Product prorate calculator Property name Building Unit # Date installed Product lifecycle 36 months (3 yr) 60 months (5 yr) 72 months (6 yr) 84 months (7 yr) 120 months (10 yr) Custom Months of residence Original cost of install ($) Lost life on product 0 months Prorated cost / month $0.00 TOTAL DUE $0.00 Download Prorate Statement (PDF)