Good point, Resultant64 ... but here in the desert, we don't have to do that much heating ... maybe the heaters run for about a month, if that. I failed to mention too that besides being upstairs, the Swell division is right against an uninsulated Western wall ... well, there is the usual formica covering the concrete blocks, but that doesn't afford much relief from the afternoon sun beating on that wall.
The other problem we face (which is why we cool the church during the week) is that when the air temperature inside the chest gets too warm, it expands ... expansion causes the wind pressure to rise slightly, thus overblowing the pipes and making them sound sharp. We use piano and organ in our contemporary service, and today, being unusually hot in the sanctuary, the organ went way sharp, and the piano went flat ... it got so bad, I had to stop playing.