I have old now with 4 built in breakers. Need new box with more breakers. What size do I need?
A good rule of thumb would be if your home is two story, definitely go with a 200A sized service.
If the home is a one story ranch, more than 1500 square feet with possibly a pool, or jacuzzi , finished basement, then a 150A sized service is best.
A 100A service is totally fine for a small ranch apartment, or condo.
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