Do you have central air, and keep the fan running? I've experimented with this at our place and doing a full cycle for 5 minutes, then turning the fan to "on" r

Do you have central air, and keep the fan running? I've experimented with this at our place and doing a full cycle for 5 minutes, then turning the fan to "on" rather than "auto" and closing all doors and windows will keep it below 700 everywhere for about 6 hours. Otherwise the second floor climbs into the 1000's while the first floor stays around 500