As spring heats up into summer, Americans all over the country over will take to their annual pilgrimage to utility supply stores to buy new air conditioning units. When it is appropriate to get a new A/C? Should you repair or clean your old one, instead? What will the investment cost, and will it be worth it? How can you calculate the best unit for your budget? And where can you find an authorized dealer who has excellent consumer ratings and good reviews from places like the Better Business Bureau?