Install a room dehumidifier. Use a small unit to dehumidify less than 200 square feet. Purchase a bigger unit for a larger space.
Drain the unit frequently. If you have a very humid home, you may be pulling several gallons of water out of the air every day. This means the collection receptacle will have to be emptied several times. Do not let the unit run unattended unless it has a shut off feature when the receptacle gets full.
Hang a hygrometer in the room. This device measures the relative humidity in the room. For cooling purposes, aim for a humidity level of less than 30 percent. Use this device to test how well your dehumidifier works. If you can't get the levels in the room lower, you may need a larger dehumidifier.
Run a few fans in the room in conjunction with the dehumidifier. Moving the drier air around in the room will drop the relative temperature a few more degrees and make it feel much cooler in the space.