AC Not Cooling Your House Evenly
Some rooms in your home feel comfortable while others stay warm, stuffy, or noticeably warmer than where the thermostat is located. You may notice the rooms farthest from the indoor unit, or rooms on certain sides of the house, never quite reach the temperature you set.
What You Are Experiencing
Some rooms in your home feel comfortable while others stay warm, stuffy, or noticeably warmer than where the thermostat is located. You may notice the rooms farthest from the indoor unit, or rooms on certain sides of the house, never quite reach the temperature you set. This is one of the most common comfort complaints we hear from Piedmont NC homeowners, especially in homes built before 2000.
Common Causes
Undersized or leaky ductwork
Many older North Carolina homes have duct systems that were designed for less powerful equipment or have developed leaks at joints and connections over time. Conditioned air escapes into crawl spaces and attics before reaching distant rooms.
Blocked or closed supply vents
Furniture, rugs, or closed registers in certain rooms restrict airflow. This is a simple fix but is often overlooked.
Single-zone system in a multi-level home
A single thermostat can only measure temperature in one spot. Rooms far from the thermostat, especially upstairs, may not get enough cooling before the system shuts off.
Dirty air filter restricting airflow
A clogged filter reduces the total volume of air your system can push. Rooms at the end of long duct runs feel it first.
Improper system sizing
An oversized AC cools the area near the thermostat quickly and shuts off before distant rooms reach temperature. An undersized system simply can't keep up on hot days.
When to Call a Professional
If you've checked your vents and replaced your filter but certain rooms still won't cool, the issue is likely in your ductwork or system sizing. These require professional diagnosis with airflow measurements and static pressure testing. A trained technician can identify exactly where conditioned air is being lost and recommend targeted fixes, not a full system replacement.
How We Fix It
We start by measuring airflow at each supply register and comparing it to the system's total output. This tells us immediately whether the problem is ductwork, equipment, or both. For duct issues, we seal leaks, add insulation, or modify runs to balance airflow. For sizing issues, we discuss options ranging from zoning dampers to supplemental ductless units for problem rooms.
Related Services
Frequently Asked Questions
Can closing vents in unused rooms help cool other rooms?
No, closing vents increases static pressure in the duct system, which can reduce total airflow and cause other problems. It's better to keep all vents open and address the root cause of uneven cooling.
Will a bigger AC unit fix uneven cooling?
Usually not. Oversizing actually makes uneven cooling worse because the system short-cycles, cooling the thermostat area quickly and shutting off before distant rooms reach temperature. Proper duct design and airflow balancing are more effective solutions.
How much does it cost to balance ductwork?
Duct balancing and sealing typically costs $300–$1,500 depending on accessibility and the extent of the issues. We provide a clear quote after inspection. Call 336-357-5583 to schedule.
Talk to a Technician
Call Davidson Heating & Air at 336-357-5583. Serving homes and businesses since 1984.