[1ncorrect]

This equipment would be installed outside, the difference being to position it near, or coupled to, the compression loop of the heat pump. When the pump is running, it draws from the battery, which will need to dissipate heat through its operation. Why not capture that heat and redirect it where desired.

In summer, you could decouple it and use standard separate heat dissipation mechanisms.

[blitzar]

A black body catching some rays would give a decent boost (for part of the day at least) - https://www.youtube.com/watch?v=FtfaZMahSUU - just putting the split unit somewhere that catches the sunshine would probably be a non negligible positive!

Once we go down the heat extraction / transfer path some interesting efficiencies should crop up - any waste heat (higher than ambient temperature) exiting a property could reasonably be captured and used.