NMoasis said: 
Garduri
Lucy's advice is sound. However, I'm curious: what larvae and pathogens are you concerned about? Were your previous potted plants diseased or infested? What did you grow previously and what do you intend to plant now?
How does the humidity affect your potting soil?
What issues are you having?
One "non-house" stinkyness idea I've tried is using an outdoor grill, with thermometer, using disposable aluminum pans you might use for a roast or turkey- but if you have a lot- I don't see heating as a real option.
I only 'pasteurize' on rare occasions- I.E. seed starting mix when sprouting EXPENSIVE seed.
I often saturate my seed flat soil with boiling water, let cool, then plant.
Again- I'm trying to avoid dampening off fungus and fungus gnats- not achieve total sterilization.
This may help:
https://extension.psu.edu/how-...
