FA-92604 / HVAC thermostat control / Member archive

Overcooling offset is not limited · case 04

Very humid days drive the cooling setpoint several degrees below what the user set.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Thermostat humidity functions per sample; samples are [temp tenths F, indoor RH %, outdoor whole F]. Dehumidify-by-overcooling turns on when RH > rh_sp + 5 and off when RH <= rh_sp; while on, the effective cooling setpoint is lowered by min(max_overcool, (RH - rh_sp) * 5) tenths. Cooling starts above effective + 1.0 F and ends at <= effective. Humidifier: allowed RH = 40 + floor((outdoor - 20) / 10) * 5 clamped to 15..45; target = min(hum_sp, allowed); it is off when outdoor >= 50, otherwise starts below target - 3 and stops at >= target. Return [cooling, effective_sp, humidifier].

Why this case matters

Residential and light-commercial thermostats make these decisions sample by sample; each defect changes equipment calls in a way that shows up as short cycling, comfort complaints or equipment stress.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression: scenario 10	`[[false, 750, false], [true, 715, false], [true, 685, false], [true, 695, false], [true, 680, false], [true, 670, false], [true, 675, false], [true, 645, false], [true, 645, false], [true, 655, false], [true, 650, false], [true, 630, false], [true, 625, false], [true, 655, false]]`	`[[false, 750, false], [true, 730, false], [true, 730, false], [true, 730, false], [true, 730, false], [true, 730, false], [true, 730, false], [true, 730, false], [true, 730, false], [true, 730, false], [true, 730, false], [true, 730, false], [true, 730, false], [true, 730, false]]`	Failed

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