In the fall, a drop in temperature of even a few degrees can turn an outdoor dinner party into the Donner party (without the extreme measures). An outdoor mini-heater — a scaled-down version of the ones found at garden restaurants — can rescue you. The now affordable heaters, which run on propane or natural gas, are more effective and portable than electric models and outdoor fireplaces. Real Simple likes the Endless Summer Table Top Patio Heater (shown here; runs on propane; 36 inches high, 14-inch base, $180, www.kmart.com). It's powerful enough to warm people within a 10-foot radius and so quiet it won't interfere with the conversation.