Unlike previous thermostats, my Braeburn 2200 will not produce aux heat when the aux heat option is chosen. The circulated air seems to be the air in the home without any heat added even when the inside temp is below the set temp. If I run the set temp up 5 or so degrees, the aux heat does come on. This seems like an unnecessary step to get a quick warmup and was not required on my previous heating systems. Is this correct for the modern digital thermostats