Home inspection on one system, 13 years old located in crawl space. Inspected entire system. Heat exchanger is rusted, with some heavy hot spots and compromised. Didn’t find any crack at this time, but it can occur anytime. Flame sensor and igniter are weak, single capacitor very weak (reading 2.2 on a 5.0 microfarad), dual capacitor getting weak also (reading 44 on a 45 microfarad), blower wheel very dirty and system is low on Freon (possible evaporator coil leaking). Outside condenser in needed to be chemically washed. Sent estimates for potential repairs (not recommended), however, at this age and conditions, highly recommend to upgrade the system, with a 10 year warranty and WiFi thermostat. Current system has single speed blower motor, and new systems come with variable speed motor, that helps to control the humidity in the house, to save energy and make house more comfortable. Set a lead to quote upgrading for today. We should credit back 139,00 spent today, if customer upgrade