Makes the clamp not allow deleting or creating energy.

maplestation_modules/code/modules/magic/story_spells/convect.dm

@@ -43,9 +43,7 @@
 	spell_requirements = SPELL_REQUIRES_NO_ANTIMAGIC
 
 	var/temperature_for_cast = 25
-	//Minimum temperature able to be chosen when casting
-	var/minimum_temperature_delta = -50
-	//Maximum temperature able to be chosen when casting
+	//Maximum temperature change able to be chosen when casting
 	var/maximum_temperature_delta = 50
 	//Minimum temperature the spell can reach
 	var/minimum_temperature_atmos = T0C - 50
@@ -69,7 +67,7 @@
 
 /// Asks the owner for a number via TGUI. If the number isn't 0 or null, sets it to our temperature.
 /datum/action/cooldown/spell/pointed/convect/proc/get_new_cast_temperature()
-	var/temperature = tgui_input_number(owner, "How many degrees (kelvin) do you wish to shift temperature by?", "Convect", null, max_value = maximum_temperature_delta, min_value = minimum_temperature_delta, timeout = 5 SECONDS)
+	var/temperature = tgui_input_number(owner, "How many degrees (kelvin) do you wish to shift temperature by?", "Convect", null, max_value = maximum_temperature_delta, min_value = -maximum_temperature_delta, timeout = 5 SECONDS)
 	if (!temperature)
 		return FALSE
 	temperature_for_cast = temperature
@@ -105,10 +103,28 @@
 	var/datum/gas_mixture/air = cast_on.return_air()
 	var/datum/gas_mixture/turf_air = turf_target?.return_air()
 	if (air && air != turf_air) // if this has air and we arent a turf
-		air.temperature = clamp(air.temperature + temperature_for_cast, minimum_temperature_atmos, maximum_temperature_atmos) //don't want fusion temperatures in your pocket now dont you
+		if(air.temperature + temperature_for_cast >= maximum_temperature_atmos && temperature_for_cast <= 0) //veeery hot
+			air.temperature = max(air.temperature + temperature_for_cast, minimum_temperature_atmos)
+		else if(air.temperature + temperature_for_cast <= minimum_temperature_atmos && temperature_for_cast > 0) //veeery cold
+			air.temperature = min(air.temperature + temperature_for_cast, maximum_temperature_atmos)
+		else if(air.temperature + temperature_for_cast >= maximum_temperature_atmos && temperature_for_cast > 0) //These else if blocks suck. Why air doesn't have a proc to set temperature is byond me
+			air.temperature = maximum_temperature_atmos
+		else if(air.temperature + temperature_for_cast <= minimum_temperature_atmos && temperature_for_cast <= 0)
+			air.temperature = minimum_temperature_atmos
+		else
+			air.temperature = clamp(air.temperature + temperature_for_cast, minimum_temperature_atmos, maximum_temperature_atmos) //don't want fusion temperatures in your pocket now dont you
 		air.react(cast_on)
 	if (isturf(cast_on) && turf_air)
-		turf_air.temperature = clamp(turf_air.temperature + temperature_for_cast, minimum_temperature_atmos, maximum_temperature_atmos)
+		if(turf_air.temperature + temperature_for_cast >= maximum_temperature_atmos && temperature_for_cast <= 0)
+			turf_air.temperature = max(turf_air.temperature + temperature_for_cast, minimum_temperature_atmos)
+		else if(turf_air.temperature + temperature_for_cast <= minimum_temperature_atmos && temperature_for_cast > 0)
+			turf_air.temperature = min(turf_air.temperature + temperature_for_cast, maximum_temperature_atmos)
+		else if(turf_air.temperature + temperature_for_cast >= maximum_temperature_atmos && temperature_for_cast > 0)
+			turf_air.temperature = maximum_temperature_atmos
+		else if(turf_air.temperature + temperature_for_cast <= minimum_temperature_atmos && temperature_for_cast <= 0)
+			turf_air.temperature = minimum_temperature_atmos
+		else
+			turf_air.temperature = clamp(turf_air.temperature + temperature_for_cast, minimum_temperature_atmos, maximum_temperature_atmos)
 		turf_air.react(turf_target)
 		turf_target?.air_update_turf()