[nullc]

Even above ambient, being able to reverse direction allows limiting any overshoot.

[madaxe_again]

Yeah, it occurred to me after asking that that’s likely why - with resistive heating you’re bound to have a fiddly time getting a stable temperature.

[s0rce]

If you are reasonably above ambient and the control loop is well tuned things work well, unless you are significantly perturbing the system frequently.