I don’t continuously heat my shop so I have been seeing temperatures down as low as 40 degrees (F.). I can warm the air up for awhile to 60+ F. with heaters but the concrete floor is still cold.
Once I come in from the cold my body and circulation can’t make up for the chill in my lower extremities so I have to resort to heating pads on my legs and feet. That can’t be a good condition to endure so I don’t tough it out very long when internal shop temperatures drop below 60.
Spring can’t come (and stay) soon enough.