Question by Brett P: I have two furnaces in my house, what should they be set at relatively?
The furnace for the finished basement and main floor is a 93% two stage that has a solar assist unit connected to it. The furnace for the 2nd level of the house is a 85% two stage unit. Should I turn down the furnace to the upstairs when not up there, or leave it set to the same temp as the main floor? The reason I ask, is I suspect if the upstairs becomes cooler, it will draw the warm air upstairs and the furnace for the main two floors will have to indirectly heat the upstairs.
Answer by RICH @www.hvac-for-beginners.com
No matter what you do the main floor furnace indirectly heats the second level. The best thing to do is to replace the thermostats with programmable units. Then set the temp back 5-10 degrees when you are not home and at night. For more info check out my source.
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