One heat pump set to 2 deg C higher than normal, or two heat pumps?
After reading some recent discussions in another thread, about it being more efficient for a heat pump to run constantly instead of cycle, I decided to run an experiment. It’s warm here today in my zone 6a town, 10 deg C, so I shut off my upstairs ductless mini split and ran only on the downstairs unit. It’s been 24 hours so far. It looks like to get a decent temperature throughout the whole house I’ll need to run a 1-2 deg C higher setpoint on the downstairs unit.
My question is, would it be more efficient to run the one unit with the higher setpoint, or both units as the normal setpoing?
On the main level is a Fujitsu 15RLS3H, and on the lower level is a Fujitsu 12RLS3H.
As always, thanks!