Electric heaters enhance comforts in large or small spaces while helping to save on energy bills. In homes and offices, they can provide spot warmth in drafty areas such as cubicles and back-end workspaces. As portable units, they move easily from room to room. Oil-filled radiator models on wheels eliminate the dangers of gas while maximizing heat distribution to chase away chills. With vintage looks, milk house units were once a mainstay of dairy barns. Today, they are practical choices for garages, basements and workshops.