pollution. Think about rearranging your couches and dressers so you can maximize air flow, or get one of those handy deflectors that can help push the air to the right place. Then, when your vents are clean and clear, you'll be cool as can be.