I have a "coolcat" (under the sink mounted heat pump/ac) in my Dutchmen pup. Took it out camping for the first time in three years...since total roof rebuild.... When I plugged it in the ac roared to life and froze us to death if we stood in front of it. Fast forward to middle of the night....started getting WARM up in the pup! Went to the ac.....and it was blowing but only moderately cool air... Probably just the fan blowing air over the ENORMOUS ICEBERG I could see behind the grill on the front! Literally, the rectangular part behind the grill was a block of ice. Turned it off, let it melt. Restarted, but battled the iceberg all weekend and never got super cold again. Froze quickly. Ok, here were circumstances: --Louisiana. Hot (90's....maybe bumping 100...in the middle of the day) and humid and wet like a swamp. --shady but un-level spot. Leveled very well with boards but the low side of the site was away from ac drain tube...wonder if condensation wasn't flowing out well bc of the pitch of the site? Saw what I considered to be not enough dripping going on for the amount of ice generated. -- that first night when it froze so badly I had the thermostat Waaay down, kinda as an oversight, honestly. But fan on continuously. After that kept thermostat at 75 or so....trying to not make it work so hard. Ok....I am very handy for a girl....love my power tools and such, but lean more towards carpentry than mechanics....so speaks slowly and describe stuff rather than name it. Ie: that metal ribbed thing.....versus ....the hydro-dynamic modulator. Thanks in advance!