Our Mitsubishi heat pump uses RF communication between the thermostat and the air handler. No wires needed at all.No-one's mentioned a hidden cost of installing a high SEER heat pump.
By necessity they are either multistage or infinite variable.
Both of those require more wires between the air handler and the thermostat.
Any house over 25 years old is likely to be stuck with 4 wire thermostat wiring in the walls.
All the 13 SEER units are going to be single stage, and work fine on 4 wires.
There's tricks that can be done to expand this to devices that need 5 wires, but you need more than that for a high efficiency heat pump.
Ripping up walls and ceilings, and/or stapling a wire around half the outside of the house is an extra cost.