The chamber is passively heated to 50°C (, I guess the ambient temperature in the enclosure easily reaches your target temperature of 65°C but it’s not stated as this..
Here a few links:
Snapmaker U1 Color 3D Printer: 5X More Speed. 5X Less Waste., via @Kickstarter https://www.kickstarter.com/projects/snapmaker/snapmaker-u1-color-3d-printer-5x-more-speed-5x-less-waste?ref=android_project_share
https://support.snapmaker.com/hc/en-us/articles/33344279396759-FAQ-for-Snapmaker-U1-3D-Printer
May @Sherry jumps in, please?