Please note that commands without {room} will only work if you only have one thermostat device. If you have multiple, please name them in the command line. 

Purpose
Command
Check for the temperature
Alexa, what's the temperature inside
Alexa, what's the temperature in {room}
Check for AC state
Alexa, is the {room} on/off?
Set Target Temperature Relative to Ambient Temperature
Alexa, make it [warmer/cooler]
Alexa, make it [warmer/cooler] in {room}
Alexa, [raise/lower] temperature
Alexa, [raise/lower] temperature in {room}
Alexa, [raise/lower] temperature {x} degrees
Alexa, [raise/lower] temperature {x} degrees in {room}
Set Absolute Target Temperature
Alexa, set the temperature to 22
Alexa, set the temperature to 22 in {room}
Alexa, set the {room} to 22
Set Thermostat Mode
Alexa, turn on the [heat/cooling]
Alexa, turn on the [heat/cooling] in {room}
Alexa, set {room} to [heat/cool]
Mixed (Absolute Target Temperature & Thermostat Mode)
Alexa, set the heat to 28
Alexa, set the air conditioning to 16
Alexa, set the heat in {room} to 28
Alexa, set the air conditioning in {room} to 16