Cool off interior when exterior is cooler


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Old 01-04-19, 10:17 AM
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Cool off interior when exterior is cooler

Hello everyone, there is quite a few times the exterior of a room is a lot cooler than the interior. Is there a really good way to utilize this to my advantage. I am thinking of some sort of intake from the outside with a filter on it.

-Mike
 
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Old 01-04-19, 10:28 AM
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This is why some homes have a whole-house fan-
removing the warm inside air and replacing it with cool outside air can be more cost effective than using an air conditioner to remove the heat FROM the inside air.

The simplest the solution is to use passive cooling "stack effect" which is based on the tendency of hot air to rise. When you open an attic window to let hot air out, you also open a window on the shady/north side of the house, open the doors so there is a route between them, and the rising warm air will "draw" in the cool air. Free passive cooling.

If passive cooling isn't sufficient, put a fan in the window of the highest/hottest room and blow that warm air out. Open a window in the lowest/coolest room, and you'll pull cool air through.

I guess you might place a furnace air filter in the open window to catch dust or pollen, but I've never bothered with that.
 
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Old 01-04-19, 11:23 AM
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I just open the windows, seems to work every time!
 
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Old 01-04-19, 03:53 PM
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This is called an economizer. Common in commercial equipment.
 
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Old 01-04-19, 05:26 PM
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Thanks everyone,

I guess I should have specified that I got no windows. looks like I might have to make some holes someplace and put in a inline fan or something.
 
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Old 01-04-19, 11:34 PM
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I should have specified that I got no windows
What kind of place is this?
 
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Old 01-05-19, 02:13 AM
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Some holes will not help you.
You need to move a very large amount of air to make any difference.
What the small hole would do is make it possible to pass refrigerant lines through to utilize a mini split air conditioner to move the heat from inside to outside.
 
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Old 01-05-19, 06:33 PM
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The room has computers in it and instruments. I was thinking perhaps a 6" hole on the wall to the outside with an intake vent and 6" inline fan. Sense it has instruments I would like the air filtered if I can.

-Mike
 
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Old 01-05-19, 07:09 PM
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How large of a room is this?
You’ll need a larger duct then 6”. And a fan capable of more CFM.
You’ll also need either an exhaust fan paired with the system or a barometric relief. Pumping in outdoor air will pressurize the room.
 
 

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