Originally Posted by drewtk
Another thing you could try is a portable dehumidifier. An electric one, not Damprid or a granular type that really doesn’t do much. Pulling water out of the air helps your AC work less and allows you to be comfortable at a higher temperature.
Yes, the dehumidifier will pull some moisture out of the air and reduce the latent load on the A/C unit but at the same time it adds sensible heat load to the space.
Basically, a mechanical dehumidifier id just another air conditioner. You have a compressor, a condenser, and evaporator and an expansion device. The air is blown over an evaporator coil which cools the air and reduces the moisture content of the air. This cool and near saturated air is then blown over the warm condenser coil and into the room, warmer than it entered the unit.
You have to account for the net gain in heat in the room for the load on the room A/C unit.
If an A/C unit is oversized and cycles often, the compressor is not running and not removing moisture from the room. For humidity control, you are better off with a slightly undersized A/C unit that operates continuously so that it removes the moisture.