Tech was out For no cooling on the main level system. Customer stated that they changed out thermostat due to system not keeping up. The following tech came across. System was dropping 24 V. Checked thoroughly and found thermostat wire broken some where in line behind wall . Other issues with system on furnace flue pipe is incorrect needs to be double wall. Heat exchanger has a crack, Gas connections are poor. We need to also add a sediment trap. Drain line needs to be cleaned. There is no evaporator coil safety switch. System needs a wet switch. There is a float switch, but this is outdated and needs to be replaced. Capacitor is rated at a 7.5 and it is failing blower motor is leaking. All this indicates bearings are going bad inside the blower motor. The blower wheel is needing to be cleaned. Outdoor unit is needing a deep clean chemically. Contractor is pitted and has burn marks. in order for the system to be up and running today we would have to run new thermostat wire or install a