diff --git a/code/modules/atmospherics/machinery/components/trinary_devices/mixer.dm b/code/modules/atmospherics/machinery/components/trinary_devices/mixer.dm
index e37b0c5f4fe..862fbc65c89 100644
--- a/code/modules/atmospherics/machinery/components/trinary_devices/mixer.dm
+++ b/code/modules/atmospherics/machinery/components/trinary_devices/mixer.dm
@@ -84,8 +84,12 @@
 	//Calculate necessary moles to transfer using PV=nRT
 	var/general_transfer = (target_pressure - output_starting_pressure) * air3.volume / R_IDEAL_GAS_EQUATION
 
-	var/transfer_moles1 = air1.temperature ? node1_concentration * general_transfer / air1.temperature : 0
-	var/transfer_moles2 = air2.temperature ? node2_concentration * general_transfer / air2.temperature : 0
+	//Calculate combined temperature for accurate output ratio
+	var/combined_heat_capacity = air1.heat_capacity() + air2.heat_capacity()
+	var/equalized_temperature = combined_heat_capacity ? (air1.thermal_energy() + air2.thermal_energy()) / combined_heat_capacity : 0
+
+	var/transfer_moles1 = equalized_temperature ? (node1_concentration * general_transfer) / equalized_temperature : 0
+	var/transfer_moles2 = equalized_temperature ? (node2_concentration * general_transfer) / equalized_temperature : 0
 
 	var/air1_moles = air1.total_moles()
 	var/air2_moles = air2.total_moles()