https://innago.com/replacement....-reserve-spreadsheet
Each major property component has a finite lifespan. For example, roofs typically last 20-30 years, HVAC systems around 15-20 years, and flooring or appliances may need replacing after 10-15 years. Research the average lifespan of the key components in your property, factoring in the local climate and usage, to estimate when replacements will be needed. These estimates will help determine how much money needs to be allocated annually to the reserve fund.