It has nothing to do with efficiency. If the plenum and/or ducts are not installed and taped correctly or if someone shuts off a register somewhere in the coach, an air flow restriction can occur. This is compounded by running at a slow fan speed, which also simulates an air flow problem. If everything is installed correctly and the return filters are clean, you should be able to run at slow fan speed with no issues.
The exception is... If the unit(s) are undersized for the space you are trying to cool, common in RVs, then the AC runs constantly and over an extended period will freeze up.
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2011 Outback 277RL
2013 F250 XLT Crew Cab 6.2L
Bitter Gun Owner
Bitter Clinger
Armed Infidel
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