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Haven't you ever wondered why relative humidity is a thing? Why don't they just give water content as grams of water per gram of air? Because warm air holds more water than cool air. For instance your 95F 10%RH air, when simply cooled to 70F, now is 24% relative humidity even though it has the exact same amount of water. I bet you didn't realize that, or ...


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Hygrometers aren't super accurate +-5% is easily within tolerance on the cheaper ones. So you go from 75F / RH 33% to 76F / RH 40% and you wonder where the 7% came from? A pair of dogs could definitely add 7% RH in 4 hours. Hell if you stand near a hygrometer in a house you can increase the reading with the moisture emitted by your body. Water can come up ...


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I saw a question VERY similar to this answered on This Old House. Here is the link to the video that explained why it happened and how to fix it. Hope it helps.


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If your drip tray in the inside unit has standing water this will cause high humidity when heating. Other than this there is no way for a heat pump to generate moisture in heat mode.


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