Greetings!
To my understanding, to keep heat out you want the reflectix against to the glass to prevent it from entering at all… In the winter to keep the heat in is when you want the air gap between the reflectix and the window. Then that extra dead air space will provide extra insulation.
I rarely cover my windows myself, I prefer shade when it’s available, and if it isn’t or it’s still to hot, my swamp cooler can keep me comfortable. In the winter, I take full advantage of the sun coming in my uncovered windows, and supplement it with my heater as needed, and I still don’t cover my windows at night. I guess I really value my view, and if it takes a little extra heating or cooling to preserve my view, it’s worth it to me.
Cheers!
"Be the reason someone smiles today!" ~ Van_Dweller