But AS MA-2, which is usually recommended with SL, produces 1600W of heat just on idle (2 Monoblocks together). Plus, it is >$20,000.Given the size of your room, if you are thinking of Atma-Sphere, my first recommendation would be a set of MA-1s rather than MA-2s. You don't need the power, and with changes that Sound Lab made in the last 5 years or so, the MA-1 can now do on the Sound Labs what took a set of MA-2s prior.
If you are planning solid state amps for Sound Labs, my first recommendation is Pass Labs.
But if heat really is the issue, then a very practical thing to do is to set up a simple and inexpensive set of ducts in or near the ceiling. They can be powered by a low RPM squirrel cage fan that can be dead silent. I've seen installations like this- one using our MA-3 amplifier, which has 42(!) power tubes in class A **per channel**- and yet the room stayed comfortable all day and all night with the amplifiers on. You might consider this, especially if you like the sound you are getting right now, since it only costs a few hundred dollars to implement.