If you have spare rooms, and your ac unit is struggling or your billz be wildin, close your vents and doors for rooms you don’t use.
Also be sure to close blinds on rooms that are south facing
Also put foil-backed insulation over any single-paned windows you don’t use. Or do what I did and cover only half the window if you still use the room occasionally.
And if you have an HOA that bans this, placing the insulation behind the blinds instead of directly on the window will do the trick and make it difficult to see what you did, especially if you keep the blinds closed or only open them partially and angled downward.
Not closing windows, but blinds.
Closing doors only helps if you close the vents too.
And hey, there could be someone reading this thread who just moved into their first place, or moved to a hot climate for the first time.
Ah right, vents. I don’t have any. I don’t think anyone at where I live has vents in their houses ( actually, apartments)
And I just felt like it would be common sense to trap heat/cold.