Title: Not for Heating
Review: This product might be good for air conditioning but it does not work for heating. I have two rooms on the north end of my house that are always cold. I closed 3 vents in other rooms and installed this booster and it didn't help at all. In fact, it may have made the room colder because it was blocking the air that normally comes out of the vent. The only reason I gave it two stars is because it arrived within 2 days, but now I am returning it.
Is this product review negative?