Hello, I have been having a discussion about this problem and would like to know if I am correct and if I can fix the problem. I have a six room ranch house. I have one zone with a circulator and separate thermostat for a den which is approximately 25'X25'. I also have a separate thermostat for the rest of the house. It seems to me that when I have the thermostat in the den set at 68% and the rest of the house at 68%, the two circulators never call for heat at the same time, therefore the furnace is running twice as many times to heat both zones. Should I go back to having one zone? Help!!! Thank you. I look forward to an opinion or a solution.:confused::rolleyes:

The system seems wired wrong. Some documentaion for zoning with Taco vales is here:

TACO - HVAC (http://www.taco-hvac.com/en/products/Zone+and+Flow+Control+Valves/products.html?current_category=66)