Best options to balance air temp in a 2 story house
Hi, I'm new to Canadian houses and ducted air con. My basement is freezing, my upstairs is stuffy. How can I best balance the air flow. Google says:
Close lower floor vents to increase air pressure upwards.
Ensure return air vents are unobstructed (no furniture or coverings) - to suck the hot air away.
Fan air in the stairwell to help direct hot air.
Is there anything else, or has anyone got any tips on how to really close off air vents, as even the closed ones still have some air coming out. I'm thinking of cutting some foam to block them better?