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Yeah they do get really hot/cold depending on the season.Also the containers that get sold off do so because they have hit the end of their service life ie:rust etc.
If you did go that way then you would probably need to build a false roof out of polycarb etc to stop leaks as the roofs do tend to rust right thru in 12 to 18 months.
Also while 20ft long they aint that wide at 8ft.
Cost wise for construction,a timber framed shed with fibro outside,lined with ply on the inside and insulated with fibreglass batts(walls and ceiling) would be the most economical.Plus the fact you can build to a size that more suits your needs.
I used this type of setup for my fish room(cichlids) and heated the entire room and it worked very well.
Hope this helps.
cheers
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