Do you have separate furnace controls from your heat pumps? My thermostat controls my ac's, hp's, furnaces, and fans. In Auto position it switches between cool, and heat as needed. My hp's only work to about 37 degrees and then it auto switches over to the furnaces. I can't operate my hp's and furnaces at the same time. I only have the duo zone thermostat for control. When my furnace first kicks on it actually blows cold air until the furnace gets up to temp--about 1 to 2 minutes, but then it is blasting hot air. Ion, I could run one zone on hp and the other zone on furnace, but I can 't run both zones on both hp and furnace.
CMSgt, USAF ret.
2012 Canyon Star 3856//2017 Corolla SE