Constant freezing and thawing will not be good! In fact here’s what is published in the Q & A section:
WHAT ARE THE TEMPERATURE REQUIREMENTS FOR DRY AGING WITH UMAI DRY® TECHNOLOGY?
Dry age at temperature between 34-38F. Typical household refrigerators and restaurant coolers are designed to protect food items like fruits, vegetables, fish and meats from spoilage without freezing them. Please make sure that your refrigerator maintains temperature between 34-38 F to ensure proper aging and prevent spoilage.
Personally I strongly suggest you get that out of that garage environment NOW and into your more stable refrigerator in my kitchen. Ron