diff --git a/code/__DEFINES/atmospherics.dm b/code/__DEFINES/atmospherics.dm
index eb3c71dec0..ab12e53bcf 100644
--- a/code/__DEFINES/atmospherics.dm
+++ b/code/__DEFINES/atmospherics.dm
@@ -74,6 +74,8 @@
 #define SYNTH_SINGLE_INFLUENCE_COOLING_EFFECT_CAP 3		//How big can the multiplier for heat / pressure cooling be in an optimal environment
 #define SYNTH_TOTAL_ENVIRONMENT_EFFECT_CAP 2			//How big of an multiplier can the environment give in an optimal scenario (maximum efficiency in the end is 1, this just counters low coolant levels)
 #define SYNTH_ACTIVE_COOLING_TEMP_BOUNDARY 10			//The minimum distance from room temperature a Synth needs to have for active cooling to actively cool.
+#define SYNTH_ACTIVE_COOLING_LOW_PRESSURE_THRESHOLD 0.05	//At how much percentage of default pressure (or lower) active cooling gets a massive cost penalty.
+#define SYNTH_ACTIVE_COOLING_LOW_PRESSURE_PENALTY 2.5		//By how much is active cooling cost multiplied if in a very-low-pressure environment?
 
 #define BODYTEMP_NORMAL						310.15			//The natural temperature for a body
 #define BODYTEMP_AUTORECOVERY_DIVISOR		11		//This is the divisor which handles how much of the temperature difference between the current body temperature and 310.15K (optimal temperature) humans auto-regenerate each tick. The higher the number, the slower the recovery. This is applied each tick, so long as the mob is alive.
diff --git a/code/_onclick/hud/hud.dm b/code/_onclick/hud/hud.dm
index 36a3cd1f1a..144a38e728 100644
--- a/code/_onclick/hud/hud.dm
+++ b/code/_onclick/hud/hud.dm
@@ -35,6 +35,8 @@ GLOBAL_LIST_INIT(available_ui_styles, list(
 
 	var/atom/movable/screen/devil/soul_counter/devilsouldisplay
 
+	var/atom/movable/screen/synth/coolant_counter/coolant_display
+
 	var/atom/movable/screen/action_intent
 	var/atom/movable/screen/zone_select
 	var/atom/movable/screen/pull_icon
diff --git a/code/_onclick/hud/human.dm b/code/_onclick/hud/human.dm
index e4a9dc24e8..d8d44690f2 100644
--- a/code/_onclick/hud/human.dm
+++ b/code/_onclick/hud/human.dm
@@ -80,6 +80,59 @@
 	icon_state = "power_display"
 	screen_loc = ui_lingchemdisplay
 
+#define ui_coolant_display "EAST,SOUTH+3:15"
+
+/atom/movable/screen/synth
+	invisibility = INVISIBILITY_ABSTRACT
+
+
+/atom/movable/screen/synth/proc/clear()
+	invisibility = INVISIBILITY_ABSTRACT
+
+/atom/movable/screen/synth/proc/update_counter(value, mob/living/carbon/human/owner)
+	invisibility = 0
+
+/atom/movable/screen/synth/coolant_counter
+	icon = 'icons/mob/screen_synth.dmi'
+	name = "Coolant System Readout"
+	icon_state = "coolant-3"
+	screen_loc = ui_coolant_display
+
+/atom/movable/screen/synth/coolant_counter/update_counter(value, mob/living/carbon/owner)
+	..()
+	var/valuecolor = "#FF6666"
+	if(owner.stat == DEAD)
+		maptext = "<div align='center' valign='middle' style='position:relative; top:0px; left:6px'><font color='[valuecolor]'>ERR-0F</font></div>"
+		icon_state = "coolant-3"
+		return
+	if(owner.blood_volume > BLOOD_VOLUME_SAFE * owner.blood_ratio)
+		valuecolor =  "#FFDDDD"
+	else if(owner.blood_volume > BLOOD_VOLUME_BAD * owner.blood_ratio)
+		valuecolor =  "#FFAAAA"
+	maptext = "<div align='center' valign='middle' style='position:relative; top:0px; left:6px'><font color='[valuecolor]'>[round(value,1)]</font></div>"
+
+	var/coolant_efficiency = owner.get_cooling_efficiency()
+	switch(coolant_efficiency)
+		if(-INFINITY to 0.4)
+			icon_state = "coolant-1"
+		if(0.4 to 0.75)
+			icon_state = "coolant-2"
+		if(0.75 to 0.95)
+			icon_state = "coolant-3"
+		if(0.95 to 1.3)
+			icon_state = "coolant-4"
+		else
+			icon_state = "coolant-5"
+
+/atom/movable/screen/synth/coolant_counter/examine(mob/user)
+	. = ..()
+	var/mob/living/carbon/human/owner = hud.mymob
+	if(owner.stat == DEAD)
+		return
+	. += "<span class='notice'>Performing internal cooling system diagnostics:</span>"
+	. += "<span class='notice'>Coolant level: [owner.blood_volume] units, [round((owner.blood_volume / (BLOOD_VOLUME_NORMAL * owner.blood_ratio)) * 100, 0.1)] percent</span>"
+	. += "<span class='notice'>Current Cooling Efficiency: [round(owner.get_cooling_efficiency() * 100, 0.1)] percent, environment viability: [round(owner.get_environment_cooling_efficiency() * 100, 0.1)] percent.</span>"
+
 /datum/hud/human/New(mob/living/carbon/human/owner)
 	..()
 	owner.overlay_fullscreen("see_through_darkness", /atom/movable/screen/fullscreen/see_through_darkness)
@@ -359,6 +412,10 @@
 	sunlight_display.hud = src
 	infodisplay += sunlight_display
 
+	coolant_display = new /atom/movable/screen/synth/coolant_counter	//Coolant & cooling efficiency readouts for Synths.
+	coolant_display.hud = src
+	infodisplay += coolant_display
+
 	zone_select =  new /atom/movable/screen/zone_sel()
 	zone_select.icon = ui_style
 	zone_select.hud = src
diff --git a/code/modules/mob/living/carbon/human/examine.dm b/code/modules/mob/living/carbon/human/examine.dm
index 0e75595c75..c3fb82de36 100644
--- a/code/modules/mob/living/carbon/human/examine.dm
+++ b/code/modules/mob/living/carbon/human/examine.dm
@@ -249,16 +249,17 @@
 		if(DISGUST_LEVEL_DISGUSTED to INFINITY)
 			msg += "[t_He] look[p_s()] extremely disgusted.\n"
 
-	var/apparent_blood_volume = blood_volume
-	if(dna.species.use_skintones && skin_tone == "albino")
-		apparent_blood_volume -= 150 // enough to knock you down one tier
-	switch(apparent_blood_volume)
-		if(BLOOD_VOLUME_OKAY to BLOOD_VOLUME_SAFE)
-			msg += "[t_He] [t_has] pale skin.\n"
-		if(BLOOD_VOLUME_BAD to BLOOD_VOLUME_OKAY)
-			msg += "<b>[t_He] look[p_s()] like pale death.</b>\n"
-		if(-INFINITY to BLOOD_VOLUME_BAD)
-			msg += "<span class='deadsay'><b>[t_He] resemble[p_s()] a crushed, empty juice pouch.</b></span>\n"
+	if(!HAS_TRAIT(src, TRAIT_ROBOTIC_ORGANISM))
+		var/apparent_blood_volume = blood_volume
+		if(dna.species.use_skintones && skin_tone == "albino")
+			apparent_blood_volume -= 150 // enough to knock you down one tier
+		switch(apparent_blood_volume)
+			if(BLOOD_VOLUME_OKAY to BLOOD_VOLUME_SAFE)
+				msg += "[t_He] [t_has] pale skin.\n"
+			if(BLOOD_VOLUME_BAD to BLOOD_VOLUME_OKAY)
+				msg += "<b>[t_He] look[p_s()] like pale death.</b>\n"
+			if(-INFINITY to BLOOD_VOLUME_BAD)
+				msg += "<span class='deadsay'><b>[t_He] resemble[p_s()] a crushed, empty juice pouch.</b></span>\n"
 
 	if(bleedsuppress)
 		msg += "[t_He] [t_is] embued with a power that defies bleeding.\n" // only statues and highlander sword can cause this so whatever
diff --git a/code/modules/mob/living/carbon/human/life.dm b/code/modules/mob/living/carbon/human/life.dm
index 4cfc230075..1c73a4bd37 100644
--- a/code/modules/mob/living/carbon/human/life.dm
+++ b/code/modules/mob/living/carbon/human/life.dm
@@ -30,6 +30,8 @@
 /mob/living/carbon/human/PhysicalLife(seconds, times_fired)
 	if(!(. = ..()))
 		return
+	if(HAS_TRAIT(src, TRAIT_ROBOTIC_ORGANISM) && hud_used)
+		hud_used.coolant_display.update_counter(blood_volume, src)
 	//Update our name based on whether our face is obscured/disfigured
 	name = get_visible_name()
 
diff --git a/code/modules/mob/living/carbon/human/species.dm b/code/modules/mob/living/carbon/human/species.dm
index 27c8b289e5..4f26907eff 100644
--- a/code/modules/mob/living/carbon/human/species.dm
+++ b/code/modules/mob/living/carbon/human/species.dm
@@ -574,6 +574,9 @@ GLOBAL_LIST_EMPTY(roundstart_race_names)
 		for(var/obj/item/bodypart/B in C.bodyparts)
 			B.change_bodypart_status(initial(B.status), FALSE, TRUE)
 
+	if((TRAIT_ROBOTIC_ORGANISM in inherent_traits) && C.hud_used)
+		C.hud_used.coolant_display.clear()
+
 	SEND_SIGNAL(C, COMSIG_SPECIES_LOSS, src)
 
 // shamelessly inspired by antag_datum.remove_blacklisted_quirks()
diff --git a/code/modules/surgery/organs/lungs.dm b/code/modules/surgery/organs/lungs.dm
index 6d61ccf085..8cedaf2f9e 100644
--- a/code/modules/surgery/organs/lungs.dm
+++ b/code/modules/surgery/organs/lungs.dm
@@ -484,9 +484,12 @@
 	var/actual_drain = cooling_coolant_drain * max(1 - cooling_efficiency, 0.2)	//Being in a suitable environment reduces drain by up to 80%
 	var/temp_diff = owner.bodytemperature - T20C
 	if(temp_diff > 0)
-		owner.adjust_bodytemperature(min(((T20C - owner.bodytemperature) * max(cooling_efficiency, 0.2) / BODYTEMP_COLD_DIVISOR), BODYTEMP_COOLING_MAX))
+		owner.adjust_bodytemperature(max(((T0C - owner.bodytemperature) * max(cooling_efficiency, 0.5) / BODYTEMP_COLD_DIVISOR), BODYTEMP_COOLING_MAX))
 	else
-		owner.adjust_bodytemperature(min(((T20C - owner.bodytemperature) * max(cooling_efficiency, 0.2) / BODYTEMP_HEAT_DIVISOR), BODYTEMP_HEATING_MAX))
+		owner.adjust_bodytemperature(min(((T20C - owner.bodytemperature) * max(cooling_efficiency, 0.5) / BODYTEMP_HEAT_DIVISOR), BODYTEMP_HEATING_MAX))
+	var/datum/gas_mixture/air = owner.loc.return_air()
+	if(!air || air.return_pressure() < ONE_ATMOSPHERE * SYNTH_ACTIVE_COOLING_LOW_PRESSURE_THRESHOLD)
+		actual_drain *= SYNTH_ACTIVE_COOLING_LOW_PRESSURE_PENALTY	//Our cooling system can handle hot places okayish, but starts to cry at low pressures (reads: Effectively vents hot coolant thats been warmed up via internal heat-exchange as emergency measure and with very low efficiency)
 	owner.blood_volume = max(owner.blood_volume - actual_drain, 0)
 	if(owner.blood_volume <= next_warn)
 		to_chat(owner, "[owner.blood_volume > BLOOD_VOLUME_BAD ? "<span class='notice'>" : "<span class='warning'>"]Coolant level passed threshold - now [round(owner.blood_volume / BLOOD_VOLUME_NORMAL * 100, 0.1)] percent.</span>")
diff --git a/icons/mob/screen_synth.dmi b/icons/mob/screen_synth.dmi
new file mode 100644
index 0000000000..6c3e6b3e79
Binary files /dev/null and b/icons/mob/screen_synth.dmi differ