diff --git a/Marlin/src/lcd/e3v2/jyersui/dwin.cpp b/Marlin/src/lcd/e3v2/jyersui/dwin.cpp
index cf0d6dc8fccc..0f78e58ef5d7 100644
--- a/Marlin/src/lcd/e3v2/jyersui/dwin.cpp
+++ b/Marlin/src/lcd/e3v2/jyersui/dwin.cpp
@@ -1213,7 +1213,7 @@ void CrealityDWINClass::Menu_Item_Handler(uint8_t menu, uint8_t item, bool draw/
                 if (thermalManager.temp_hotend[0].target < thermalManager.extrude_min_temp)
                   Popup_Handler(ETemp);
                 else {
-                  if (thermalManager.temp_hotend[0].is_below_target(-2)) {
+                  if (thermalManager.temp_hotend[0].is_below_target(2)) {
                     Popup_Handler(Heating);
                     thermalManager.wait_for_hotend(0);
                   }
@@ -1356,7 +1356,7 @@ void CrealityDWINClass::Menu_Item_Handler(uint8_t menu, uint8_t item, bool draw/
                 Popup_Handler(ETemp);
               }
               else {
-                if (thermalManager.temp_hotend[0].is_below_target(-2)) {
+                if (thermalManager.temp_hotend[0].is_below_target(2)) {
                   Popup_Handler(Heating);
                   thermalManager.wait_for_hotend(0);
                   Redraw_Menu();
@@ -1743,7 +1743,7 @@ void CrealityDWINClass::Menu_Item_Handler(uint8_t menu, uint8_t item, bool draw/
               if (thermalManager.temp_hotend[0].target < thermalManager.extrude_min_temp)
                 Popup_Handler(ETemp);
               else {
-                if (thermalManager.temp_hotend[0].is_below_target(-2)) {
+                if (thermalManager.temp_hotend[0].is_below_target(2)) {
                   Popup_Handler(Heating);
                   thermalManager.wait_for_hotend(0);
                 }
@@ -1762,7 +1762,7 @@ void CrealityDWINClass::Menu_Item_Handler(uint8_t menu, uint8_t item, bool draw/
                 Popup_Handler(ETemp);
               }
               else {
-                if (thermalManager.temp_hotend[0].is_below_target(-2)) {
+                if (thermalManager.temp_hotend[0].is_below_target(2)) {
                   Popup_Handler(Heating);
                   thermalManager.wait_for_hotend(0);
                 }
@@ -1780,7 +1780,7 @@ void CrealityDWINClass::Menu_Item_Handler(uint8_t menu, uint8_t item, bool draw/
               if (thermalManager.temp_hotend[0].target < thermalManager.extrude_min_temp)
                 Popup_Handler(ETemp);
               else {
-                if (thermalManager.temp_hotend[0].is_below_target(-2)) {
+                if (thermalManager.temp_hotend[0].is_below_target(2)) {
                   Popup_Handler(Heating);
                   thermalManager.wait_for_hotend(0);
                 }
@@ -4505,7 +4505,7 @@ void CrealityDWINClass::Popup_Control() {
             if (thermalManager.temp_hotend[0].target < thermalManager.extrude_min_temp)
               Popup_Handler(ETemp);
             else {
-              if (thermalManager.temp_hotend[0].is_below_target(-2)) {
+              if (thermalManager.temp_hotend[0].is_below_target(2)) {
                 Popup_Handler(Heating);
                 thermalManager.wait_for_hotend(0);
               }
diff --git a/Marlin/src/module/temperature.cpp b/Marlin/src/module/temperature.cpp
index ead7e97a8106..cd76dac326cf 100644
--- a/Marlin/src/module/temperature.cpp
+++ b/Marlin/src/module/temperature.cpp
@@ -1599,22 +1599,25 @@ void Temperature::mintemp_error(const heater_id_t heater_id) {
       #endif
 
       #if HEATER_IDLE_HANDLER
-        if (heater_idle[IDLE_INDEX_BED].timed_out) {
+        const bool bed_timed_out = heater_idle[IDLE_INDEX_BED].timed_out;
+        if (bed_timed_out) {
           temp_bed.soft_pwm_amount = 0;
           if (DISABLED(PIDTEMPBED)) WRITE_HEATER_BED(LOW);
         }
-        else
+      #else
+        constexpr bool bed_timed_out = false;
       #endif
-      {
+
+      if (!bed_timed_out) {
         #if ENABLED(PIDTEMPBED)
           temp_bed.soft_pwm_amount = WITHIN(temp_bed.celsius, BED_MINTEMP, BED_MAXTEMP) ? (int)get_pid_output_bed() >> 1 : 0;
         #else
           // Check if temperature is within the correct band
           if (WITHIN(temp_bed.celsius, BED_MINTEMP, BED_MAXTEMP)) {
             #if ENABLED(BED_LIMIT_SWITCHING)
-              if (temp_bed.celsius >= temp_bed.target + BED_HYSTERESIS)
+              if (temp_bed.is_above_target((BED_HYSTERESIS) - 1))
                 temp_bed.soft_pwm_amount = 0;
-              else if (temp_bed.is_below_target(-(BED_HYSTERESIS) + 1))
+              else if (temp_bed.is_below_target((BED_HYSTERESIS) - 1))
                 temp_bed.soft_pwm_amount = MAX_BED_POWER >> 1;
             #else // !PIDTEMPBED && !BED_LIMIT_SWITCHING
               temp_bed.soft_pwm_amount = temp_bed.is_below_target() ? MAX_BED_POWER >> 1 : 0;
@@ -1641,7 +1644,7 @@ void Temperature::mintemp_error(const heater_id_t heater_id) {
     #endif
 
     #if ENABLED(THERMAL_PROTECTION_CHAMBER)
-      if (degChamber() > CHAMBER_MAXTEMP) maxtemp_error(H_CHAMBER);
+      if (degChamber() > (CHAMBER_MAXTEMP)) maxtemp_error(H_CHAMBER);
     #endif
 
     #if WATCH_CHAMBER
@@ -1669,13 +1672,12 @@ void Temperature::mintemp_error(const heater_id_t heater_id) {
           #if CHAMBER_FAN_MODE == 0
             fan_chamber_pwm = CHAMBER_FAN_BASE;
           #elif CHAMBER_FAN_MODE == 1
-            fan_chamber_pwm = (temp_chamber.celsius > temp_chamber.target) ? (CHAMBER_FAN_BASE) + (CHAMBER_FAN_FACTOR) * (temp_chamber.celsius - temp_chamber.target) : 0;
+            fan_chamber_pwm = temp_chamber.is_above_target() ? (CHAMBER_FAN_BASE) + (CHAMBER_FAN_FACTOR) * (temp_chamber.celsius - temp_chamber.target) : 0;
           #elif CHAMBER_FAN_MODE == 2
             fan_chamber_pwm = (CHAMBER_FAN_BASE) + (CHAMBER_FAN_FACTOR) * ABS(temp_chamber.celsius - temp_chamber.target);
-            if (temp_chamber.soft_pwm_amount)
-              fan_chamber_pwm += (CHAMBER_FAN_FACTOR) * 2;
+            if (temp_chamber.soft_pwm_amount) fan_chamber_pwm += (CHAMBER_FAN_FACTOR) * 2;
           #elif CHAMBER_FAN_MODE == 3
-            fan_chamber_pwm = CHAMBER_FAN_BASE + _MAX((CHAMBER_FAN_FACTOR) * (temp_chamber.celsius - temp_chamber.target), 0);
+            fan_chamber_pwm = (CHAMBER_FAN_BASE) + _MAX((CHAMBER_FAN_FACTOR) * (temp_chamber.celsius - temp_chamber.target), 0);
           #endif
           NOMORE(fan_chamber_pwm, 255);
           set_fan_speed(CHAMBER_FAN_INDEX, fan_chamber_pwm);
@@ -1688,7 +1690,7 @@ void Temperature::mintemp_error(const heater_id_t heater_id) {
           #ifndef MIN_COOLING_SLOPE_DEG_CHAMBER_VENT
             #define MIN_COOLING_SLOPE_DEG_CHAMBER_VENT 1.5
           #endif
-          if (!flag_chamber_excess_heat && temp_chamber.celsius - temp_chamber.target >= HIGH_EXCESS_HEAT_LIMIT) {
+          if (!flag_chamber_excess_heat && temp_chamber.is_above_target((HIGH_EXCESS_HEAT_LIMIT) - 1)) {
             // Open vent after MIN_COOLING_SLOPE_TIME_CHAMBER_VENT seconds if the
             // temperature didn't drop at least MIN_COOLING_SLOPE_DEG_CHAMBER_VENT
             if (next_cool_check_ms_2 == 0 || ELAPSED(ms, next_cool_check_ms_2)) {
@@ -1702,7 +1704,7 @@ void Temperature::mintemp_error(const heater_id_t heater_id) {
             next_cool_check_ms_2 = 0;
             old_temp = 9999;
           }
-          if (flag_chamber_excess_heat && (temp_chamber.target - temp_chamber.celsius >= LOW_EXCESS_HEAT_LIMIT))
+          if (flag_chamber_excess_heat && temp_chamber.is_above_target((LOW_EXCESS_HEAT_LIMIT) - 1))
             flag_chamber_excess_heat = false;
         #endif
       }
@@ -1734,9 +1736,9 @@ void Temperature::mintemp_error(const heater_id_t heater_id) {
           }
           else {
             #if ENABLED(CHAMBER_LIMIT_SWITCHING)
-              if (temp_chamber.celsius >= temp_chamber.target + TEMP_CHAMBER_HYSTERESIS)
+              if (temp_chamber.is_above_target((TEMP_CHAMBER_HYSTERESIS) - 1))
                 temp_chamber.soft_pwm_amount = 0;
-              else if (temp_chamber.is_below_target(-(TEMP_CHAMBER_HYSTERESIS) + 1))
+              else if (temp_chamber.is_below_target((TEMP_CHAMBER_HYSTERESIS) - 1))
                 temp_chamber.soft_pwm_amount = (MAX_CHAMBER_POWER) >> 1;
             #else
               temp_chamber.soft_pwm_amount = temp_chamber.is_below_target() ? (MAX_CHAMBER_POWER) >> 1 : 0;
@@ -1788,20 +1790,18 @@ void Temperature::mintemp_error(const heater_id_t heater_id) {
       if (temp_cooler.target == 0) temp_cooler.target = COOLER_MIN_TARGET;
       if (ELAPSED(ms, next_cooler_check_ms)) {
         next_cooler_check_ms = ms + COOLER_CHECK_INTERVAL;
-        if (temp_cooler.celsius > temp_cooler.target) {
-          temp_cooler.soft_pwm_amount = temp_cooler.celsius > temp_cooler.target ? MAX_COOLER_POWER : 0;
-          flag_cooler_state = temp_cooler.soft_pwm_amount > 0 ? true : false; // used to allow M106 fan control when cooler is disabled
+        if (temp_cooler.is_above_target()) { // too warm?
+          temp_cooler.soft_pwm_amount = MAX_COOLER_POWER;
           #if ENABLED(COOLER_FAN)
-            int16_t fan_cooler_pwm = (COOLER_FAN_BASE) + (COOLER_FAN_FACTOR) * ABS(temp_cooler.celsius - temp_cooler.target);
-            NOMORE(fan_cooler_pwm, 255);
-            set_fan_speed(COOLER_FAN_INDEX, fan_cooler_pwm); // Set cooler fan pwm
+            const int16_t fan_cooler_pwm = (COOLER_FAN_BASE) + (COOLER_FAN_FACTOR) * ABS(temp_cooler.celsius - temp_cooler.target);
+            set_fan_speed(COOLER_FAN_INDEX, _MIN(fan_cooler_pwm, 255)); // Set cooler fan pwm
             cooler_fan_flush_ms = ms + 5000;
           #endif
         }
         else {
           temp_cooler.soft_pwm_amount = 0;
           #if ENABLED(COOLER_FAN)
-            set_fan_speed(COOLER_FAN_INDEX, temp_cooler.celsius > temp_cooler.target - 2 ? COOLER_FAN_BASE : 0);
+            set_fan_speed(COOLER_FAN_INDEX, temp_cooler.is_above_target(-2) ? COOLER_FAN_BASE : 0);
           #endif
           WRITE_HEATER_COOLER(LOW);
         }
diff --git a/Marlin/src/module/temperature.h b/Marlin/src/module/temperature.h
index 11b2530d38d5..091f218eb837 100644
--- a/Marlin/src/module/temperature.h
+++ b/Marlin/src/module/temperature.h
@@ -421,7 +421,8 @@ typedef struct TempInfo {
 typedef struct HeaterInfo : public TempInfo {
   celsius_t target;
   uint8_t soft_pwm_amount;
-  bool is_below_target(const celsius_t offs=0) const { return (celsius < (target + offs)); }
+  bool is_below_target(const celsius_t offs=0) const { return (target - celsius > offs); } // celsius < target - offs
+  bool is_above_target(const celsius_t offs=0) const { return (celsius - target > offs); } // celsius > target + offs
 } heater_info_t;
 
 // A heater with PID stabilization