Summer is right around the corner, and the temperatures inside your house will soon be rising. Unfortunately, the mere thought of searching for a HVAC company to install an air conditioning unit is enough to have you sweating from head to toe. How do you figure out which one to buy, and what effect will it impose on your energy bill? What if you live in an apartment that does not allow window units? Worry no more: We have done all the research for your benefit.