When comparing specs from the same model line I noticed that the maximum BTU/h goes up as the tonnage goes up but the minimum BTU/h for heating, stays about the same.
Let’s compare 2 units for heating.
9000 BTU/h –> 5700-11910
18000 BTU/h –> 5620-18540
Assuming the same price, which unit would be the best choice with a 9000BTU/h house?
Just looking at the range I would say the larger unit because it the lowest setting is the same as smaller unit but it as more headroom for those rare very cold days.
But that’s assuming the units can regulate their output very precisely and not just 3 BTU settings.
Or is the ideal sized minisplit the one which has the modeled heat load about in the middle of it’s capacity range?
Short cycling is bad for efficiency and lifespan of the unit.
I wonder what happens during the days the heat requirement is only 3000 BTU/h.
Are units with a minimum BTU/h and equal HSPF the best for those days? Or is the difference so minimal it’s to be considered noise?
GBA Detail Library
A collection of one thousand construction details organized by climate and house part