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Mastercarpentry
Re: old dirt basement

The bulb may provide a nominal amount of heat to assist drying but with one bulb alone it would take lab-grade instrumentation to detect the difference. Just lay a vapor barrier then ventilate it and you should be fine. "Gravity ventilation" may be enough; a high air outlet to the outside and a low air inlet directly across the area. If could be manually or thermostatically closeable during winter months to save with heating. If not, continuously powering a small fan system will cost very little, less than a 100 watt bulb, and be more effective too.

Phil

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