Customer stated they had no heat in front of house apartment, system was off upon arrival, had customer turn system on, out of the 10 vents only about half of them you could feel air flow from, system is one zone controlled by thermostat on first floor, went to basement to see ductwork which is a very long run that then goes up the wall, it’s a oil fired furnace and just doesn’t have enough air flow to push the air, would recommend adding mini splits to second floor instead of ripping through walls to try and zone system but we can give a estimate for both, also in back of house apartment tenant complaint was a musty smell and could see basement floor, the return duct is cut too short could add a return plenum extension so it could seal off duct and smell from basement would be gone.