diff --git a/lib/openstudio-standards/prototypes/common/objects/Prototype.HeatExchangerAirToAirSensibleAndLatent.rb b/lib/openstudio-standards/prototypes/common/objects/Prototype.HeatExchangerAirToAirSensibleAndLatent.rb
index 1732559a5..82c2d6a36 100644
--- a/lib/openstudio-standards/prototypes/common/objects/Prototype.HeatExchangerAirToAirSensibleAndLatent.rb
+++ b/lib/openstudio-standards/prototypes/common/objects/Prototype.HeatExchangerAirToAirSensibleAndLatent.rb
@@ -119,12 +119,19 @@ def heat_exchanger_air_to_air_sensible_and_latent_apply_prototype_efficiency_ent
 
     heat_exchanger_air_to_air_sensible_and_latent.setSensibleEffectivenessat100HeatingAirFlow(full_htg_sens_eff)
     heat_exchanger_air_to_air_sensible_and_latent.setLatentEffectivenessat100HeatingAirFlow(full_htg_lat_eff)
-    heat_exchanger_air_to_air_sensible_and_latent.setSensibleEffectivenessat75HeatingAirFlow(part_htg_sens_eff)
-    heat_exchanger_air_to_air_sensible_and_latent.setLatentEffectivenessat75HeatingAirFlow(part_htg_lat_eff)
     heat_exchanger_air_to_air_sensible_and_latent.setSensibleEffectivenessat100CoolingAirFlow(full_cool_sens_eff)
     heat_exchanger_air_to_air_sensible_and_latent.setLatentEffectivenessat100CoolingAirFlow(full_cool_lat_eff)
-    heat_exchanger_air_to_air_sensible_and_latent.setSensibleEffectivenessat75CoolingAirFlow(part_cool_sens_eff)
-    heat_exchanger_air_to_air_sensible_and_latent.setLatentEffectivenessat75CoolingAirFlow(part_cool_lat_eff)
+    if model.version < OpenStudio::VersionString.new('3.8.0')
+      heat_exchanger_air_to_air_sensible_and_latent.setSensibleEffectivenessat75HeatingAirFlow(part_htg_sens_eff)
+      heat_exchanger_air_to_air_sensible_and_latent.setLatentEffectivenessat75HeatingAirFlow(part_htg_lat_eff)
+      heat_exchanger_air_to_air_sensible_and_latent.setSensibleEffectivenessat75CoolingAirFlow(part_cool_sens_eff)
+      heat_exchanger_air_to_air_sensible_and_latent.setLatentEffectivenessat75CoolingAirFlow(part_cool_lat_eff)
+    else
+      heat_exchanger_air_to_air_sensible_and_latent.setSensibleEffectivenessat75HeatingAirFlow(part_htg_sens_eff) unless part_htg_sens_eff.zero?
+      heat_exchanger_air_to_air_sensible_and_latent.setLatentEffectivenessat75HeatingAirFlow(part_htg_lat_eff) unless part_htg_lat_eff.zero?
+      heat_exchanger_air_to_air_sensible_and_latent.setSensibleEffectivenessat75CoolingAirFlow(part_cool_sens_eff) unless part_cool_sens_eff.zero?
+      heat_exchanger_air_to_air_sensible_and_latent.setLatentEffectivenessat75CoolingAirFlow(part_cool_lat_eff) unless part_cool_lat_eff.zero?
+    end
 
     OpenStudio.logFree(OpenStudio::Info, 'openstudio.standards.HeatExchangerSensLat', "For #{heat_exchanger_air_to_air_sensible_and_latent.name}: Set sensible and latent effectiveness calculated by using ERR.")
     return true
diff --git a/lib/openstudio-standards/standards/Standards.HeatExchangerSensLat.rb b/lib/openstudio-standards/standards/Standards.HeatExchangerSensLat.rb
index 42ae3618d..ff15cec88 100644
--- a/lib/openstudio-standards/standards/Standards.HeatExchangerSensLat.rb
+++ b/lib/openstudio-standards/standards/Standards.HeatExchangerSensLat.rb
@@ -11,12 +11,19 @@ def heat_exchanger_air_to_air_sensible_and_latent_apply_effectiveness(heat_excha
 
     heat_exchanger_air_to_air_sensible_and_latent.setSensibleEffectivenessat100HeatingAirFlow(full_htg_sens_eff)
     heat_exchanger_air_to_air_sensible_and_latent.setLatentEffectivenessat100HeatingAirFlow(full_htg_lat_eff)
-    heat_exchanger_air_to_air_sensible_and_latent.setSensibleEffectivenessat75HeatingAirFlow(part_htg_sens_eff)
-    heat_exchanger_air_to_air_sensible_and_latent.setLatentEffectivenessat75HeatingAirFlow(part_htg_lat_eff)
     heat_exchanger_air_to_air_sensible_and_latent.setSensibleEffectivenessat100CoolingAirFlow(full_cool_sens_eff)
     heat_exchanger_air_to_air_sensible_and_latent.setLatentEffectivenessat100CoolingAirFlow(full_cool_lat_eff)
-    heat_exchanger_air_to_air_sensible_and_latent.setSensibleEffectivenessat75CoolingAirFlow(part_cool_sens_eff)
-    heat_exchanger_air_to_air_sensible_and_latent.setLatentEffectivenessat75CoolingAirFlow(part_cool_lat_eff)
+    if heat_exchanger_air_to_air_sensible_and_latent.model.version < OpenStudio::VersionString.new('3.8.0')
+      heat_exchanger_air_to_air_sensible_and_latent.setSensibleEffectivenessat75HeatingAirFlow(part_htg_sens_eff)
+      heat_exchanger_air_to_air_sensible_and_latent.setLatentEffectivenessat75HeatingAirFlow(part_htg_lat_eff)
+      heat_exchanger_air_to_air_sensible_and_latent.setSensibleEffectivenessat75CoolingAirFlow(part_cool_sens_eff)
+      heat_exchanger_air_to_air_sensible_and_latent.setLatentEffectivenessat75CoolingAirFlow(part_cool_lat_eff)
+    else
+      heat_exchanger_air_to_air_sensible_and_latent.setSensibleEffectivenessat75HeatingAirFlow(part_htg_sens_eff) unless part_htg_sens_eff.zero?
+      heat_exchanger_air_to_air_sensible_and_latent.setLatentEffectivenessat75HeatingAirFlow(part_htg_lat_eff) unless part_htg_lat_eff.zero?
+      heat_exchanger_air_to_air_sensible_and_latent.setSensibleEffectivenessat75CoolingAirFlow(part_cool_sens_eff) unless part_cool_sens_eff.zero?
+      heat_exchanger_air_to_air_sensible_and_latent.setLatentEffectivenessat75CoolingAirFlow(part_cool_lat_eff) unless part_cool_lat_eff.zero?
+    end
 
     OpenStudio.logFree(OpenStudio::Info, 'openstudio.standards.HeatExchangerSensLat', "For #{heat_exchanger_air_to_air_sensible_and_latent.name}: Set sensible and latent effectiveness.")
 
diff --git a/lib/openstudio-standards/standards/ashrae_90_1/nrel_zne_ready_2017/nrel_zne_ready_2017.AirLoopHVAC.rb b/lib/openstudio-standards/standards/ashrae_90_1/nrel_zne_ready_2017/nrel_zne_ready_2017.AirLoopHVAC.rb
index 5c48ab0cb..9ac631e68 100644
--- a/lib/openstudio-standards/standards/ashrae_90_1/nrel_zne_ready_2017/nrel_zne_ready_2017.AirLoopHVAC.rb
+++ b/lib/openstudio-standards/standards/ashrae_90_1/nrel_zne_ready_2017/nrel_zne_ready_2017.AirLoopHVAC.rb
@@ -808,12 +808,14 @@ def air_loop_hvac_apply_energy_recovery_ventilator_efficiency(erv, erv_type: 'ER
       if erv_type == 'HRV'
         erv.setSensibleEffectivenessat100HeatingAirFlow(0.865)
         erv.setLatentEffectivenessat100HeatingAirFlow(0.0)
-        erv.setSensibleEffectivenessat75HeatingAirFlow(0.887)
-        erv.setLatentEffectivenessat75HeatingAirFlow(0.0)
         erv.setSensibleEffectivenessat100CoolingAirFlow(0.865)
         erv.setLatentEffectivenessat100CoolingAirFlow(0.0)
+        erv.setSensibleEffectivenessat75HeatingAirFlow(0.887)
         erv.setSensibleEffectivenessat75CoolingAirFlow(0.887)
-        erv.setLatentEffectivenessat75CoolingAirFlow(0.0)
+        if erv.model.version < OpenStudio::VersionString.new('3.8.0')
+          erv.setLatentEffectivenessat75HeatingAirFlow(0.0)
+          erv.setLatentEffectivenessat75CoolingAirFlow(0.0)
+        end
       else
         erv.setSensibleEffectivenessat100HeatingAirFlow(0.755)
         erv.setLatentEffectivenessat100HeatingAirFlow(0.564)
@@ -829,11 +831,13 @@ def air_loop_hvac_apply_energy_recovery_ventilator_efficiency(erv, erv_type: 'ER
         erv.setSensibleEffectivenessat100HeatingAirFlow(0.75)
         erv.setLatentEffectivenessat100HeatingAirFlow(0.0)
         erv.setSensibleEffectivenessat75HeatingAirFlow(0.79)
-        erv.setLatentEffectivenessat75HeatingAirFlow(0.0)
         erv.setSensibleEffectivenessat100CoolingAirFlow(0.75)
         erv.setLatentEffectivenessat100CoolingAirFlow(0.0)
         erv.setSensibleEffectivenessat75CoolingAirFlow(0.78)
-        erv.setLatentEffectivenessat75CoolingAirFlow(0.0)
+        if erv.model.version < OpenStudio::VersionString.new('3.8.0')
+          erv.setLatentEffectivenessat75HeatingAirFlow(0.0)
+          erv.setLatentEffectivenessat75CoolingAirFlow(0.0)
+        end
       else
         erv.setSensibleEffectivenessat100HeatingAirFlow(0.75)
         erv.setLatentEffectivenessat100HeatingAirFlow(0.74)
diff --git a/lib/openstudio-standards/standards/necb/NECB2011/hvac_systems.rb b/lib/openstudio-standards/standards/necb/NECB2011/hvac_systems.rb
index ae364a156..95632b605 100644
--- a/lib/openstudio-standards/standards/necb/NECB2011/hvac_systems.rb
+++ b/lib/openstudio-standards/standards/necb/NECB2011/hvac_systems.rb
@@ -383,12 +383,19 @@ def heat_exchanger_air_to_air_sensible_and_latent_apply_effectiveness(heat_excha
     heat_exchanger_air_to_air_sensible_and_latent.setHeatExchangerType(erv_info['HeatExchangerType'])
     heat_exchanger_air_to_air_sensible_and_latent.setSensibleEffectivenessat100HeatingAirFlow(erv_info['SensibleEffectivenessat100HeatingAirFlow'])
     heat_exchanger_air_to_air_sensible_and_latent.setLatentEffectivenessat100HeatingAirFlow(erv_info['LatentEffectivenessat100HeatingAirFlow'])
-    heat_exchanger_air_to_air_sensible_and_latent.setSensibleEffectivenessat75HeatingAirFlow(erv_info['SensibleEffectivenessat75HeatingAirFlow'])
-    heat_exchanger_air_to_air_sensible_and_latent.setLatentEffectivenessat75HeatingAirFlow(erv_info['LatentEffectivenessat75HeatingAirFlow'])
     heat_exchanger_air_to_air_sensible_and_latent.setSensibleEffectivenessat100CoolingAirFlow(erv_info['SensibleEffectivenessat100CoolingAirFlow'])
     heat_exchanger_air_to_air_sensible_and_latent.setLatentEffectivenessat100CoolingAirFlow(erv_info['LatentEffectivenessat100CoolingAirFlow'])
-    heat_exchanger_air_to_air_sensible_and_latent.setSensibleEffectivenessat75CoolingAirFlow(erv_info['SensibleEffectivenessat75CoolingAirFlow'])
-    heat_exchanger_air_to_air_sensible_and_latent.setLatentEffectivenessat75CoolingAirFlow(erv_info['LatentEffectivenessat75CoolingAirFlow'])
+    if heat_exchanger_air_to_air_sensible_and_latent.model.version < OpenStudio::VersionString.new('3.8.0')
+      heat_exchanger_air_to_air_sensible_and_latent.setSensibleEffectivenessat75HeatingAirFlow(erv_info['SensibleEffectivenessat75HeatingAirFlow'])
+      heat_exchanger_air_to_air_sensible_and_latent.setLatentEffectivenessat75HeatingAirFlow(erv_info['LatentEffectivenessat75HeatingAirFlow'])
+      heat_exchanger_air_to_air_sensible_and_latent.setSensibleEffectivenessat75CoolingAirFlow(erv_info['SensibleEffectivenessat75CoolingAirFlow'])
+      heat_exchanger_air_to_air_sensible_and_latent.setLatentEffectivenessat75CoolingAirFlow(erv_info['LatentEffectivenessat75CoolingAirFlow'])
+    else
+      heat_exchanger_air_to_air_sensible_and_latent.setSensibleEffectivenessat75HeatingAirFlow(erv_info['SensibleEffectivenessat75HeatingAirFlow']) unless erv_info['SensibleEffectivenessat75HeatingAirFlow'].zero?
+      heat_exchanger_air_to_air_sensible_and_latent.setLatentEffectivenessat75HeatingAirFlow(erv_info['LatentEffectivenessat75HeatingAirFlow']) unless erv_info['LatentEffectivenessat75HeatingAirFlow'].zero?
+      heat_exchanger_air_to_air_sensible_and_latent.setSensibleEffectivenessat75CoolingAirFlow(erv_info['SensibleEffectivenessat75CoolingAirFlow']) unless erv_info['SensibleEffectivenessat75CoolingAirFlow'].zero?
+      heat_exchanger_air_to_air_sensible_and_latent.setLatentEffectivenessat75CoolingAirFlow(erv_info['LatentEffectivenessat75CoolingAirFlow']) unless erv_info['LatentEffectivenessat75CoolingAirFlow'].zero?
+    end
     heat_exchanger_air_to_air_sensible_and_latent.setSupplyAirOutletTemperatureControl(erv_info['SupplyAirOutletTemperatureControl'])
     heat_exchanger_air_to_air_sensible_and_latent.setFrostControlType(erv_info['FrostControlType'])
     heat_exchanger_air_to_air_sensible_and_latent.setEconomizerLockout(erv_info['EconomizerLockout'])