If you’re not feeling the warmth, HVAC experts say you may need to switch the mode on your thermostat. Many thermostats have a setting called EM heat, emergency heat or auxiliary heat.

Aprilaire also offers a handful of thermostats, and a few of them are smart. The smart models include the 8920W, 8910W, 8620W, and S86WMUPR. For the most part, Aprilaire products have one of two ...