You will definatley smell up the house with 5 plants and no filter, you could get by with one maybe two plants but not five.
Humidity plays a huge role in the smell of the weed, i’m pretty sure if you keep the humidity low - around 30%rh during flower you might keep the smell barely noticable. I’m not a 100% sure but my plant that is kept in super low humidity is barely noticable. Also genetics play a huge role, if u got a skunk strain on your hands or anything else that is super strong then it will be really noticable. Do some reading up on it. Remember that your nose gets used to the weed smell and you might not notice it, while others will smell it instantly.