diff --git a/HPXMLtoOpenStudio/measure.xml b/HPXMLtoOpenStudio/measure.xml
index 90a88c0d34..89fa420476 100644
--- a/HPXMLtoOpenStudio/measure.xml
+++ b/HPXMLtoOpenStudio/measure.xml
@@ -3,8 +3,8 @@
   <schema_version>3.1</schema_version>
   <name>hpxm_lto_openstudio</name>
   <uid>b1543b30-9465-45ff-ba04-1d1f85e763bc</uid>
-  <version_id>972718e7-19fc-4b8f-adc9-246916d17229</version_id>
-  <version_modified>2023-08-25T14:42:54Z</version_modified>
+  <version_id>9f0c57c4-a887-4b4a-bf50-90ba783b18d9</version_id>
+  <version_modified>2023-09-11T23:05:26Z</version_modified>
   <xml_checksum>D8922A73</xml_checksum>
   <class_name>HPXMLtoOpenStudio</class_name>
   <display_name>HPXML to OpenStudio Translator</display_name>
@@ -322,7 +322,7 @@
       <filename>hvac.rb</filename>
       <filetype>rb</filetype>
       <usage_type>resource</usage_type>
-      <checksum>63E26750</checksum>
+      <checksum>B86B4518</checksum>
     </file>
     <file>
       <filename>hvac_sizing.rb</filename>
diff --git a/HPXMLtoOpenStudio/resources/hvac.rb b/HPXMLtoOpenStudio/resources/hvac.rb
index 3e27e48f55..b583dc5950 100644
--- a/HPXMLtoOpenStudio/resources/hvac.rb
+++ b/HPXMLtoOpenStudio/resources/hvac.rb
@@ -284,10 +284,10 @@ def self.apply_ground_to_air_heat_pump(model, runner, weather, heat_pump,
     ground_heat_exch_vert.setUTubeDistance(UnitConversions.convert(heat_pump.geothermal_loop.shank_spacing, 'in', 'm'))
     ground_heat_exch_vert.setPipeThickness(UnitConversions.convert((hp_ap.pipe_od - hp_ap.pipe_id) / 2.0, 'in', 'm'))
     ground_heat_exch_vert.setMaximumLengthofSimulation(1)
-    ground_heat_exch_vert.setGFunctionReferenceRatio(0.0005)
     ground_heat_exch_vert.setDesignFlowRate(UnitConversions.convert(hp_ap.GSHP_Loop_flow, 'gal/min', 'm^3/s'))
     ground_heat_exch_vert.setNumberofBoreHoles(hp_ap.GSHP_Bore_Holes.to_i)
     ground_heat_exch_vert.setBoreHoleLength(UnitConversions.convert(hp_ap.GSHP_Bore_Depth, 'ft', 'm'))
+    ground_heat_exch_vert.setGFunctionReferenceRatio(ground_heat_exch_vert.boreHoleRadius.get / ground_heat_exch_vert.boreHoleLength.get) # ensure this ratio is consistent with rb/H so that g values will be taken as-is
     ground_heat_exch_vert.removeAllGFunctions
     for i in 0..(hp_ap.GSHP_G_Functions[0].size - 1)
       ground_heat_exch_vert.addGFunction(hp_ap.GSHP_G_Functions[0][i], hp_ap.GSHP_G_Functions[1][i])