Highly social, Prairie Dogs live in large colonies called âtownsâ and in collections of families that can span hundreds of acres. A Prairie Dog town may contain 15 to 26 family groups, made up of a series of burrows with mounded entrances. Mother Prairie Dogs provide most of the care for the young.
BTU, or British thermal unit, is the industry-standard used to measure the heating efficiency of furnaces. In addition to BTU ratings, furnace manufacturers might include a Manual J Load rating and a percentage of energy efficiency.
A BTU is a British Thermal Unit, or a measure of thermal or heat energy. BTUs are used to determine thermal energy output in a variety of devices, including furnaces.he heating degree-day calculation for a furnace is 50 x heating therms x furnace efficiency = load in BTUs/hour. Your furnace must produce a certain load, measured in BTUs per hour, to heat your home.