Many people make the mistake of closing heating (or air conditioning) vents in rooms they don’t use. It can seem sensible, as we assume that doing so will redirect more heated (or cooled) air to other rooms that we use regularly, or that it will draw less air from the system, costing us less. But in reality, the heat pump or air conditioning unit is likely to still keep generating the same amount of air, but with some vents closed, there may be more pressure on the ducts, which could cause them to leak, while damaging your overall system, too.