I like to observe things and about thyroid I have noticed a great deal of improvement in my health since our central heating broke down. My hypothisis is that some cooler air on a morning helps to gently stimulate the thyroid. I don think we are supposed to have a constant temperture. I think central heating make the thyroid sluggish.
My second thought is this that papatations when taking t3 might well be good for the heart occasionally. Good exercise and an indication of a good strong beat. My pulse used to be really thready it feel like the pulse I had a as a 18 year old tonight.