Noncoincident Loads: Larger of Heating vs A/C (NEC 220.60)
Applies NEC 220.60: where two loads (electric heat vs air-conditioning) are unlikely to run at the same time, the service calc carries only the larger and omits the smaller; the exception adds both where they operate simultaneously (a heat-pump compressor with supplemental strip heat). The AHJ judges noncoincidence.
Formula and source
counted = both_can_run ? load_a + load_b : max(load_a, load_b); omitted = both_can_run ? 0 : min(load_a, load_b).
Noncoincident loads, NEC 2023 220.60, with the simultaneous-operation exception, by name.
Audience
This tile is built for electricians and the adjacent professions in the Electrical group. The interactive calculator runs entirely in your browser. No account, no fee, no advertising, no tracking.
Related tools
Posture
Rough Logic answers the math question the working professional asks on the job. The site is a calm, fast, ad-free, account-free, ever-free reference. It does not interpret code. It does not replace the licensed professional. It does not store your inputs. The Authority Having Jurisdiction governs all installations and inspections.