atmos firelock, changes to temp blocking

code/modules/atmospherics/environmental/LINDA_turf_tile.dm

@@ -358,6 +358,9 @@
 	SSair.excited_groups -= src
 
 ////////////////////////SUPERCONDUCTIVITY/////////////////////////////
+/atom/movable/proc/blocksTemperature()
+	return FALSE
+
 /turf/proc/conductivity_directions()
 	if(archived_cycle < SSair.times_fired)
 		archive()
@@ -372,6 +375,9 @@
 			. |= direction
 
 /turf/proc/neighbor_conduct_with_src(turf/open/other)
+	for (var/atom/movable/G in src)
+		if (G.blocksTemperature())
+			return
 	if(!other.blocks_air) //Open but neighbor is solid
 		other.temperature_share_open_to_solid(src)
 	else //Both tiles are solid
@@ -382,7 +388,9 @@
 	if(blocks_air)
 		..()
 		return
-
+	for (var/atom/movable/G in src)
+		if (G.blocksTemperature())
+			return
 	if(!other.blocks_air) //Both tiles are open
 		var/turf/open/T = other
 		T.air.temperature_share(air, WINDOW_HEAT_TRANSFER_COEFFICIENT)
@@ -401,10 +409,8 @@
 
 				if(!neighbor.thermal_conductivity)
 					continue
-
 				if(neighbor.archived_cycle < SSair.times_fired)
 					neighbor.archive()
-
 				neighbor.neighbor_conduct_with_src(src)
 
 				neighbor.consider_superconductivity()

code/modules/research/designs/misc_designs.dm

@@ -364,6 +364,16 @@
 	category = list("Equipment")
 	departmental_flags = DEPARTMENTAL_FLAG_ENGINEERING
 
+/datum/design/holosignfirelock
+	name = "ATMOS Holofirelock Projector"
+	desc = "A holographic projector that creates holographic barriers that prevent changes in temperature conditions."
+	id = "holosignfirelock"
+	build_type = PROTOLATHE
+	materials = list(MAT_METAL = 5000, MAT_GLASS = 1000, MAT_GOLD = 1000, MAT_SILVER = 1000)
+	build_path = /obj/item/holosign_creator/firelock
+	category = list("Equipment")
+	departmental_flags = DEPARTMENTAL_FLAG_ENGINEERING
+
 /datum/design/forcefield_projector
 	name = "Forcefield Projector"
 	desc = "A device which can project temporary forcefields to seal off an area."

code/modules/research/techweb/all_nodes.dm

@@ -430,7 +430,7 @@
 	display_name = "Electromagnetic Theory"
 	description = "Study into usage of frequencies in the electromagnetic spectrum."
 	prereq_ids = list("base")
-	design_ids = list("holosign", "holosignsec", "holosignengi", "holosignatmos", "inducer", "tray_goggles", "holopad")
+	design_ids = list("holosign", "holosignsec", "holosignengi", "holosignatmos", "holosignfirelock", "inducer", "tray_goggles", "holopad")
 	research_costs = list(TECHWEB_POINT_TYPE_GENERIC = 2500)
 	export_price = 5000