Uneven heating between rooms: a useful troubleshooting path

Start by comparing thermostat placement with the coldest room. Then check whether supply registers and return grilles are open, blocked, or noisy. A dirty filter, closed damper, disconnected duct, poor insulation, air leakage, and inadequate return path can all create uneven temperatures. Zoning may help, but it is not a substitute for correcting a crushed duct or an oversized furnace. Note the time of day, weather, room use, and whether doors are open or closed. A professional can measure airflow and room temperatures, inspect accessible ducts, and explain which changes are maintenance, ductwork, insulation, controls, or equipment decisions.