Second floor system : Removed 1 heat 1 cool thermostat and installed 2 heat 1 cool heat pump thermostat. Installed TE Certified flood protection. Installed locking caps. Basement system : Sealed supply plenum with screws and mastic tape. Noticed no collar for 14 inch flex. Installed collar for flex. Main floor system : taped off return pulling air from mechanical room. This was un healthy and could be dangerous.