Should the unit be recharged at some point? I don't think my a/c is blowing very cold air, just cool.

most likely have to install a line tap valve to charge. look for oil residue on lines to indicate leak. the evaporator is the weak point on most a/c systems.

Hello, anytime the unit does not blow out cool air I like to start with checking the airflow, check the filter and the evaporator coil for a buildup of dirt. If that check out ok then either the unit has a refrigerant leak or the compressor is not operating if the compressor is running than the unit is low on refrigersnt and can be recharged. In order to recharge the unit a piercing valve must be installed on the low side of the system, most window units do not have valves so one must be added to be able to charge the unit.

I think you are on the right track , it sounds low on charge. It can be recharged but almost every unit that is portable requires a licensed person to do the repairs because you have to cut into the lines and add access valves then evacuate the system then recharge it. This can be at a high cost too.Good luck

actually it can be charged like a car "if" it has charging ports which it won't have unless someone has installed them - which would only of happened if the unit had a leak previously. So, to answer your question a window unit can be charged like a car but it's a little more complicated than charging a car and I would think you'd need a serviceperson to do this.
Also, if you don't have charging ports already installed on the unit - the chances that you have a leak is not very strong. These are 'sealed' units and really do not spring leaks very often.
I would be more inclined to think you had an electrical problem, i.e. wire burnt off compressor terminal or something like that instead of leak.
Sometimes you can save a lot of money and time - by getting a qualified serviceperson involved.

yes, after 9 years it needs to be recharged. Have a shop with a good reputation do it. Dont go cheap. It should hooked up to a machine so you can see how much leaked out,and test for leaks. shouldnt be more than $100

Try recharging the AC unit.

Heat pumps have saftey circuits that prevent liquid flooding of the compressor. Inadequate airflow across the evaporator in cooling can trip this circuit. Have your package unit serviced with particular attention to cleaning the evaporator coil and be sure your filters are clean and changed frequently in the summer months. Hope this helps GL!