I believe this another of those personal choice, personal comfort zone decisions. We have the 3400 and it is wired for the 2nd AC but we have not considered buying one. We lived in it in 90+ temperatures (no humidity) and was not uncomfortable. We do use fans when it is warm. We are in an area in California that gets very hot in the summer so we are use to warm temperatures and that may make a difference. Also this area does not have the humidity that the midwest and east has. When we fulltime we plan to not be anywhere where a 2nd AC would be needed. Just our humble opinion.
Happy trails............................
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