System Replacement Timing — 10-yr vs 15-yr Decision

5-factor decision matrix

Check: **5 factors**: ① **Age** = <10 yr repair, 10-15 user decides, 15+ replace. ② **Refrigerant** = R-22 → replace (2030 ban), R-410A → 5-10 more yr, R-32 → new. ③ **Compressor** = insulation ≥1MΩ + current within ±10% = OK; else replace. ④ **Power consumption** = nameplate ±10% OK; over = inefficient → replace. ⑤ **Repeated repair** = 2+/yr → consider replace (cumulative repair > 50% of new). **Replace signals (≥4)**: hard compressor start, leak each season, energy bill doubled, cabinet corrosion progressing, parts discontinued.

What to do: **Comparison quote table**: ① Current system = avg operating ₩300k/yr, remaining life 3-5 yr, cumulative repair ₩500k+. ② New R-32 1st grade = install ₩600k-1.5M, avg operating ₩200k/yr (30% saved), life 15 yr, ROI 5 yr. ③ Environmental: R-410A vs R-32 GWP 1/3, R-454B compatible for 15+ yr. **Decision support**: ₩30k trip fee covers '5-factor + comparison quote' PDF (dispute prevention). 'Not deciding now' user → revisit in 6 mo (trackable).