The rated output of the largest of XLTH series (AOU-15RLS2-H) at -15F (-26C) is 15,000BTU/hr, which is comparable to the popular Mitsubishi MSZ-FE18NA at that temp. The Fujitsu 1-ton puts out a bit more heat than the -FE12NA at low temps though. The Mitsubishis installed at a deep energy retrofit project I was involved with in Worcester MA ...
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