I've already seen one for Kohl's with a Christmas theme and one for Glade scented candles.
They started last month.You have answered your own question. They have started already.
HGTV knows who their target audience is.Over the weekend I saw a Christmas ad on HGTV run ad-nauseam from Hobby Lobby. The first time I saw it, it made me get a bit misty-eyed. After about the 3rd time it aired within an hour, it just got old. While I won't got into to much detail, let's just say it's a made up story to tug at the heartstrings, much like the dreadful song "Christmas Shoes".