[MetroMPG]

I don't suppose you have a door at the top/bottom of the stairs beween the 1st & 2nd floors.

My mom gets me to open/close the vents at their house every spring/fall:

- close all the upper vents in the fall and open the lowers (heat the lower floor/heat rises);

- open all the upper vents in the spring/summer and close the lowers (cool the upper level (AC) / cool air falls);