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Hello all, I’m building a 6x6x5 room in my crawl space, which isn’t heated or cooled but stays cool in the summer and a little warmer than outside temperature in winter. So my plan is to insulate the room I’m building using spray foam and foam insulation board essentially creating a cooler. Then putting my 4x4x5 gorilla shortie grow tent inside the “cooler”. I’m thinking it will not be a issue keeping it cool in there during summer and should be easily heated in winter with a small heater. And since there’s a 2x2 area of space not being used by tent I should be able to draw in air air for intake and vent outside the “cooler”. Anyone think this will work? Or am I smoking way too much?

All it takes is money and effort... Good Luck!!!!

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.