I've been playing around since the big launch update changes, and I have to say I feel a bit limited when it comes to heat deletion. Let's look at the options:
AETN - These are either completely removed from the game, or just not in the asteroid type I chose. I think it's the latter based on other posts here.
Wheezewarts - As they now require a non-renewable (at least for practical purposes) resource, they aren't a long-term solution.
Steam engine - Lackluster. As far as I can tell a single aquatuner cooling water/PW still outpaces a single steam engine. Requiring two (or more with super coolant) of them per aquatuner wastes a lot of space.
Which leaves the old standby of "dump as much heat as possible into steam before releasing it to space." Is this really the only practical option when it comes to late-game cooling? Am I missing something?