I've got a concentric dual hose unit from Midea that I use in emergencies when my central unit is out. I just put the hose through the dog flap on the back door

I've got a concentric dual hose unit from Midea that I use in emergencies when my central unit is out. I just put the hose through the dog flap on the back door when I run it. I'm sure you could figure out a solution if you actually wanted to be comfortable.