Getting the Right Size Minsiplit
I’m looking to install a minisplit for the main living space of a mountain cabin (that currently relies on electric-resistance heat). I’ve run the Manual J calculation (using https://www.loadcalc.net) as well as the alternative sizing tool at https://hvac.betterbuiltnw.com . They agree remarkably well, that an 18Kbtu/hr unit would suffice. Almost – and I’d hate to get it wrong.
I like an 18K Fujitsu unit, specs here: https://ashp.neep.org/#!/product/51830/7/25000///0 , particularly its remarkable minimum output of 2800 btu/hr at 47-degrees. That is less than a hair dryer !
But the 24K version of that model has a minimum 47-degree output that is barely higher, at 2900 btu/hr: https://ashp.neep.org/#!/product/51831/7/25000///0 , while providing a bit more margin for error at 5 degrees, and costing maybe $200 more.
Why not go with the 24K unit ?
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