Today our electric heater began blowing cold air during one of the cycles. It has been around 30* all day outside and we have kept the heater at 70*. The heater had been running about 7 min. when I noticed cold air blowing so I switched to emergency heat and the air felt slightly warmer but still very cool. I turned it back to the normal heat setting and the furnace turned off, and the thermostat showed "wait" and it was off for a minute or so and it came back on blowing hot air. We are fairly new in this home so I am very unfamiliar with electric heaters and heat pumps. I had the heater checked recently and everything was fine. Im just concerned if the blower would have kept blowing cold air until someone jacked with the thermostat, and i know a tech would be unable to diagnose anything if it is working properly while he is here. It has been working normally since then. Any help would be greatly appreciated.