Today, new furnaces are generally between 85-98% efficient. If a furnace is 96% efficient, it simply means that 96% of the energy that goes into the furnace is converted into heat. Older furnaces in 30+-year-old homes, can be as low as 60% efficient. Thus, upgrading to a 96% efficient...
furnace
Single Stage vs. Two Stage Furnace
Most furnaces either have all of their burners lit or all turned off. However, over 80% of the time, it is not necessary to have all of the burners of the furnace lit to meet the heat demands. Having all of the burners lit when it is not necessary...
