I ordered these space heaters because I am back on the cold East Coast and my 1st electric bill was through the roof! I ordered the 2-pack so me and my daughter would have one in each of our rooms. These small heaters really put out some heat - my room is about 20x20 and one of these heaters warmed it up in about 30 minutes. When our temps hit below zero, these heaters and electric blankets kept us warm at night with no problems. I am able to check my daily usage of electric online and when I switched from using my central heating unit to these space heaters, I am saving some serious money. For example: on Dec. 3, it cost me $15 when I ran my electric furnace most of the day. On Jan. 1st, my daughter and I was home, ran these small heaters all day and my total electrical usage cost me $3.25 for the day. Ive had no mechanical problems since buying them, they were shipped promptly and the cost was right - about $11 for each heater. I would recommend these units for winter savings.