What is the best camera to shoot below -20 degrees in winter?

Professional SLR camera or non-reflex (micro-single) camera is preferred.

The camera stops working or works abnormally at low temperature, mainly because the battery can't work at low temperature. Professional cameras, especially outdoor cameras, have specially designed battery systems and battery compartments, and usually take technical measures such as heat preservation and micro-heating.

If you already have a camera, you can consider buying a special low-temperature battery. You can search online, and some brands with secondary brands are also very affordable. However, usually these batteries are equipped with SLR, and have never seen an ordinary card machine. If it is a camera such as a card machine, you can carry two batteries, one for use and one for backup. The spare battery is placed in the inner pocket of the jacket to keep warm, and will be replaced after a period of time to maintain the effectiveness of the battery. Some camera heat preservation sleeves designed by vice factory can be found in a treasure, and they can be used together if they are available.

For your reference.

Attachment: standard lens shooting.