Now that summer is in full swing, the best air conditioners on Amazon are helpful home appliances to install in a pinch. After all, no one wants to spend the day sweaty or toss through the night because the air feels thick with heat.

To keep our guide to the best smart window air conditioners up to date, I've been testing window air conditioners for the past five years. Not only have they been keeping my house cool, but they've also been saving me money, as they're a lot more efficient than older models.

Who qualifies: All residential customers with active accounts are eligible for up to $125 off an Energy Star-rated window or through-the-wall unit. However, some customers who are enrolled in certain savings programs for lower-income customers or seniors could be eligible for up to $275 off a window, wall or portable unit.