diff --git a/.github/workflows/python-app.yaml b/.github/workflows/python-app.yaml
index 15a3492e..5e360a9b 100644
--- a/.github/workflows/python-app.yaml
+++ b/.github/workflows/python-app.yaml
@@ -9,7 +9,7 @@ jobs:
     strategy:
       matrix:
         # Apparently 3.10 gets converted to 3.1 if it's not a string. Brilliant.
-        python-version: [3.7, 3.8, 3.9, '3.10', '3.11']
+        python-version: [3.8, 3.9, '3.10', '3.11']
 
     steps:
     - uses: actions/checkout@v3
@@ -22,7 +22,7 @@ jobs:
         python -m pip install --upgrade pip
         pip install wheel flake8
         pip install -r dev-requirements.txt
-        pip install -e .
+        pip install -r requirements.txt
     - name: Prime Cache
       run: |
         mkdir $HOME/.eeweather
diff --git a/.github/workflows/windows_conda_testing.yaml b/.github/workflows/windows_conda_testing.yaml
index c289b9a0..b7a57ac4 100644
--- a/.github/workflows/windows_conda_testing.yaml
+++ b/.github/workflows/windows_conda_testing.yaml
@@ -32,6 +32,6 @@ jobs:
         C:\Miniconda\condabin\conda.bat activate base
         C:\Miniconda\condabin\conda.bat install pytest pytest-cov coverage mock pip
         C:\Miniconda\condabin\conda.bat install -c conda-forge shapely
-        pip install -e .
+        pip install -r requirements.txt
         pytest
 
diff --git a/tests/test_equipment_type.py b/tests/test_equipment_type.py
index a7b6cbc2..41bc56f8 100644
--- a/tests/test_equipment_type.py
+++ b/tests/test_equipment_type.py
@@ -12,6 +12,7 @@
     validate_heat_stage,
     validate_cool_stage,
     first_stage_capacity_ratio,
+    is_line_voltage,
     )
 
 
@@ -41,6 +42,7 @@ def test_has_heating():
         'furnace_or_boiler',  # Non heat pump heating (gas or oil furnace, electric resistance)
         'heat_pump_electric_backup',   # Heat pump with electric resistance heat (strip heat)
         'heat_pump_no_electric_backup',  # Heat pump without electric resistance heat
+        'electric_resistance',  # Electric Resistance (Line-voltage thermostat)
     ]:
         assert(has_heating(i) is True)
     for i in [
@@ -112,6 +114,11 @@ def test_has_resistance_heat():
     assert(has_resistance_heat('heat_pump_dual_fuel') is False)
 
 
+def test_is_line_voltage():
+    assert(is_line_voltage('electric_resistance') is True)
+    assert(is_line_voltage('heat_pump_dual_fuel') is False)
+
+
 def test_ratio():
     assert(first_stage_capacity_ratio('furnace_or_boiler') == .65)
     assert(first_stage_capacity_ratio('heat_pump') == .72)
diff --git a/thermostat/equipment_type.py b/thermostat/equipment_type.py
index 6c7a8374..3618817b 100644
--- a/thermostat/equipment_type.py
+++ b/thermostat/equipment_type.py
@@ -5,6 +5,7 @@
     'heat_pump_electric_backup',   # Heat pump with electric resistance heat (strip heat)
     'heat_pump_no_electric_backup',  # Heat pump without electric resistance heat
     'heat_pump_dual_fuel',  # Dual fuel heat pump (e.g. gas or oil fired)
+    'electric_resistance',  # Line voltage thermostat electric resistance heat
     'other',  # Multi-zone, ?
     'none',  # No central heating system
     ]
@@ -17,6 +18,7 @@
     'two_speed',  # Dual capacity heater or dual stage compressor (synonym)
     'modulating',  # Modulating or variable capacity unit
     'variable_speed',   # Modulating or variable capacity unit
+    'none',  # No central heating system
     ]
 
 COOL_TYPE = [
@@ -33,6 +35,7 @@
     'two_stage',  # Dual stage compressor (synonym)
     'modulating',  # Modulating or variable capacity compressor
     'variable_speed',   # Modulating or variable capacity unit
+    'none',  # No central cooling system
     ]
 
 #: This mapping is for old scripts that need to refer to the old mapping, but want to use the new functionality.
@@ -238,6 +241,24 @@ def has_resistance_heat(heat_type):
     return False
 
 
+def is_line_voltage(heat_type):
+    """ Determines if the heat type is valid for line-voltage thermostats
+
+    Parameters
+    ----------
+    heat_type : str
+        The name of the heating type
+
+
+    Returns
+    -------
+    boolean
+    """
+    if heat_type == 'electric_resistance':
+        return True
+    return False
+
+
 def validate_heat_type(heat_type):
     if heat_type is None or heat_type == '' or heat_type in HEAT_TYPE:
         return True
diff --git a/thermostat/importers.py b/thermostat/importers.py
index 32e00309..9f087ae5 100644
--- a/thermostat/importers.py
+++ b/thermostat/importers.py
@@ -17,6 +17,7 @@
     has_two_stage_heating,
     has_multi_stage_cooling,
     has_multi_stage_heating,
+    is_line_voltage,
     first_stage_capacity_ratio,
     )
 
@@ -384,6 +385,12 @@ def get_single_thermostat(thermostat_id, zipcode,
     temp_out = get_indexed_temperatures_eeweather(station, hourly_index_utc - utc_offset)
     temp_out.index = hourly_index
 
+    # Validate line-voltage heat-type doesn't have cooling
+    if is_line_voltage(heat_type) and has_cooling(cool_type):
+        message = ("Line-voltage thermostat thermostat_id={} has cooling type set. "
+                   "This thermostat-type doesn't support cooling.".format(thermostat_id))
+        raise RuntimeError(message)
+
     # load daily time series values
     auxiliary_heat_runtime, emergency_heat_runtime = _calculate_aux_emerg_runtime(df, thermostat_id, heat_type, heat_stage, hourly_index)
     cool_runtime = _calculate_cool_runtime(df, thermostat_id, cool_type, cool_stage, hourly_index)