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What materials to use indoors to absorb sunlight and store it as heat?

I would have insisted on Kinetic Step panels. But that might be expensive, even the installation to routing the whole house. But if DIY isn't problem perhaps. Someone could re-engineering the Kinetic ...
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What materials to use indoors to absorb sunlight and store it as heat?

The answer is very clear: since large enough quantities of phase change material with a melting point near the indoor temperatures are expensive, you want to use water. Water isn't a phase change ...
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