"...get yourself one of those small computer fans and for a few dollars, your tubes will run cool and you’ll extend tube life too."
As much as the tubes may run cooler, the amount of heat in the room will stay the same, I think (theoretically even higher due to fan operation heat). It would not solve the OP’s problem.
"We have a number of customers that have their amps installed in the basement beneath their listening room, near the ceiling so the speaker cables can be kept short."
Very economical and environmentally-friendly version of what is usually called "floor heating".