The expression “variable speed furnace” really alludes to the blower engine in your heater, which controls the wind stream in your home. Dissimilar to a single speed motor, which can just work at one speed, a variable speed motor can work at an extensive variety of paces, contingent upon the requirements of your home.
As your heater warms your home, a variable speed motor screens incoming data to choose how quick or moderate the blower needs to move. When you have a filthy air filter, for example, a variable speed furnace can run at a higher velocity to adjust for the loss of air flow. The point when your filter is clean, it can run at a slower speed so as not to unnecessarily waste energy.