300 lapsed PMA holders. Nobody's calling them.
Your HVAC shop has 300 customers with expired Preventive Maintenance Agreements — they paid you $200/yr at some point and quietly stopped renewing. Each one is worth $400+ in lifetime value if reactivated. Stack6 mines them out of your CRM, scores by recency and prior responsiveness, and sends a seasonal win-back ahead of pre-summer demand. 4–6% reactivate per month.
12–18 PMA reactivations/month at $200/yr each + the install pull-through when the unit fails. ~$4,800/yr in PMA revenue plus the system replacement flow.