The 5000 Dollar Rule Reveals When Your Furnace Operating Costs Demand Professional Assessment
https://storyvergey.com/s/7QB1pWGeT5Ipr8PmML_kd
The $5,000 rule is an efficiency-based decision framework: if your furnace's annual operating cost (calculated by multiplying its AFUE rating against your heating load and local energy prices) plus any repair bill exceeds $5,000, replacement becomes