In the current Lair, I don't use any ventilation or A/C.
Here, in Belgium... we maybe have 20 days per years with hot temperature : I mean upper than 28° Celsius (82° Fahrenheit for you) ... so I really don't need an Cold A/C

During some hot day, I use to let the door open, and the small windows at the back of the room in order to refresh the air, and avoid any bad smells by the way

So the bad thing about the Belgium weather ... it's very cold

So I use an electric radiator up 24h on 24h, 7 days per week, and 12 months per year ...set to warm at least 14~15° Celsius (approx 60° Fahrenheit) which is more than fine your our old games

Sometime my wife is not happy... because the game room is more warm than some rooms in our house in winter

...ArcadeLifeStyle all the way

I thing I'll buy a new radiator for the v1+v2 ... more powerful by also more economical too (electricity is so expensive nowadays

)