Is anyone from the Triangle area of North Carolina interested in forming a study group that is flexible to meet online or in person? I’m taking the February test, as well as the April one, so if anyone wants to partner up, let me know.
Aside from group study and accountability, it would be nice to also have it function as a local support group that can help ease the stress, or just to have another person who recognizes the source of your struggles. I’m hoping to find a balance between studying and support with others in the area who are also going through the same journey.

“Accustomed to maintain” is habit-language. Habits are usually compared within the same situation unless the sentence tells you the situation changed. Pair that with “on very cold days,” and it strongly suggests: when it’s very cold, they used to keep it at X, now they keep it at Y, and Y is lower.
Grammatically, “on very cold days” lives inside the comparison clause (“accustomed to maintain”), not inside the main clause (“maintained a lower temperature”). So, strictly speaking, the sentence explicitly tells you the baseline is “what they were accustomed to on very cold days” (vs what they were not accustomed to on very cold days).