The mites in the bedding if it's straw or hay. These little buggers are the likely suspects for giving you bites and your pets.
https://www.backyardchickens.com/articles/straw-itch-mite.75561/
I'm pleased you found the blowtorch tip usefull. It's all I've used in the past with wooden coops, but...
I feel for you. Many people, particularly those who have never had an infestation do not appreciate just what a disaster a mite infestation can be. Here in the UK some people just burn their coops and start again.
There are hundreds of different types of mites, many not even classified. I'm...