When making “chillers” out of AC units, the low tech version is to place the sensor in a glass of warm water…the “high tech” version is to use one of these
https://www.amazon.com/Century-BNQ-T7B-Digital-Cooling-Controller/dp/B01LZV591B
I wouldn’t consider either ideal, but if you can get joy no other way…
Edit: or use the high tech version of the glass of warm water above 
