Never gets hot enough to need more than a fan here really, but similar ideas should still apply. Cool the person instead of the house. So I've bottle or a small heat pump (old fridge, aquarium chiller) to cool water and pipe it around you in some way.

Downside is condensation, but not sure how bad that is if you have low humidity as we are always high humidity.

You can try a swamp cooler, which works best when it's not as humid, put a beach towel or blanket over an open windown with it's end in a pot of water, so the water soaks up through it. The evaporation produces a cooling effect. Try to put one in a window the air is coming into.

Create shade wherever the sun shines, on the outside before the sun even hits the house. Focus especially on shading the glass and metall parts of your house. Make it angled and with some distance from the house so it still allows air flow. Mesh will shade less but allow more airflow and tarp will block pretty much all wind byt also pretty much all sun, so experiment with the tradeoff for different parts of the house like near windows or over the roof.

Where I live that's enough to keep me reasonably, so thats all I know. Probably need to learn more with the more extreme weather we have now.