You can bottle-carb lagers at room temp., particularly if you're using corn sugar. If, by chance, you're using a malt-based sugar, I'd carb them at primary fermentation temps (~50°F). I've done this several times with saved wort and they carbed up fine in 3 weeks.
(Why... when lager yeast ferment maltose warm, they can produce esters and other flavor-active compounds that you don't want in your lager. Dextrose/Glucose is easier for them to ferment, so there is a lower risk of producing esters when fermenting at warmer temps... or at least it's below taste threshold.)
EDIT:
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