Sun MIGHT help a new bin get started but after that They are pretty much self heating. I don't lnow your climate but here in the mid south we have to leep it moist in the summer [hot dry]season} but if too wet it will start to stink. Frankly I took my longest hose and used that as an arc [I didn't want to be able to smell it] did the same from the garden spot and the chicken house and placed my bins where the three arcs crossed one did end up under a tree and frankly I couldn't tell and difference between the bins. but my chickens liked to hang out on the shaded one {maybe for Hawk protection] ~gdShould compost bins have a certain amount of sun?? Would it be OK to have one in a shaded area. I am in NH and growing season is pretty short so I'd like to try to get really good soil.
Ditto! Just what I would suggest. Break the composter open if you can, add the manures as you replace the compost material. If it is wet, it is probably frozen. In that case you will have to wait a bit before you can disrupt the compost.Add some manure and old bedding, that should get it heated up a bit.