I don't think HVAC performance is necessarily due to how "powerful" the blower is. What is meant by power? Air velocity, pressure, volume?

Take a blower, and put a small vent on it. It might feel more powerful, but it is actually putting out less air volume.

A good HVAC system will maintain a comfortable temperature without you feeling "the breeze".

I found that my TCH did very well this summer (100 degree days) without feeling cold air being blown on me. My previous car (1995 Chevy Impala SS) will really *blow* cold air, but it struggles to keep the car cool.

Do you find that the car struggles to keep the inside warm?