Wellholt prices a straightforward job from a national starting point, then adjusts labor for your city. Materials barely move. You get a low, a typical, and a high — not one fake average.
Low is the easy version of the same job. Typical is that job in the example home on the city page. High is the same machine with worse access, a code fix, or a second trip. A different scope is allowed to sit outside the range.
Climate comes from the IECC zone and from heating and cooling degree days. The room BTU calculator multiplies square footage by a zone factor, a window factor, and an insulation factor, then adds people and a kitchen. It is a sketch, not a Manual J.
Circuits count loads that can run for hours at 125 percent. Rents are planning figures, not listings. Electric rates are for the monthly bill, not your tariff. A city page needs its own zone, degree days, labor, rate, housing year, rents, source, review date, and a local note about that place. Nobody pays to move the typical price.