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Yes, an upright piano can be too heavy for upstairs depending on the weight of the piano and the structural integrity of the upstairs. Upright pianos typically weigh between 300 to 800 pounds, making them a significant weight for upstairs areas. It is important to ensure that the upstairs has adequate floor joists and bearing capacity to support the weight of the piano. Before moving a piano upstairs, it is recommended to consult a professional piano mover or engineer to evaluate the safety and feasibility of the move.