Walmart is selling a 'powerful' $860 window air conditioner for only $470, and it's known to be 'very efficient'

TheStreet aims to feature only the best products and services. If you buy something via one of our links, we may earn a commission. When sweltering summer heat turns your home into a sauna, relaxing indoors, let alone sleeping, is nearly impossible. If a tower fan just won't cut it, a powerful…