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The compressor needs to run, does it run? If it runs and the outdoor radiator is not producing heat, then it may be low on refrigerant. The compressor refrigerant lines, the skinny gets hot and the thick line gets cold under normal operation.
To recharge the unit, it needs to be leak checked and repair any leaks found, then recharged. The refrigerant type used needs to be known, a manifold gage set is used to diagnose and recharge.
If you have a window unit, you should have it serviced or replaced.
you will need a AC Tech to first 'repair' the leak and then to 'recharge' the system. Also, the Tech may have to 'weld in' service valves on the unit if it does not have them - which most window units do not have.
Note: unless you've had a 'leak' you'll never need to recharge the system. I would 'be sure' you needed to recharge the unit before having it recharged.
Sounds like you might really need to have a AC Tech look at the unit before you do anything.
From what you have described, it sounds like the compressor may need to be recharged with R134a refrigerant. Since the chassis will need to be removed from the outer shell and specialized equipment is required to recharge the compressor, it's best left to the pros.
The portable AC units generally have a customizable, exhaust hose window, termination kit that comes with the unit.. In other words it can be cut to fit. The one that comes with the unit will fit casement windows, as well as sash windows.
To further assist you, I have included a link to the Owner's/Installation Manual for the model you referenced. You may download and print it if you like.
Most new window units are using R-22 or it's most common alternative R-410A - but you will need to check the 'data tag' on the AC to be sure. All AC units have a data tag (either metal or paper label) - somewhere on the AC - which gives you model number, size, voltage, and type of Refrigerant, as well as other info.