How does artifact heat works?

[Artek [General]]

Precisely 2 questions:

1) Does it affect the chance of artifacts appearing, or the "efficiency" they have when picked up? It seems to be the latter but would be nice to have a confirmation.

2) The artifact heat seems to be random, but at the same time it seems to react to my mission prefferences. IE spamming A1 seems to have caused it go down to 34%, but might be a conincedence.

[Dj DNA]

1. it affects the efficiency
2 the more you play the same mission over and over --> the lower the heat. Play another mission and you will see the heat go back up for the previous mission and go down for the current one

[Edhellas]

100% heat means each artifact will give you 0.15 towards your booster count.
Once you finish a map, the heat for that map will be reduced, and the heat on all other maps will increase. Each artifact reduces the current map by 1.5%, and recovers other maps by 0.5%. Each time your value reaches a solid number, you gain a booster at the end of the map.

[spiken]

As a sidenote, this was added so that people don't "farm" the same map over and over. We don't want to encourage grinding.