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Originally Posted by Ladybug
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Am I just imagining things, or should it at least be keeping it 10-15 degrees cooler than outside? Any help is appreciated!
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How cold RV gets relative to outside temperature is a poor indicator of how well your A/C is working (relative to its capacity). I would not go by that because it may just be undersized, yet working perfectly.
A better test is to take temperatures going in and out of A/C inside the motorhome. As discussed in other threads, that will indicate much more information regarding whether you’re getting the full 15,000 BTU/hr of cooling that it’s designed to put out.
My technical guess is that one 15,000 BTU/hr A/C is insufficient on a hot day to cool a motorhome that is 32’-7” long and has a full wall slide. That’s roughly twice as large a living area as my previous Class C and it didn’t cool great on hot sunny days with one A/C.
Notice in specs that Thor now offers two 11,000 BTU/hr air conditioners for floorplans KW29 and larger. That is almost 50% more cooling than a 15,000 A/C and much more than suggested “upgrades” can provide. Some upgrades that fix problems like leaks are definitely of value, but others that supposedly increase the A/C’s cooling capacity are more questionable as to their magnitude.
Depending on your tolerance to heat and humidity, you’ll probably end up needing a second A/C on hot days.
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