It was about 30 degrees colder than normal here. I underestimated when buying a heater. It worked too hard and the auto shutoff engaged, sending my greenhouse down to around 28. I lost nearly every tropical plant I had overnight. Broke my heart. I had heliconias, bird of paradise, cinnamon tree (it is a struggling little stick now, trying to come back), cardamom, turmeric, ginger, galangal, many others. Only the pineapples and cacti came out unscathed.
Once I get projects outdoors completed, I'm going to tackle the greenhouse retooling. More (or better) plastic, better insulation, better heater - some of those, all of those, who knows? I have all summer to figure it out and try again. And maybe Mother Nature will not beat the hell out of us next year.