I have a customer here in the mountains at 7,000 feet with radiant floor heating and a large grand, and it's the most stable non-DC piano I have. I suppose it depends as well on how harsh the outside climate is, and how high the radiant system is turned up. Most radiant systems have a standard furnace as an auxiliary system. --Cy-- Cy Shuster, RPT ABQ, NM www.shusterpiano.com
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