diff --git a/src/lib/seam/locks/lock-device.ts b/src/lib/seam/locks/lock-device.ts
index ccd759003..30ff4ccd7 100644
--- a/src/lib/seam/locks/lock-device.ts
+++ b/src/lib/seam/locks/lock-device.ts
@@ -7,12 +7,12 @@ export type LockDevice = Omit<Device, 'properties'> & {
 
 export const isLockDevice = (device: Device): device is LockDevice => {
   return (
-    'locked' in device.properties ||
-    'can_remotely_lock' in device ||
-    'can_remotely_unlock' in device ||
-    'can_program_online_access_codes' in device ||
-    'can_program_offline_access_codes' in device ||
-    device.properties.online_access_codes_enabled === true ||
-    device.properties.offline_access_codes_enabled === true
+    device.properties.locked != null ||
+    device.can_remotely_lock != null ||
+    device.can_remotely_unlock != null ||
+    device.can_program_online_access_codes != null ||
+    device.can_program_offline_access_codes != null ||
+    device.properties.online_access_codes_enabled != null ||
+    device.properties.offline_access_codes_enabled != null
   )
 }
diff --git a/src/lib/seam/noise-sensors/noise-sensor-device.ts b/src/lib/seam/noise-sensors/noise-sensor-device.ts
index cd8e58350..5284e811e 100644
--- a/src/lib/seam/noise-sensors/noise-sensor-device.ts
+++ b/src/lib/seam/noise-sensors/noise-sensor-device.ts
@@ -7,4 +7,4 @@ export type NoiseSensorDevice = Omit<Device, 'properties'> & {
 
 export const isNoiseSensorDevice = (
   device: Device
-): device is NoiseSensorDevice => 'noise_level_decibels' in device.properties
+): device is NoiseSensorDevice => device.properties.noise_level_decibels != null
diff --git a/src/lib/seam/thermostats/thermostat-device.ts b/src/lib/seam/thermostats/thermostat-device.ts
index e1203aed8..1b29e1797 100644
--- a/src/lib/seam/thermostats/thermostat-device.ts
+++ b/src/lib/seam/thermostats/thermostat-device.ts
@@ -37,7 +37,7 @@ export interface ClimateSetting {
 export const isThermostatDevice = (
   device: Device
 ): device is ThermostatDevice =>
-  'available_climate_presets' in device.properties
+  device.properties.available_climate_presets != null
 
 export type ThermostatClimatePreset =
   ThermostatDevice['properties']['available_climate_presets'][number]