Asked on Oct 1, 2019

How should I position AC/heat ceiling vents?

GlennDeeLifestyles Homes


My ceiling vents have vents pointed outward on each end and in the middle the vents only point one direction. When these vents are close to a window, do you put the vent so that the middle set of vents point toward or away from the window?

5 answers
  • Lynn Sorrell
    on Oct 1, 2019

    They should blow the air towards the wall. You don't want the air to be felt blowing on you directly if you're in the room. By blowing the air that direction you are 'washing the air' against the wall creating a current for the the return register to pull that air back into the system.The best option with any ducted heating and cooling system is to keep your vents open at all times. This allows optimum air flow for the highest possible energy efficiency. If you want to direct air away from a wall or corner, you can adjust the fins so they’re slightly slanted toward the room that you’re in. Avoid closing the vents entirely.Closing vents in your home isn’t an efficient way to manage airflow. Your HVAC system is designed to send a certain amount of air through the house, based on its square footage. It will continue blowing the same amount of air, whether your vents are open or closed. If you close too many vents, air pressure will build up in the ductwork. This causes your HVAC system to work harder than necessary at getting air through to the house.

    A room with closed vents and a closed door will also have a pressure difference. It will suck air in around the doors and windows as best it can, diminishing your energy efficiency and possibly impacting your home comfort by creating uneven hot and cold spots.

  • Laura Cooper
    on Oct 2, 2019

    Lynn is absolutely correct! This is the foundation of duct design (also known as engineering manual D) for an Hvac system

  • Lifestyles Homes
    on Oct 2, 2019

    If your vents grilles don’t have multi/position louvers, Replace them with new ones that do

  • Dee
    on Oct 7, 2019

    If you replace the vents make sure you have insulation around the edges so air does not leak out.

  • Glenn
    on Oct 8, 2019

    Place your registers where the air flow is towards the outside walls. In this manner it will help overcome outside air that can make its way through cracks, crevices, windows etc. And especially if you don’t have insulted walls.

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