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Just to clarify, that furnace is never going to draw anything close to 90 amps. When it's really cranking, it'll draw about 63 amps. The feeder is sized so that 63 amps is just below 80% of its ampacity (80 amps) and the breaker is the next size up.

If you were to do a load calc, the 100 amp service would probably be barely adequate, depending on the actual square footage, and the appliances that were installed.

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