Dear Ken: Do you like those little deflectors that stick on to the heat vents with magnets? Danny
In a word, no. The reason we put heat vents along the outside walls—especially under windows and doors—is to wash warm air over those coldest surfaces. The plastic deflectors you ask about will nullify that design. It’s a perception thing, too; the center of the room may be at, say, 70º, but the diversion of the heat flow will mean that the...