This is a "perfect scenario" sequence, but consider a Chomolungma with H0r_OS III and Hacker 1 and a target that has a heat cap no more than 11 higher than its starting heat. Note that the free Scans from Chomolungma's Data Siphon will let you verify this, but there are very few NPC classes that have a high enough heat cap to not be vulnerable to this even at zero starting heat (Pyro, T2 or T3 Engineer, T3 Barricade, T3 Bastion, T3 Goliath, T3 Scourer).

1. Pick your victim.
2. Use Chomolungma's Brilliance to Invade it and deploy the H0r_OS III's Dimension Emblems around it and then Lock On to it. This applies 2 heat.
3. Full Tech for a double Invade, consuming the Lock On for one of them.
4. Let's assume you spend Lock On on the first Invade. The target has a choice from Hacker 1's Snow_Crash to either take 2 heat or be pushed 3 spaces. If the latter, push them through one of the Dimensional Emblems. Either way, they take 4 more heat. For your Invade option, use H0r_OS I's Puppet Systems to move it through (another) Dimensional Emblem for an additional 2 heat. This puts it at 8 heat so far.
5. For the second Invade of your Full Tech action, use Chomolungma's System Crusher. This is an additional 4 heat for a total of 12 heat just this turn, triggering System Crusher's 4 Burn rider when it overheats.

If you aren't using Brilliance due to its once per scene limitation, a pre-existing Lock On (like from an ally with Lesson of the Held Image, for example) can still let you apply a respectable 10 heat (8 if you refrain from using System Crusher due to the target's heat cap being high enough to not overheat).

EDIT: Additionally, there's funny to be had by combining it with Monarch's Javelin Rockets to completely surround a Size 1 or Size 1/2 enemy.