80 degrees is fine, I maintain mine at 79 and bump it up to 80-81 in the summer.
those few degrees equals about $50-$70 a month on the electric bill from the chiller running. You don't need a chiller unless temps are getting and staying in the upper 80's.
the obvious culprit is going to be any pumps you have running as they are the only thing that will generate heat. Mine stayed ~80+ just from the mag drive pumps I was using. replaced the main return with DC
pump and using a Magnum 350 for additional circulation/filtration. Now if left alone my temps can drop into the low 70's easy.
Submersible pumps can generate a lot of heat.