I installed my own Heat Pump (Pioneer) setup in my RV. I evacuated my system using a vacuum pump myself, total cost was around 3k. Got Home Assistant working through a hacked Local Tuya script.

This unit is 22 SEER.

+1 for a LOCAL API that doesn't require the cloud and +1 for a self install. I can buy two whole higher efficiency Pioneer units for your $6k install fee