Royal Sovereign not keeping the room cool.

I would try writing or calling...
http://www.royalsovereign.com/customer-support/contact-us.html

It is supposed to shut off when the room meets the temperature you set it for. Are you saying it shuts off before the room cools to the temp you set it for?
What do you mean "..last a few days...?" Is it new only a few days and then break?
Be clearer if you need help.

according to this website:
http://www.searspartsdirect.com/partsdirect/part-model/Royal-sovereign-Parts/Room-air-conditioner-Parts/Model-ARP900E/3229/0904032/50024022/00001?blt=06&prst=&shdMod=


the part is no longer available.

when I checked on sears website:
http://www.searspartsdirect.com/partsdirect/part-number/900E135/0042/403


it shows that there are no authorized substitutions.

I assume you are looking for the window kit for ARP-9411 Portable Air Conditioner. If so, contact
Royal Sovereign Customer Support 1-800-397-1025 .

Hope this helps you & thanks for choosing FixYa.

Probably needs the Freon gas topped up.

try unplugging the unit and depressing the power switch for 10 seconds and then reconnect to power good luck

Here is the solution to all parts! :)
http://www.searspartsdirect.com/partsdirect/part-model/royal-sovereign-parts/room-air-conditioner-parts/Model-ARP1000ES/3229/0904032/50028633/00001

Either put it over a drain or, stick a cork in it.

Assuming you are in the United States....

This unit should work fine on a 15 amp circuit assuming there aren't several other loads on the same circuit.

You didn't say what the BTU was for you unit, but there are about 3.41 BTU's per watt. Multiply the btu rating of your unit by 3.41 and then divide by 115 or 120 (your house voltage in the U.S., use 220 for Europe) and that number is the amps.