What's the right temperature for your thermostat when it hits 90? What experts say

With temperatures are expected to hit the mid 80s to upper 90s this week , DTE recommends Michiganders set their thermostats to 78 degrees — and raise it a few degrees when you're not home.

The highest temperatures in Michigan are expected to hit 90 in Detroit while the lowest, 71 degrees, are predicted for Marquette .

The U.S. Department of Energy recommends keeping indoor temperatures comfortable, at a level that provides humidity control.

"You can save as much as 10% a year on heating and cooling by simply turning your thermostat back 7 to 10 degrees for eight hours a day from its normal setting. The percentage of savings from setback is greater for buildings in milder climates than for those in more severe climates," DOE says.

Residents should aim to keep the difference