^That’s a bad idea. Many weapons drain max heat, so by the time you overheat, you’ll probably have around 250 heat and 285 cooling. Later in the match, you might have 200 or less heat and be wasting 85 cooling every time you use shutdown.
It’s good to have an appropriate balance between the two, although it’s hard to say exactly what that is.
On one hand, if you have extremely high heat and low cooling, you may be able to finish most matches without overheating at all. On the other hand, once you’re getting overheated every turn, cooling is king.
The goal is to spend the least number of turns cooling down.
Although there may be times when very high heat/low cooling or moderate heat/very high cooling might be best, I’d say a 2/1 mix is a good place to start.
If you can get to 300 heat/150 cooling and you pay attention to things like how much heat your own weapons generate, and the ranges at which their highest-heating weapons will hit you, you should be able to do pretty well up to rank 2 or 3.