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My 3 ton geo unit uses a 30 amp breaker. That is probably more than adequate because it also is for the vertical loop pumps in the ground.

The back-up heat strips however, use a 60 amp breaker (on my system.) I'm not sure but I would say yours probably needs that too.

Good luck!

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Q: What size breaker do you need for a 3 Ton heat pump?
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