What happens when the AC vent is open or closed?
What happens when the AC vent is open or closed? But when less warm air is blown over the cold coils, the coils’ temperature quickly drops and freezes over as moisture from the air hits them. And eventually cold refrigerant can flow back to the outdoor unit, destroying the compressor. (This issue is called “slugging.”) Why do you need vents in your air conditioner? Adjust the vents to get the most out of your air conditioner. An air conditioner, whether a window unit or a central air conditioning system, keeps your house cool when the weather outside is toasty warm...