Just bought two from fortress times square. De longhi has some discounts and from looking among the range, which was pretty good , they seem to be the most energy efficient for the price. Also , we speak from personal experience, my hubby and I found that fortress offered the best in price, e Ben if not exactly the cheapest. We also bought a white Westinghouse which also came in differing capacities but had a grade 1 efficiency . It all depends on how large your apartment is for the capacity of humidifier you need.