AEP Texas is the regulated transmission and distribution utility — the company that owns the poles and wires — for the Coastal Bend, including Corpus Christi, and for the Laredo and Rio Grande area. Even in deregulated Texas, where you buy electricity from a retail provider, the energy-efficiency programs are run by the wires utility, so Corpus Christi homeowners use AEP Texas programs regardless of who bills them for power.
AEP Texas's residential portfolio lists A/C system duct testing and sealing as a covered measure, delivered through the Residential Standard Offer Program. A Standard Offer program works differently from a flat rebate: AEP Texas pays an incentive to an enrolled contractor — an Energy Efficiency Service Provider — based on the energy savings the project is measured to deliver, and that benefit is passed through as a lower project cost. Because the payment is tied to measured savings rather than a fixed equipment rebate, there is no single dollar figure to quote up front; the enrolled contractor prices the job with the incentive applied. Lower-income households can qualify for the Hard-to-Reach Standard Offer Program, which carries a higher incentive for the same kind of work.
One common point of confusion: AEP's SMART Source program is a residential solar incentive, not duct sealing — the two are unrelated, so ask for the Residential Standard Offer Program by name. Duct sealing is also separate from duct cleaning: sealing closes leaks to cut energy waste and improve comfort, while cleaning removes debris; AEP's incentive is for the efficiency (sealing and testing) side. Programs run on an annual budget and can change year to year, so confirm the current measure list and contractor requirements before scheduling work.