I was thinking that if it is really hot and humid outside that he should set it to closed. If you have a typically installed air conditioner unit with a central air return, shutting doors is one of the worst things you can do. Any ideas? I had that problem with my basement HT initially. usually they use air exchangers with air to air heat exchangers in them so they don't loose as much energy though. sounds like you got it. After all, there's something more to be said for wasting energy – and a lot of it. I'd think this would be more efficient for a widow unit as well.

If you close your AC vents, you actually increase the amount of conditioned air that gets wasted via duct leaks.

JavaScript is disabled. On my old unit the vent was a small trap door that sucked air in, but didn't draw ALL the cooled air from outside, just added some fresh air to the output. Unfortunately, this will only lead to extra wear and tear. Open means you get outside air, closed means you get inside air.Thanks. The recirc setting can help a lot if you are trying to reduce the humidity quickly, not just the temperature.My brother tried it out, it blows colder with the vent closed. But will closing vents in unused rooms help cool your house better? StarTribune.com: Summer comfort is an open and shut case Fixit columnist answers this question: When a house isn't air-conditioned, is it better to keep the windows open or closed… The unit would be cooling already cooled air instead of the hot outside air. Additionally, the closed vents can elevate the amount of pressure in the system and can break ductwork seals, which further reduces the system’s efficiency.

The most efficent setting is usually the recirc only one, but it can make the air get really stale and in some cases unhealthy if you don't introduce fresh air into the system. I believe the vent should be open only if the unit is being used as a fan only and not cooling.

If you’re trying to get the most efficiency out of a central air conditioner: Leave all of the upstairs doors open. He called me tonight and asked me if the vent should be set to open or closed. Open—Or Possibly Close—Rooms You Don’t Use. This moves us to the major problem with closing air vents: pressure. It probably also depends on how tight or loose the house is in terms of airflow; a lot of times "sick" buildings are ones that don't get enough fresh air through cracks and vents. But when you close a vent (yes, even just a few), it increases the pressure inside the ducts. When you close an air vent, you reduce the number of avenues available to moving air, restricting flow. This was from a friend who used to design HVAC systems for large buildings; they tried to keep their mixing boxes so they would pull half/half. If you close a vent in an unused space, the system will cool and pump. usually they use air exchangers with air to air heat exchangers in them so they don't loose as much energy though. Run it a few days like that and see if you're comfortable. For a better experience, please enable JavaScript in your browser before proceeding.My Brother has an air conditioner that sits in the window of his apartment.

Then switch positions on each set and run it like that for a few more days. Which to open, which to close?Participate in over 40 different forums and search/browse from nearly 3 million posts.Post photos, respond to polls and access other special featuresGain access to our free AOP (Ask a Professional) Section to get real answers for your questions.

This is why your home uses a system of vents and registers to move air through the building.

This tip on how to cool upstairs of a 2-story home depends on if you’re using a central air conditioner or one of the supplemental air conditioning units we mentioned above. When you shut a door, the air that’s still blowing out of the vent builds in the room, pressurizing it. Leave Your AC Vents Open and Contact Blair’s Air Conditioning for AC Service Pressure Problems. Usually the idea setting is half open/half closed for recirc/outside air.

My Brother has an air conditioner that sits in the window of his apartment. However, the air will not be delivered into the space. He has a separate knob for "fan" & "cool". If you want it to be a cold as possible, keep the vent closed. I have no idea? He called me tonight and asked me if the vent should be set to open or closed. I have no idea?I believe that is like the recirculated air in your car. Note any change in comfort. This maintains a good balance of new air but also keeps the unit from working too hard.Well, a central unit draws all of its aire from inside and recirculates it.

The TRUE highest cost system is the system not installed properly... Return vents, winter summer? This will keep the inside of your air ducts frosty. (It’s right up there with closing vents and beating your outside unit with a sledgehammer.) Clean air filters play a major role in removing dust, dirt, pet dander and other allergens from the air. On balance, this idea sounds like it has some merit – if, that is, the air that is blocked from one room or rooms because of closed vents simply skips over to a room or rooms with open vents. You see, your AC pushes out cool, conditioned air through your ductwork and into your home. Try the following, since it is still the winter heating season: open top return grill dampers and close bottom return grill dampers on all sets like this throughout the home. Right...I was just quoting the basic principle.

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