Should be switching the low side with an n-channel mosfet

somehow I got this wrong again even after making the same mistake when
breadboarding the circuit

README

@@ -7,4 +7,4 @@ VR1 to read 1.75V sets the hold/max temperature to within 1 degree C of 25C
 the power mosfet is an IRF530N, and as wired, max input and load of the circuit
 is 20V and around 5A.
 
-RV2 can be adjusted to change the lower threshold of the schmidtt trigger.
+RV2 can be adjusted to change the lower threshold of the schmitt trigger.

proof_box_controller.kicad_sch

@@ -2642,6 +2642,12 @@
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@@ -4253,7 +4253,7 @@
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