not sure what the effective R value would be.. but that could actually cause problems by causing your HVAC to short Cycle.
And even then, it’s a minor risk which can be dealt with in a decade when the compressor eventually fails, by replacing it with a much smaller unit.
You can set the fan to whatever you want, for example, and it will manage the compressor motor, or fully auto.
I'm impressed right now the midea U shaped one is cooling with outdoor ambient below 50F.
"Bang bang control" is great.