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Insulating that little room as a “cooler” for your grow tent should help keep things stable, and adding that small heater for winter should do the trick.
Since crawl spaces can get stuffy, good ventilation will make a difference, especially for air exchange and humidity control. I’ve heard of others using a similar setup and even reinforcing it with some extra intake and exhaust to manage airflow better. If you ever decide to go bigger or need some ideas for a future project, places like topgradeenterprises.com offer supplies that might fit into a DIY setup like yours.

Spray foam is great insulation, but make sure you get the right type for your climate. A small heater might struggle in winter, depending on how cold it gets where you are. The air intake/exhaust plan should work, but you'll need a good fan to move enough air.

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