When we lived in a highrise with utilities including air conditioning included the bedroom was always to hot. Big slider windows with sun beating through all evening we needed extra cooling. Since so high up we bought a portable roll around A/C unit that had flexible duct that fit in window. Even with 6' sliders the kit included panel that expanded. It had a flap in panel that the exhaust tube from A/C fit into with a screen on outside.
One we had had thermostat and remote. It worked great for both the master bedroom and master bath.
This is kind what talking about:
http://www.homedepot.com/p/SPT-12-000-BTU-Portable-Air-Conditioner-with-Remote-WA-1220E/202105046
All all be in window would be a plastic panel you cut to fit window and a screened flap that exhaust from A/C fits into.