We had good service from Ram services. They do both. I think you go furnace then carpets in case they make a mess. It's also good to get the ducts cleaned periodically. Ours had never been done, and it's reduced the amount of dust around the house since we got them done. It can be pricey if it's done properly, but there's less sneezing around since we've had it done.
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GO FLAMES GO!!! 
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