>Been trying to remember something I meant to try in a
>greenhouse once (but never did). The idea was that you
>filled black tubes with a compound that has a high latent
>heat (higher than water). During the day they heated up
>and then released the heat during the night to stop frosts.

I seem to remember something like this called a "nightstor heater" 'cept it
was 12 hours out of phase ;)

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