Full replacement budgets reach $5,400 to $10,800 during typical 10 to 15 year intervals

https://precision247yearround.capitaljays.com/posts/deciding-between-repair-and-replacement-saves-thousands-on-ac-service-costs

Most HVAC systems need replacement every 10 to 15 years, with national cost data showing typical full-system replacement ranges from $5,400 to $10,800 depending on tonnage and efficiency ratings