Memorial Day, the unofficial start of summer, is also the time to make sure your air conditioners are in working order. And if you need an upgrade, consider the De'Longhi Pinguino 3-in-1 700 Sq. Ft.

Add Yahoo as a preferred source to see more of our stories on Google. Stay cool (and keep your fingers safe). (Photo: HSN) Sure, you might have central heating and cooling throughout your home, but ...