Recently with wintery sub-zero temperatures outside, Mark found his house with a broken furnace. While the HVAC guys were tearing out the old and installing the new, Mark was calculating the actual ‘lost opportunity cost’ of a furnace, it’s yearly maintenance, the ongoing expense of natural gas, the impact of inflation and what would that money might have provided for his family’s future economy to determine of the real cost of heating one’s home over the next two decades.