diff --git a/lib/extension/homeassistant.js b/lib/extension/homeassistant.js
index 3c6b408a..d7604b28 100644
--- a/lib/extension/homeassistant.js
+++ b/lib/extension/homeassistant.js
@@ -377,7 +377,7 @@ const cfg = {
     },
 
     // Thermostat/HVAC
-    'thermostat': (minTemp=7, maxTemp=30, temperatureStateProperty='occupied_heating_setpoint') => {
+    'thermostat': (minTemp=7, maxTemp=30, temperatureStateProperty='occupied_heating_setpoint', tempStep=1) => {
         return {
             type: 'climate',
             object_id: 'climate',
@@ -394,6 +394,7 @@ const cfg = {
                 temperature_state_topic: true,
                 temperature_state_template: `{{ value_json.${temperatureStateProperty} }}`,
                 temperature_command_topic: temperatureStateProperty,
+                temp_step: tempStep,
             },
         };
     },
@@ -649,7 +650,7 @@ const mapping = {
     '4090130P7': [cfg.light_brightness_colortemp_colorxy],
     '100.110.39': [cfg.light_brightness_colortemp_colorxy],
     'TI0001': [switchWithPostfix('left'), switchWithPostfix('right')],
-    'SPZB0001': [cfg.thermostat(5, 30, 'current_heating_setpoint'), cfg.sensor_battery],
+    'SPZB0001': [cfg.thermostat(5, 30, 'current_heating_setpoint', 0.5), cfg.sensor_battery],
     'HS3CG': [cfg.binary_sensor_gas],
     '81825': [cfg.sensor_action],
     'Z809AF': [cfg.switch, cfg.sensor_power],