You need to figure out how many outlets you have on that circuit. What all is plugged in. Heaters should be plugged into the outlet by itself. never a power strip or surge protector. Alot of houses have moved onto 20amp circuits. A dyson heater, a moderm computer, and an led bulb should be fine. It's normal if the light dims. That's why they started putting the lights all on 1 circuit by themselves, but modern code forced bedroom lights to be the same as outlets.. if you have a 15 amp breaker, make sure the outlet fits tight, and don't put the heater on high.