@mir123 Basements are great if you have them. Otherwise, you have two options for air conditioning: water-based (evaporation, which only works where the ambient humidity seldom rises above about 65%) and mechanical/refrigerant. Both use electricity, but evaporation takes much less....and water, up to ten 20 liters a day. Latter takes a lot of electricity.

For years we lived in south-central British Columbia in semi-arid conditions. Summers were brutal. My dad, an engineer. sought and acquired a 'swamp cooler', a large cabinet maybe 40" on a side and about the same tall, weighing about 70 pounds with electric fan motor. Inside a drum fan much like your average furnace. Each of the four sides has a 'radiator-like' grill for air to pass through. The rear of the unit has a duct meant to be mated to your home's ducting. a small water line must be affixed to the unit at a suitable point provided on the machine and a shut-off valve for that line. Behind the grills, capoc bags are hung on small hooks so that they lie flush against the radiator-like grills showing on the exterior walls. When the unit is switched on, water runs along small channels at the inside top of the grills and drips down through the capoc bags. The fan draws air through those wetted bags and pumps it into the house, providing moistened and much cooler air. They work fabulously....but not cheap to acquire initially, and more work to install securely and to fit them well. Incidentally, the bottom tray catches the unevaporated water and a small sump pump recirculates that water up to the channels again to re-use.

In a pinch, short term, wet towels and place them in front of a fan. Seated across from that should be cool. And kewl.