diff --git a/code/ATMOSPHERICS/components/unary/heat_source.dm b/code/ATMOSPHERICS/components/unary/heat_source.dm
index 01438c32d99..2d3e9b67a8e 100644
--- a/code/ATMOSPHERICS/components/unary/heat_source.dm
+++ b/code/ATMOSPHERICS/components/unary/heat_source.dm
@@ -26,7 +26,7 @@
 
 	process()
 		..()
-		if(!on)
+		if(!on || !network)
 			return 0
 		var/air_heat_capacity = air_contents.heat_capacity()
 		var/combined_heat_capacity = current_heat_capacity + air_heat_capacity