I know its amazing I used to keep sweaters for summer and T-shirts for winter in my drawers at work. Apparently the last place I worked for 10 years they actually were supposed to work but some damper in the ceiling broke that adjusted to air flow so we weren't getting any changes from the switch at all. We had no idea until it broke even further and began making a smashing noise in the ceiling---the entire vent line had disintegrated too. On the plus side there we were getting temps that could be adjusted by opening a window---we actually had windows that opened there while now we have these huge all wall windows that can't be touched so I'm so happy the heat/cold works.