Ceiling fans act like a lullaby, whispering white noise while creating a gentle breeze to keep your body cool. And, since they're cheaper to operate than an air conditioner, you won't lie awake fretting over your electric bills. Allergy sufferers should look for a model whose blades are coated with nanoparticles to prevent dust buildup, such as those from The Hunter Fan Company. From $119
Get step-by-step instructions at How to Install a Ceiling Fan.