Repairing a DeLonghi "Pinguino" portable air conditioner

I have a DeLonghi "Pinguino" portable air conditioner that blows air but does not cool.
Any guesses as to what is wrong?
Are these air conditioners worth fixing?
Thanks
TMT
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Thermostat, compressor, are the two most likely

Probably not if it is the compressor. Fix may cost more than a new unit.
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Thanks for the response....anyone else?
TMT
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Any idea as to how to determine which one it is?
Would I short across the thermostat to see if the compressor would start?
TMT
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