Don't know about their unit, but my one is 48KG, so lugging it isn't the easiest.
I would've though have it setup at the bottom of the house, have it running and only open a window at the top of the house...
Assuming no major air leaks in the house, the cold will displace the heat starting at the bottom, the rising heat then able to escape out of a cracked window at the top of the house,
Otherwise have it at the top of the stairs and hope that the falling cold will displace the heat