How does heat math works? Are heat exchangers additive or multiplicative or something else?

Solution 1:

Heat exchangers are multiplicative. If you have 2 ++exchangers (20% reduced heat each), your total heat output will be 0.8^2 = 64% of the original. Note that:

  • How BT rounds numbers may be wonky.
  • The heat bar isn't a very good indication of your mech's true efficiency. However, if you hover your mouse over it, the tooltip figures should be accurate.