Hot and cold rooms / uneven temperatures

Airflow

AirCompDX - Field Reference for Air Compressor Techs
All HVAC symptoms
1

Duct balancing / register dampers

low
CheckMeasure register CFM with anemometer or capture hood.
FixBalance dampers; add takeoffs to starved rooms.
2

Return-air starvation in bedrooms

low
CheckDoors closed reduce return path.
FixAdd transfer grilles or jumper ducts.
3

Leaky / uninsulated duct in attic

med
CheckIR camera or hand check duct temps.
FixMastic-seal joints, R-8 wrap.
Safety

Pull the disconnect and lock out before opening HVAC equipment. Discharge dual-run capacitors before handling. Refrigerant recovery and brazing require EPA 608 certification and proper PPE.