The 2nd A/C for the bedroom is one good solution. We did not have a Heartland dealer near, so we opted to go with the "best" free standing A/C at Home Depot (about $500). The supply access was cut on the "driver's side" of our new BH3670. A factory style exterior fixture was installed at the inlet site. We are now beginning our second year of 110 degree+ summer temps in the Arizona desert. IT WORKS GREAT. We do not have your humidity levels, which certainly complicates the situatiation. But, you can "hang meat" in our bedroom during the maximum hot AZ summer. Some on this site were unbelieving of this arrangement. Been there, done that, and it works very well for us for less dollars. Hope it works for you also.
This is NOT a window unit. It stands in our bedroom closet and exhausts thru the factory type vent on the side of our BH.