Comment Re:QuDruple ypur costs (Score 1) 361
Adding a further "me too", that this statement is entirely wrong.
Both a (single cycle) aircon and heat pump us a compressor, heat exchange and Boyles law to "move" heat between outside and inside. The energy used is to drive to compressor and not directly heat or cool anything.
When I grew up single cycle aircon did cooling, heat pump did hearing.
A reverse cycle aircon can do either cooling or heating. Either way its functioning is identical to the single cycle or heat pump when used in that fashion. But as I said in a separate comment - surely ALL aircon are reverse cycle now? In Australia the have been for 20+ years.