This is not an area I can speak to with authority, but considering nobody has responded I'll put in my two cents, especially since this is an extremely common warning and most of us have trained ourselves to ignore it for better or worse.
- Cooling during periods of time when it is cold outside is very possible in load dominated commercial buildings. Don't think just because your cooling coil is on when it is cold outside means something is wrong with your control.
- You might consider using an economizer to keep the coil from running during some of these hours.
- Real coils might have mechanisms to prevent coil freezing (reverse cycle or resistance heating), CoilCoolingDXSingleSpeed is not capturing this so you might be underestimating energy consumption a little.
- At the extreme you might be dropping off the valid range of the coil performance map. Perhaps overestimating energy consumption of the vapor compression cycle a little.
