diff --git a/README.md b/README.md
index 35c0011..58656b3 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 [![verified-by-homebridge](https://badgen.net/badge/homebridge/verified/purple)](https://github.com/homebridge/homebridge/wiki/Verified-Plugins)
 [![Discord](https://img.shields.io/discord/432663330281226270?color=728ED5&logo=discord&label=discord)](https://discord.gg/j5WwJTB)
 
-Nest plug-in for [Homebridge](https://github.com/nfarina/homebridge) using the native Nest API. See what's new in [release 4.6.4](https://github.com/chrisjshull/homebridge-nest/releases/tag/v4.6.4).
+Nest plug-in for [Homebridge](https://github.com/nfarina/homebridge) using the native Nest API. See what's new in [release 4.6.5](https://github.com/chrisjshull/homebridge-nest/releases/tag/v4.6.5).
 
 Integrate your Nest Thermostat, Temperature Sensors, Nest Protect, and Nest x Yale Lock devices into your HomeKit system. Both Nest Accounts (pre-August 2019) and Google Accounts are supported.
 
diff --git a/lib/nest-connection.js b/lib/nest-connection.js
index 5e547f4..abbbd3f 100644
--- a/lib/nest-connection.js
+++ b/lib/nest-connection.js
@@ -1169,7 +1169,7 @@ class Connection {
                         if (thisDevice.uses_heat_link) {
                             // EU/UK Heat Link thermostats use some slightly different fields, and support heat mode only
                             if (thisDevice.target_temperature_type === undefined) {
-                                thisDevice.target_temperature_type = (thisDevice.maint_band_lower == 0) ? 'OFF' : 'HEAT';
+                                thisDevice.target_temperature_type = (thisDevice.maint_band_lower == 0) ? 'off' : 'heat';
                             }
                             if (thisDevice.hvac_heater_state === undefined) {
                                 thisDevice.hvac_heater_state = !thisDevice.leaf;
diff --git a/lib/nest-thermostat-accessory.js b/lib/nest-thermostat-accessory.js
index e59eb04..3b8d919 100644
--- a/lib/nest-thermostat-accessory.js
+++ b/lib/nest-thermostat-accessory.js
@@ -290,6 +290,7 @@ class NestThermostatAccessory extends NestDeviceAccessory {
         }
 
         this.conn.verbose('setTargetHeatingCooling', val);
+        this.device.target_temperature_type = val;
         this.setPropertyAsync('shared', 'hvac_mode', val, 'target heating cooling').asCallback(callback);
     }
 
diff --git a/package.json b/package.json
index 73fa392..2749181 100644
--- a/package.json
+++ b/package.json
@@ -37,7 +37,7 @@
     "prepublishOnly": "npm run lint",
     "preversion": "npm run lint"
   },
-  "version": "4.6.4",
+  "version": "4.6.5",
   "warnings": [
     {
       "code": "ENOTSUP",
@@ -45,7 +45,7 @@
         "node": ">=7.0.0",
         "homebridge": ">=0.2.5"
       },
-      "pkgid": "homebridge-nest@4.6.4"
+      "pkgid": "homebridge-nest@4.6.5"
     }
   ]
 }