The difference (loss) between SSE and AFUE is intended to cover this effect, provided the equipment is sized correctly (almost never done and almost always at l

The difference (loss) between SSE and AFUE is intended to cover this effect, provided the equipment is sized correctly (almost never done and almost always at least 50% oversized, leading to short-cycling and greater spread between SSE and actual fuel use [meaning AFUE is overstated]). That might give some terms to Google and find additional data. Peak COP’s equivalent is closest to SSE; SCOP is closest to AFUE.