diff --git a/building_energy_standards_data/database_files/hvac_minimum_requirements_furnaces_90_1.json b/building_energy_standards_data/database_files/hvac_minimum_requirements_furnaces_90_1.json
index bf5d364..67d7da1 100644
--- a/building_energy_standards_data/database_files/hvac_minimum_requirements_furnaces_90_1.json
+++ b/building_energy_standards_data/database_files/hvac_minimum_requirements_furnaces_90_1.json
@@ -715,7 +715,7 @@
         "start_date": "9/9/1919",
         "end_date": "9/9/2999",
         "minimum_annual_fuel_utilization_efficiency": 0.81,
-        "minimum_thermal_efficiency": null,
+        "minimum_thermal_efficiency": 0.8,
         "minimum_combustion_efficiency": null,
         "standby_mode_power": null,
         "off_mode_power": null,
@@ -810,7 +810,7 @@
         "start_date": "9/9/1919",
         "end_date": "9/9/2999",
         "minimum_annual_fuel_utilization_efficiency": 0.78,
-        "minimum_thermal_efficiency": null,
+        "minimum_thermal_efficiency": 0.8,
         "minimum_combustion_efficiency": null,
         "standby_mode_power": null,
         "off_mode_power": null,
diff --git a/building_energy_standards_data/database_files/hvac_minimum_requirements_furnaces_IECC.json b/building_energy_standards_data/database_files/hvac_minimum_requirements_furnaces_IECC.json
index 2e2a252..7ed7173 100644
--- a/building_energy_standards_data/database_files/hvac_minimum_requirements_furnaces_IECC.json
+++ b/building_energy_standards_data/database_files/hvac_minimum_requirements_furnaces_IECC.json
@@ -715,7 +715,7 @@
         "start_date": "9/9/1919",
         "end_date": "9/9/2999",
         "minimum_annual_fuel_utilization_efficiency": 0.81,
-        "minimum_thermal_efficiency": null,
+        "minimum_thermal_efficiency": 0.8,
         "minimum_combustion_efficiency": null,
         "standby_mode_power": null,
         "off_mode_power": null,
@@ -810,7 +810,7 @@
         "start_date": "9/9/1919",
         "end_date": "9/9/2999",
         "minimum_annual_fuel_utilization_efficiency": 0.78,
-        "minimum_thermal_efficiency": null,
+        "minimum_thermal_efficiency": 0.8,
         "minimum_combustion_efficiency": null,
         "standby_mode_power": null,
         "off_mode_power": null,
@@ -1019,7 +1019,7 @@
         "start_date": "9/9/1919",
         "end_date": "9/9/2999",
         "minimum_annual_fuel_utilization_efficiency": 0.81,
-        "minimum_thermal_efficiency": null,
+        "minimum_thermal_efficiency": 0.8,
         "minimum_combustion_efficiency": null,
         "standby_mode_power": null,
         "off_mode_power": null,
@@ -1057,7 +1057,7 @@
         "start_date": "9/9/1919",
         "end_date": "9/9/2999",
         "minimum_annual_fuel_utilization_efficiency": 0.81,
-        "minimum_thermal_efficiency": null,
+        "minimum_thermal_efficiency": 0.8,
         "minimum_combustion_efficiency": null,
         "standby_mode_power": null,
         "off_mode_power": null,