Take the 2-minute tour ×  We have a bi-level (tri-level? There's
a small entry way and utility room, then an upstairs living area
and master bedroom and a downstairs living area with bedrooms)
in mid-Michigan.  The downstairs is naturally quite cooler than
the upstairs, but during the summer we were having keeping the
downstairs warm enough for our young son. We didn't want to
raise the temp upstairs anymore but our local HVAC person
suggested running the system fan continuously to help evenly
distribute the air. And it worked. He did say that it shouldn't
increase our costs that much and searching online seemed to come
to the same conclusion. Our electric bill did end up higher than
previous years but I chalked that up to higher-than-average
weather temps, we were keeping things a little cooler than we
had in the past due to our child, and summer electricity rates
were in effect.  Now that we're getting into Winter, we just
received our latest bill and it's again abnormally high. We did
cut the fan usage som