Is the register open and blowing cold air? Do you have a ceiling fan in the bedroom and is it blowing down (counterclockwise), how often are you changing your HVAC air filter? The only way fresh air supply ducts could even get dirty is via their supply air via the air filter? I never understood how a fresh air duct could need cleaned (or even be dirty) unless the filter was missing, very cheap or never changed? You can also get a remote thermostat for the bedroom connected to the main thermostat but I would probably consult a HVAC tech if all the other stuff has checked out vs. wasting money on duct cleaning, IMO.
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I will say the things that others are probably thinking but afraid to say.
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