(When a complete sentence is enclosed in parentheses, place punctuation in the sentence inside the parentheses, like this.) If only part of a sentence is enclosed in parentheses (like this), place punctuation outside the parentheses (like this).
When using an abbreviation at the end of a parenthesis which also ends a sentence, you must use both periods, as odd as this may appear. For example:
The temperature was 70 to 80 degrees Fahrenheit (from min. to max.).