I have hives in Nambour & Highworth on the Sunny Coast as well as hives in Brisbane, Ippy & Toowoomba.
I don't feed in any of my sites.
Depending where on the Coast your are, I would suggest you have your hives in Full Sun. I run dark blue brood boxes, and in winter run 2x frames full of honey each side of the brood over winter. (the honey asorbs heat through the day & returns it during the night)