Rooms are unevenly heated or cooled

Some rooms are noticeably warmer or cooler than others.

Comfort

normal

Background

Heating and Cooling Load Basics
Concept
What a load calculation accounts for, and why sizing from square footage or the old unit causes problems.
Zone Valve and Zoning
Component
How zoning delivers heat only where it is called for, using valves or multiple circulators.
Duct Design and Airflow Delivery
Concept
Sizing, friction, fittings and the reasons a duct system fails to deliver what the equipment can produce.

Local Code Notice

HVAC installation, venting, combustion air, ventilation air, gas piping, clearances, termination locations, electrical requirements, permits, and equipment requirements vary by jurisdiction and equipment. Always verify the applicable local codes, adopted code edition, regulations, permits, and manufacturer installation instructions before installation or service.