I have had a portable heater/AC installed in the bedroom for years that currently vents out of a window. I recently had AC installed in the house, but found that my wife has gotten so used to the portable machine running as white noise that she has a hard time sleeping without it.
Would there be any potential issues if we ran the machine on heat mode and just let it vent into the room? I'm concerned about moisture issues over time in the window that it vents from.