I've been working on a heat loss/gain calculation for a trailer for about a week now to figure what size of a heating unite and cooling unite to use...GOD forbid if I had to figure that one...OY!..you'd have to figure all that crack-extended and retracted and add in the factor for glass and insulation plus the change in cubic feet and of course the wind factor....I have a feeling that is why some trailers are over heated[btu's] and under cooled[lack of btu's]...kinda of a best guess judgement....geof
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