SEER factor for overall energy efficency. most companies sell a variety
of SEER efficencys. years ago a 8 was very good. Now I hear 12 is norm,
up to 20 for a super high efficency unit.

the higher the seer the more the energy savings, but upfront cost can
be brutal. super high seer might be worth it in southern florida, but
marginal at best in maine, where the number of AC days is low.

its always good to check the energy labels on appliances