(StatePoint) With scorching summer temperatures here, a cautionary tale unfolds for those in search of a portable AC unit to beat the heat. Enticing promises and clever marketing tactics make it easy to fall prey to the pitfalls that await unsuspecting buyers. Here’s how to be a savvy shopper:

• Ratings: Be aware that a higher advertised BTU rating doesn’t always guarantee a cooler paradise. Crafty sellers may advertise more BTUs than the product’s actual performance, but buyers beware. The truth lies in making sure you are matching the Department of Energy’s (DOE) BTU rating to your room’s square footage according to the DOE guidelines. When shopping online or in-store, be sure to check the fine print for the certified DOE rated BTU level for correct coverage – and if you don’t see this information listed, stay away! A free online BTU calculator can help you choose wisely.