I have my laptop ...
I cut paste data from my documents to pen drive.
But now pen drive lost in bus.
I tried to recover data from local shop.
He recovered only file strucure ... but some text files coming with junk data not exact data.
Text files have important data regarding USA,Swiss...
I have both
on my personal experience .. air coolers are better ...its natural .. trees + water + fan
AC has liquid ammonia gas(artifical) .. its not good for health. You may get allergetic skin and mild headeches if u sit in AC for long time.