What's the ambient temps roughly night and day?
Do you have the light already? If not, I'd get a thouie for sure for 16 sq foot.
Then just have good air flow within the tent 24/7 then have your intake and extraction hooked up to the thermostat. A thousand watts will heat it up fast run it at night as well.
That's a bit difficult to answer. We're currently living in a shed whilst we build a house & our only source of heating is a wood heater that only gets run at night (except for weekends). At the moment, we're chucking a heap of wood into the heater & struggling to get above 14C inside.
In the depths of winter, the ambient temperature during the day won't get into double digits (we're on top of a mountain just outside Melb.) & often get snow.
No, I don't have the light yet. 'Just been doing some first-flush researching stuff today & a few questions came up in my mind....
"Thouie"? Forgive my ignorance on that one. Please enlighten me.
I considered 1000W, but it seemed a bit "overkill" for the area to be covered & not as efficient as 600W units. Given your comment that it'll heat the space quickly, I'll have a re-think on going with a more powerful installation. I'm assuming that with a unit that powerful that I'd preferably need an air-cooled hood for those times when it's not totally frigid?
BTW, thanks for everyone's advice/input. Keep it coming, please. 'Looks like I have more thinking & researching to do.