you can use 80-85% of your breaker and thats it before its a overload.... the maxload for a 15amp breaker would be 1530 watts so if you have more than that on a 15amp breaker, its overloaded! It would be smart to use 2 different breakers for your room... its easy to do it right the first time if you do the math correctly before you even touch your breakers. volts x amps= watts so your normal 120v outlet x 15 amps is 1800 MAX WATTAGE.. Pretty much like i said, if you go over 1530watts per 15amp breaker, you could see problems.