Some assistance for heating and ventilating systems

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I am doing a model of an elementary school in Utah. Most of the school has furnace heating and no cooling. So I chose a Heating and Ventilating system for simulation. I actually boosted the T-stats to 74 DegF, as i could not get the gas usage high enough to match the bills.
But there are many space that show under heating. If i could get those spaces satisfied, i probably could lower the thermostat.
I am probably missing something obvious and basic. Can a further set of eyes give me a boost, please?
Files attached. Using 3.65, Build 7174. Using 2018 weather data provided.
John R. Aulbach, PE

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Joined: 2011-09-30
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