True class A burns full power all the time, and even if it's cool to the touch due to large heatsinks, it's still using that power and dissipating it as heat in the room.
I've read that the newest Mola Mola classD monos are even better than their well reviewed prior amps. GTT might do an in house audition like they do for the Tambaqui. Everyone keep in mind the power our systems draw wrt to climate change. My ML-532H sounds great and "only" draws 80w at idle, so it's quite cool. It's also very low noise and low distortion but at 300w it may be too much power for the OP.
Please write a follow up post telling us what you auditioned and went with. My next amp will probably be a GaN class-D mono to reduce the power draw.