The technology is fairly new and doesn’t behave the same as traditional home heating methods. I like to use the dawn of the microwave as an analogy: microwaves reheat food faster and easier than traditional methods but are terrible at making toast.
Just as early adopters had to learn the best applications for a microwave, we need to revisit the traditional heating maxims to optimize HP performance.
One common statement is that reducing indoor temperature by 1°F (0.6°C) reduces a home heating bill by 1%. This isn’t much. Most people would probably prefer a warmer temperature on a given day over a few extra pennies.