I recently decided to replace my furnace with a heat pump. I had heard that heat pumps were far more energy efficient and less costly to install than a furnace. This all turned out to be true, and I was quite pleased, anticipating that my energy bills would be lower and that my house would still be perfectly warm in the winter.The first time that I decided to use my heat pump was in late November, when the temperatures really started to dip and winter was on its way. I was completely unfamiliar with how heat pumps operated, and when I turned it on, I was quite confused. It seemed to me that the air blowing from the vents was cold, not warm. I was perplexed as to what the problem might be. After waiting a good long while, it seems like the house actually did warm up, but it apparently took some time. I was used to a rush of hot air warming things up much faster with the furnace I previously owned. Although the temperature was actually pleasantly warm after a while, I still figured there may be something wrong. I decided to call out an HVAC serviceman to see why the heat pump was sending out air that was cooler than I was used to when it came to central heating.The HVAC service man eventually came to the house and explained that heat pumps work a little differently from furnaces. Furnaces tend to put out air that is easily between 130 and 140 degrees Fahrenheit. Heat pumps put out air in the low 90s or even the high 80s. Heat pumps simply run longer than furnaces in order to reach the thermostat temperature by using cooler air over a longer period of time.