Reddit mentions of HP Color Laserjet CP5525DN Printer

Here's the thing, A3 lasers are expensive. And on top of that, no printer will handle such temperature transitions well. Here is an older model HP CP5525, a solid unit commonly used by the clients of ours that need an A3 color printer. It's going to be pretty much the best possible choice, considering switching between heavy and infrequent use like you're describing. But cold is known to damage the organic material used in the cartridge drums, and the transfer belt. The good part is, units like these are pretty easy to move, and hold up to being boxed up and shipped well, so long as they have adequate packing. You might consider just bringing it somewhere else and storing it during the off time, to save yourself the replacement supply costs, or just resigning yourself to burning through cheap inkjets.