I live in a humid climate (especially in the summer), and if we don’t refrigerate our bread and tortillas, or any baked goods, they get moldy in like 4 days.

Have you tried freezing it?

Refrigerating baked goods accelerates staleness, but most baked goods freeze well.

Freeze it every time.

If you’re anything less than a family of four, leaving bread at room temperature is just eating half a loaf of bread and then throwing away half a loaf of mouldy bread.

Most supermarket bread has indeed already been frozen before you get it.

I even freeze all the cakes from Costco, since they only seem to come in packs of about a thousand.