How are you Organizing Your Festool and Systainers?

[Coen]

It's been a long time since I looked, but I seem to remember heat pump/mini splits that had an electric resistance coil for times when the heat pump was inefficient.

That doesn't make them more efficient..
It's also rather hard on the grid. Some local governments here require the resistive elements not be connected // disabled for new housing. That sometimes results in the heatpump being chosen 1 step bigger, but then running at higher efficiency.