room upstairs always dry/hot air tried a humidifier does not work what else to do .

If you own your house, and can afford it, an attic fan is the best solution. It will make all upstairs rooms cooler: you will notice the ceilings of upstairs rooms will be noticeably cooler. If that is infeasible, a ceiling fan will help. Barring that too, buy a few floor or table fans. Bed, Bath, and Beyond ( l do not work for them) has good ones at good prices.