For someone who's not in the industry, the Author has done a reasonable job. I'd add a few things: - Heat pumps have been around a while. In the southern US,

For someone who's not in the industry, the Author has done a reasonable job. I'd add a few things: - Heat pumps have been around a while. In the southern US, there are lot of older HVAC techs with a negative perception of HPs based on problems with older technology. Older HPs had less of an ambient operating temperature range, in which case the emergency heat would activate, reducing savings. - Re: fragmented markets, different states/cities/towns/municipalities have different rules, processes, procedures, etc. - Re: the desire for drop-in installations, the construction permitting and inspection process is a big fat roadblock which is linked to the problem above.