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Old 09-24-17, 05:00 PM   #10
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Originally Posted by oil pan 4 View Post
The problem with these units when heating or cooling is the air they draw into the house to move heat.
They work alright cooling since they are drawing in air that is maybe 10 to 30F degrees warmer than what they are trying to cool. The real problem comes when the temperature difference is 50F or more.
When in cooler mode the manufactures suggest the owners of the two hose models plug the intake outlet and use it as a one hose unit if the temperature difference is high and / or if the humidity is high to get the unit to work more effectively.

Im not sure how that relates to energy savings , it does increase its effectiveness or ability if you exhaust them and let them draw in air from cracks etc

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