On Apr 9, 1:09*pm, " wrote:
Ive noticed units that are 115 v. *at high EER's (energy efficiency
ratio) *such as 10.5 but they draw higher amps . *And ive noticed 230
v. units of the same capacity at a lower EER such as 9.5 ... yet they
draw as much as half the running amps that *comparable 115 v. units
do. *Its my understanding that its amps that spin the electric meter,
so, *since i have both 115 and 230 volts available as a power source,
which *is going to use the least electricity in the example above ?
thanks.

Your electric meter is an energy meter...watt-hours (ie kilowatt-
hours)

The way I choose an window a/c unit....I get the unit that has the btu/
hour rating I'm looking for & then the best EER (relative to
price). I also consider the predicted usage....a higher EER will
reduce operating cost but that should be balanced against initial unit
cost.

Assuming both units have similar (identical) btu/hour capacities,
then the unit will use ~ 9.5% less electricity to do the same job.

If you only run the unit 30 days per year & 10 hours per day but it
costs $200 more than the 9.5 EER unit ....depending on your cost per
kilowatt-hr, the payback period could be quite a while and the
cheaper unit might make more sense.

You might save something on the order to $1 per day.

cheers
Bob