Fhh, what did you use? I had a portable unit in my home and the exchange for hot air out was hot to get near. Meaning, you can control the temp. easier with a window unit, cause it was releasing heat from the tube going out. I got some "insulated" tubing to try it and did not try.
So, gave up on the portable all together! pr

About now, I think the question is: hot to keep the girls warm! pr