Rod Speed wrote:

Corse it will work fine. No reason why the secondary system
cant have a slightly lower than normal temperature set so it
recovers from the setback in a decent time and then stops and
leaves the primary system to get the temp back up to normal.
Thats going to happen fine since the temp difference is well
within its capabilitys.

If you shut the booster off before the central area gets up to temp and
rely on the primary system then bringing it up to temperature then,
this central area catches up quick compared to the rest of the house.
Not much heat from that booster trickling into the rooms in that time
frame.

Maybe the central area gets back 4 out of 5 degrees in one half hour,
and in another hour, the central area warms up the last degree. Primary
system is off. No heat to the rooms. So you really need to think about
your controls and where exactly to put that primary stat.

Rooms are no where close to warming up. Only way to warm up rooms is to
over heat the central area. So nice orange, warm up the core and who
cares about the rooms, but we need an apple.

Strips will warm the whole place up. The ductless booster can't without
overheating the 'core'.

So maybe go back to the dual ducted systems with back draft dampers and
the swamp cooler with it own ductwork and tell me it is viable. Or you
could still explore the ductless spit in each room too.