Is this freezer frost-free?

No. It is manual defrost with static cooling, so frost builds on the walls and shelves and you need to empty it and defrost periodically.

Can it go in a garage or unheated space?

It is freestanding and built for commercial reach-in use, so a garage or back room is a reasonable fit. Check the manual for the ambient temperature range before putting it somewhere very cold or very hot.

KoolMore rates it at 54 dB. That is noticeably louder than a typical home freezer, so it is better suited to a shop floor or utility room than an open kitchen.

Does it have an ice maker or interior light?

Neither. There is no ice maker and no interior lighting, so you will need a separate ice source and good room light to read labels.

21 cu. ft. across six wire shelves holds a large amount of boxed and bagged food, roughly a household's bulk buys plus overflow. Wire shelves keep air moving but small items can tip, so use bins.