For supplemental heating, major inputs are:

(1) OA temperature below which supplemental heating is allowed

(2) OA temperature below which the heat pump is turned off

The first is to be set at 40?F per Appendix G: Section G3.1.3.1 - Heat Pumps (Systems 2 and 4).

I do not seem to find anything on which value to set the second at. The default eQuest value is also 40?F, but heat pumps can operate at less than this temperature.

Is there any guidance over there?

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Demba NDIAYE