Upsizing my grow but worried about temps

Okay so I am currently growing in a 2*4 tent and will soon be upgrading to a 4x4 or 5x5 tent. The tent I currently have is inside the house so the temps are pretty easy to control ( when it's hot the AC kicks on lol) but the big tent must go into the garage (unheated and uninsulated) now I have an idea but not sure if either will be efficient.
Build a box about 2/3 the size of the tent and put a space heater in it with a fan to send warm air in when temps drop.

Any input would be great!

Lots of people grow in an unheated garage. I'm one of them. There was just a thread about it. Lot's of fluff in the thread but some good ideas as well.

https://www.rollitup.org/t/growing-in-unheated-garage.980062/

xtsho said:

Lots of people grow in an unheated garage. I'm one of them. There was just a thread about it. Lot's of fluff in the thread but some good ideas as well.

https://www.rollitup.org/t/growing-in-unheated-garage.980062/

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That's exactly what I needed. Thank you!