Indeed. But I would mention that having such a controlled environment isn't really necessary to grow either. Especially if you want to save money.
There's a very great deal of over complication in terms of growing that, to me, seems based around selling products.
You can grow great stuff just in a closet or in the corner of a room or where ever.
If there are specific circumstances that require then some products do offer that convenience or suitability but if it's not genuinely necessary, I prefer saving the cash