Sometimes yes, after a load calculation. Central air is not a surprise add-on in the optional-method structure; the cooling nameplate is entered and compared with heating, and the larger value is taken. The 100-amp all-gas walk-throughs on this site already include a 4,000 VA cooling example and still land under 100 amps with a 32-amp charger. A larger condensing unit, a second compressor, or electric heat in the same house can change that.
Educational contrast, still a 1,800 ft² example with a 32 A charger, now with a labeled 6,000 VA cooling nameplate instead of 4,000 VA:
| Step (2023-style optional method, educational) | Result |
|---|---|
| General lighting at 3 VA/ft² | 5,400 VA |
| Small-appliance and laundry circuits at 1,500 VA each | 4,500 VA |
| General load including listed nameplates and EVSE | 17,580 VA |
| First 10 kVA at 100%, remainder at 40% | 13,032 VA |
| Larger of the heating or cooling values entered, at 100% | 6,000 VA |
| Calculated load | 19,032 VA · 79.3 A at 240 V |
| Compared with this walk-through’s service rating | 79.3 A is under a 100 A rating by 20.7 A |
Educational walk-through of the optional dwelling-unit method structure in NEC 2023 220.82. Not a permit calculation. 220.82(C) heating/cooling selections can be more involved than “the larger of two numbers,” especially with heat-pump backup strips.
That walk-through is about 79.3 A. The same house with a 48 A charger is about 85.7 A. Both are under 100 A here, and both are examples — read the RLA or FLA on the outdoor nameplate rather than copying 6,000 VA. If the lights already flicker when the compressor starts, have an electrician look at voltage drop and connections before you add a continuous 7.68 kW load; that symptom is on its own page. Use the calculator.
This is not a permit calculation, a utility approval, or a substitute for a licensed electrician, HVAC contractor, or the authority having jurisdiction. Panel Headroom is an independent educational site. It is not a utility, a certification body, or a contractor. Electrical and generator work that is done incorrectly can cause fire, shock, or carbon monoxide poisoning. Use the adopted electrical code and manufacturer instructions; pull permits where required.