Sort:  

Depends on how many you have, the ones in the picture I attached are in a room thats aprox 400sqft. they keep the room very warm. The Antminer's are very loud, that is more of an issue for us. We have some Eth miners which are not near as loud and give off much less heat.
We dont need to heat the space at all and its below freezing outside.

miners.PNG

I have a garage that stays at around 6 degrees Celsius but can be colder if I open the doors and windows. The noise shouldn't be too bad from in there I don't know the exact square footage either.
Do you need a lot of internet data to run those or can 300GB a month with speeds of 25MB/s be enough?

That will be fine but you should check on your rates for electricity. They take a bit of power to run all the time.
Here is a link you can play around with to see how the numbers look etc...
https://www.coinwarz.com/calculators/bitcoin-mining-calculator

My boards are running at 75-85 degree Celsius. Runs a bit hot.