It looks like the effect of the polar vortex wobble will be hitting us Monday. Lower Michigan is schedule to hit -20F. It will be a wake up for many. The design temp for homes in this area is -13F. Modern high efficiency furnaces will have hard time keeping up. It's not like the good-ole days when furnaces had 50% greater capacity than needed.
Last edited by MM879; 01/26/19.
