You usually need to grab most reality shows on the day they air because nobody seeds them after a few days. I recommend using some kind of rss feed setup, either through sonarr or with your torrent app.
Showrss.info is pretty good for beginners. It allows you to make a customized rss feed that has the shows you want in the formats you prefer. I checked and they have house hunters. This won’t help with back episodes, but at least you can start accumulating the new ones