Does the ac unit use c wire because I’m deciding on what kind of thermostat to buy?

Thank you for your question. Yes, this system has a c terminal for common power. We have several compatible thermostat options, which we would recommend. These thermostats can be purchased separately as an accessory. We have a Honeywell T6 Pro Wi-Fi Thermostat- 3H/2C, an Ecobee Smart Wi-Fi Thermostat with Alexa and a Braeburn 2 Heat / 1 Cool Universal Programmable Thermostat. These recommended thermostats can be found with the other product accessories on this product page. The accessory section is beneath the "add to cart" button. For more assistance, please give us a call.