What is the name of each of these three formats (or form factor) of air source heat pump outdoor units?
- LG LMU300HHV - Variable speed, 4 zones, 30 kBtu, 20 SEER
- LG LMU480HV - Variable speed, multiple zones via branch box, 48 kBtu, 19.5 SEER
- Trane XV18 - Variable speed, multiple zones via branch box, ?? kBtu, 18 SEER
Tried to get models that are relatively close in terms of functionality. It's understandable that larger models can have more capabilities but I'm posting this to try to factor this out, and get the name of the form factor.
Ducted vs ductless
Some manufacturers label their heat pump as ductless but how do they know if I'm using ducts or not? Or is a ductless heat pump referring to the usage of refrigerant line-sets to indoor fan coils? Isn't that 100% of all the heat pumps though? There doesn't seem to be a type of heat pump that directly cools or warms the air then pushes that air straight into ducts in the home. So it can be concluded that ducted vs ductless refers to the overall system, and has nothing to do with the form-factor of the outdoor unit.
Seems like some people tend to apply the word 'mini-split' to the first one but from my research mini-split just refers to the fact that each indoor unit services a single room instead of the whole home. Seems to be a catch-all that covers both 'single-split' (1 outdoor unit, 1 head) and 'multi-split' (1 outdoor unit, 2 or more heads) as long as the rooms being serviced are separate. So again, words like 'mini-split', 'multi-split', and 'single-split' refers to the overall system, and has nothing to do with the form-factor of the outdoor unit.
Inverter vs something that's not an inverter?
I was tempted to name the first two "inverters" and the Trane model an "older non-inverter" but according to this site the old Trane form factor is also an inverter.
Asian-style heat pump?
One potential candidate in the factor of the naming is that the first two styles I posted above from LG appear to be very common among Asian-Pacific brands such as Daikin, Mitsubishi, LG, Samsung, Fujitsu, etc. That is not to say that North-American manufacturers don't also have this form-factor (Trane has the XV19 in this form-factor) but they don't seem as common.
Reiterating the question:
How do you name these three different forms of heat pumps?