Obviously, from the point of view of efficiency, the higher the EER the better, but a higher EER is tyically accompanied by a higher price. Consider two 12,000-BtuBtu air conditioners, one with an EER of 7.8 and the other with an EER of 10. The difference in price is about 70 dollarsdollars. Assuming that the air conditioner will be operated for 6 hours daily during a period of 4 months every year, how long will it take to break even financially if you purchase the more expensive unit? Take the cost of electricity to be 0.10 dollar/(kilowatt⋅hour)dollar/(kilow att⋅hour).