Cooling an insulated tile?

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I made insulated tiles from a hot material and it's heating up my farms.
It seems like the tiles heat up the surroudings quickly, but their temperature decreases slowly despite wheezworts close by.
Why did the insulated tiles heat up my farms quickly, but cool down very slowly? Is it because of high mass of insulated tiles (400kg)? Or lower heat capacity of the copper ore farm (0.386 vs 1.0)?
Would it cool down faster if I deconstruct the tiles and cool down the material itself?
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Space Shuttle Thermal Tile Demonstration
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Images: Jimmy RamÃrez, murat esibatir, SHVETS production, Monstera