Tip #1: Closing off rooms doesn’t lower the heating bill.
This doesn’t seem to make sense, right? After all, if you’re not heating a room or two, then you would think that you’d be using less energy to heat the house.
Closing or blocking a vent will make the room cooler, but due to the natural tendency of heat to flow from warmer to cooler areas, the cold room will end up sapping the warmth from the rest of the house. That means that your house will actually take about the same amount of energy to heat as before.
In addition, heating systems are balanced for the size of the house. Closing or blocking heating vents can stress the heating system by increasing the air pressure in the ductwork and making the unit cycle on and off more frequently.