There’s an interesting shorter topic that the Conversation article also responds to.
The OP suggested Choice might consider assessing RC Air Conditioners on how well they warmed one’s feet in heating mode.
The Conversation article offers a scientific view as to ‘why it is so’ or ‘not so’ and how to improve the outcome. It’s due to the home/room design and insulation/heat losses from the room. Useful advice for anyone choosing to convert from gas and considering a high wall mounted split system RC air conditioner.
