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When was the last time you had it serviced (or did it yourself)?
I would not increase the idle to fix this issue - the A/C should be reasonably cold at idle (like low 30's at the vents, AC on max, full blower, with the vehicle under a shade and not heat soaked) - even at first start after a few seconds to get the system up to speed (so to speak).
Heat soaked you could expect it to take a longer time to get to that temp at the vents on max, but it should still get there in a few minutes at the most. Check temps at the vents and then if not at stated above, I would troubleshoot by doing the following:
1) Clean the A/C coils at the radiator - get all the crap out of there checking for clogged passages. Those will affect A/C in a big way. Let radiator dry before next step. (Wet radiator will increase cooling and you don't want that yet.)
2) Check for obvious leaks - easy to identify by a build-up of dirt/oil residue at the connections of the system. If present, have system drawn evacuated - replace o-rings as necessary, service properly.
3) Start vehicle and turn AC to Max - check temps - if not at low 30's in about 2 minutes - go to step 4 - else, system is fine. Watch compressor - is the clutch cycling on and off rapidly? If yes, try bypassing the LOP switch (I believe these vehicles have one, but I don't have my schematics here to verify) After bypass, compressor clutch should stay engaged. If it does, you are probably low on freon and the system cannot build pressure. The clutch should keep the system active for a long time on start up on a warm day without bypassing it.
4) Now, run hose over radiator - check temps as you do this. If they drop inside at the vents, you probably have either a clogged set of coils (which you shouldn't if you cleaned them properly) - or are low on freon (R134a).
5) If nothing else found, have levels checked - service as necessary.
You state it gets cool as you increase engine speed - that pretty much rules out the compressor being bad - so you are looking at clogged coils or low freon. My money is low freon.
Hopefully others will chime in to make additional suggestions and make corrections to what I suggest.
Good luck to you sir!
01 F350 Dually 4x2 Long 7.3 - Manual - Mods: Hutch, Harpoon, Remote Fuel Filter, Southbend Clutch, Heim Joint, Gauges, Disabler, 08 Tail w/Camera, Pioneer Head w/Lockpick, Exhaust Brake, Rails, Air Raid, 06 Headlights, 50 cent. Coming next: Exhaust. Wish list: Train horn, 4x4 conversion, Exhaust, Turbo, Chip.
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