Adds R-410A refrigerant to a system that's running low. If it keeps going low, you have a leak (see below) — recharging without finding the leak is a temporary fix.
Sorted by total cost — service call plus repair.
If the diagnosis turns up something not in the price book, the contractor will send you a written estimate through the app before they start any work. You approve, decline, or ask questions. No approval, no charge beyond the service call fee.