This is a cheap temporary solution so the tenant doesnt drive you crazy in the meantime. our windows slide left to right not up and down so there is nothing to hold a window unit in place.. it would be dangerous to put a window unit..his apartment runs length wise and if he did open the window in the front of the apartment ( living room dining room) and his bedroom in the back it would cause cross ventilation but he refuses to open the windows for safety reasons.. we are in a nice area and he is on the second floor.. our living room dining room have ceiling fans and we gave them 2 large stand up rotating fans.. the lease does say there is no compensation for a temporary lose of heat or a/c.. so would that still leave me liable for his hotel bill?

It is oriented lengthwise east-west with the street to the west and an alley on the east. 

I have a longer, two piece one that's about 9' long for cutting lengthwise.