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Q & A: I have two furnaces in my house, what should they be set at relatively?

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.

Best answer:

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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2 Responses to Q & A: I have two furnaces in my house, what should they be set at relatively?

  1. Robert D

    This would depend on the outside temperature. If it is winter time, which is what I am going to go with, I would adjust the upstairs about 5 degrees lower than down stairs. The down stairs heater will lose heat to the upstairs, that amount will depend on the amount of insulation in the ceiling and the type of windows that you have. I am going to assume you have double pane windows and go with my original 5 degree, opinion. Heaters are designed to work for a certain square foot area, someone put in 2 heaters to utilize the zone heat theory and save some money. On slightly cool days, just use the lower heater.

  2. Kurtis G

    You’ll save money by turning down the thermostat. How long the living space will be out of use determines how much I turn it down.
    Heat rises, so the upstairs furnace will always be getting some assistance from the downstairs furnace. Don’t worry much about that.
    If the times of vacancy are the same on most days, I’d recommend a programmable thermostat. They rather costly in comparison, but will pay for themselves fairly quick. Nothing but savings after that!

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