I performed a detailed inspection on the furnace,ac and coil. House has a bonus room that was locked. It is not on the central hvac system and has a window unit I couldn’t test. Repairs that I found will be included in the estimate. I found the outdoor unit has a dirty condenser coil. The coil will need to be cleaned to restore proper efficiency and to adjust the refrigerant charge. The system is also one to two pounds low on 410 a refrigerant. I’m including an electronic leak search to be performed to find the source of potential refrigerant leak. If no leak is found we do not charge. There is also a double wall elbow at the furnace that must be replaced. Due to flue pipe issue from roofer that was fixed by another company today. This caused excess condensation to drain back to the furnace corroding the elbow at the furnace. The system is currently cooling but with a low refrigerant charge the sytem will freeze up when temperature loads drop on the system. There is an old furnace