Keep your blinds/curtains closed.
As simple as this tip may seem, Family Handyman notes that up to 30 percent of unwanted heat comes from your windows, and utilizing shades, curtains and the like can save you up to 7 percent on bills and lower indoor temperatures by up to 20 degrees. In other words, closing the blinds essentially prevents your apartment from becoming a miniature greenhouse, which is especially the case with south- and west-facing windows.
Be smart about your doors.
Closing off unused rooms will prevent cool air from permeating these areas during the hottest part of the day. You’ll want to capitalize on the cooler night hours, too, letting air flow naturally through your apartment.
Focus on the temperature in your body, not the apartment.
If your ancestors survived without air conditioning, so can you. From sipping tasty iced drinks to applying a cold cloth to strong-pulsed areas like your neck and wrists, cooling yourself from the inside out is not a bad idea. Other tricks include being smart about your clothing choices and telling your partner you won’t be cuddling until the leaves start changing color. Also try keeping a bowl of cool water by your bed and dipping your feet if you feel warm in the middle of the night.
Turn on your bathroom fans.
Or the exhaust fan in your kitchen, for that matter. Both pull the hot air that rises after you cook or take a steamy shower out of your apartment.
Let the night air in.
During summer months, temperatures may drop during the night. If this is the case where you live, make the most of these refreshing hours by cracking the windows before you go to bed. You can even create a wind tunnel by strategically setting up your fans to force the perfect cross breeze. Just be sure to close the windows and blinds before things get too hot in the morning.