Pretty much you are unable to continue with construction or a project without an HVAC appointment. Engineers will come with reading meters to your home or business along with an inspector. The inspector will read the pre-approved calculations by the city for each air duct. The numbers will be compared both to the meter and the city blueprint. You have a percentage of leeway. We sign the paperwork on the site. Normal service time is today. If you call, we go. Call today.