diff --git a/examples/compression_heatpump_and_chiller/airsource_heatpump_const_max_output.py b/examples/compression_heatpump_and_chiller/airsource_heatpump_const_max_output.py
index 1a7d7a0a..10170b32 100644
--- a/examples/compression_heatpump_and_chiller/airsource_heatpump_const_max_output.py
+++ b/examples/compression_heatpump_and_chiller/airsource_heatpump_const_max_output.py
@@ -100,11 +100,6 @@ def airource_hp_const_example():
     energysystem = solph.EnergySystem()
     energysystem.restore(dpath=None, filename=None)
 
-    results = energysystem.results["main"]
-
-    electricity_bus = solph.views.node(results, "electricity")
-    heat_bus = solph.views.node(results, "heat")
-
     string_results = solph.views.convert_keys_to_strings(
         energysystem.results["main"]
     )
diff --git a/examples/compression_heatpump_and_chiller/cop_dependence_on_temperature_difference.py b/examples/compression_heatpump_and_chiller/cop_dependence_on_temperature_difference.py
index eb30d6c5..c26c6160 100644
--- a/examples/compression_heatpump_and_chiller/cop_dependence_on_temperature_difference.py
+++ b/examples/compression_heatpump_and_chiller/cop_dependence_on_temperature_difference.py
@@ -58,9 +58,6 @@ def cop_temperature_example():
         temp_high - temp_diff_q for temp_diff_q in temperature_diff_q_grade
     ]
     for q in quality_grades:
-        list_temp_low = [
-            temp_high - temp_diff_q for temp_diff_q in temperature_diff_q_grade
-        ]
         cops_q_grade[q] = cmpr_hp_chiller.calc_cops(
             temp_high=[temp_high],
             temp_low=list_temp_low_q_grade,
diff --git a/examples/stratified_thermal_storage/operation_facade.py b/examples/stratified_thermal_storage/operation_facade.py
index 0ace2c97..e3c55e43 100644
--- a/examples/stratified_thermal_storage/operation_facade.py
+++ b/examples/stratified_thermal_storage/operation_facade.py
@@ -10,7 +10,6 @@
 from oemof.solph import Bus  # noqa
 from oemof.solph import EnergySystem
 from oemof.solph import Flow
-from oemof.solph import Model
 from oemof.solph.components import Sink
 from oemof.solph.components import Source
 
@@ -58,7 +57,6 @@ def print_parameters():
     print_parameters()
 
     # Set up an energy system model
-    solver = "cbc"
     periods = 100
     datetimeindex = pd.date_range("1/1/2019", periods=periods, freq="H")
     demand_timeseries = np.zeros(periods)