Marcos is correct.
We have this AC unit that uses 2000W.
I live in Boston where the avg day time high is 80F and night time is 60F.
I have the AC unit set to 77F, It uses very little energy
. I only have to drop the temp by 3 degrees for 1bout 1 hour
Someone in Las Vegas has a daytime high of 117F they have to drop the temp by 40F in the day and by 10F in the night there machine is on none stop.
There AC unit uses 100x more energy even though the units are identical.
Same with a fridge, I only open my fridge twice a day. Where as grandma have grandkids over for the summer and they live in the fridge, heck the ice even melts.
Even though, both units only use 300W, mines only chip on 2hours a day where as "grandma+grandkids" fridge is running 24x7.