My line of though is:
1 - Although not the same, more frequent watering can compensate a dry environment (compensate water loss through leaves)
2 - to retain humidity around the roots a less coarse medium can be used (or sphagnum, perlite, etc, etc)
3 - a less coarse medium avoid air flow around the roots. This, together with higher temps, promotes root rot.
4 - Roots need to dry fast (not bone dry as I think Ray interpreted) so a coarse medium is best.
5 - I can't increase my HR so I must use the most suitable medium to keep, at least, humidity around the roots.
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Meteo data at my city here.
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