Jorge, I've got a 12' by 13' shed that I keep my rodents in. I insulated the walls and roof with R-19. The floor is too low to get under it so I put 3/4in blue board insulation on top of the plywood floor and then 3/4 in. plywood on top of that for floor insulation. I have a 6500 BTU window air conditioner in the window and it keeps it at a constant 76 degrees with no problem at all, even on days it's over 100 degrees. If it's insulated right a shed/or out building is a great option. I use one of the little oil ran radiater heaters in the winter and it's very easy to keep the temps up and stable.
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Randy Whittington

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