Just purchased new Keystone Cougar High Country 321res. It is 35' and has the polar package and three slides. The A/C could not keep up 15000btu. I was told large trailer one unit cant do it. Added 13500btu in the bedroom and slide out covers over all three slide outs along with external sunshades on the four largest windows. The only windows uncovered are four small, on the side of the slide outs and two under the awning area that get shade from the awning. Both A/C units still cant keep up. Bedroom stays cool but the other end of the trailer starts out in the morning at 70 and while running non stop then climes to 80+ by the end of the mid day. This is on a 91 to 95 degree day and we want to go out west to even higher temps. Is something wrong both units seem to be blowing cold. Not sure what to do next, considering covering the remaining windows but then don't know what to do if that doesn't work and I don't think it will. Is the polar package all bull just to sell trailers.
Something is not right with your coach. My Tango is 30 feet and
one AC unit will cool it in about two hours from ambient outside of 100F plus to around 80F inside. I think about 20 degrees differential is a realistic value to look for in an RV AC unit's performance.
