SerpApi.Org
A cooling-system overhaul appeared to fix a Long Island home's summer comfort issues — except for one bedroom in an addition that still runs 4 to 5 degrees hotter than the rest of the house.
What's happening?
Air returns to the system through one 31-by-31-inch grille in the hallway ceiling, while ceiling supplies serve the rest of the house. That setup cools the main floor of the homeowner's 1,900-square-foot ranch, which got a new 3-ton Bosch BOVA split system two years ago and is configured as a single zone.
The homeowner told Reddit that the equipment has "worked great everywhere except the teen's bedroom," and the commenters looked to determine how air is moving through the home.
One point came up repeatedly in the discussion that a single central return can't circulate air well when rooms have closed doors, with one Redditor writing: "One. Return. How is the system supposed to remove all the heat from the house when it only pulls from one single point? It pushes in 16 registers, pulls from one. Think about that."
Another user suggested a targeted solution: "Put in a small window unit or portable AC. With that kind of exposure, a return there will do next to nothing."
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Why does it matter?
That bedroom is in an addition, has windows on both the north and south sides, and is bounded by three exterior walls. Together, those features can make the space harder to keep cool than the rest of the home.
Homeowners can mistake uneven temperatures for a failing AC unit when the real issue is duct design, insulation, sun exposure, or room pressure. If one bedroom stays hot, people often decide to lower the thermostat for the entire house, which can drive up utility bills without ever fully fixing the sweltering room.
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What can I do?
Commenters offered a few common ways to improve the room's airflow. Suggestions included adding a supply near an exterior wall, installing a return in the bedroom, improving the air path with a transfer grille or door undercut, or giving the space its own small mini-split if it effectively acts like a separate zone.
Others said to rule out simpler heat sources before paying for ductwork. Redditors pointed to afternoon sun, thin attic insulation over the room, having ceiling fans spin counterclockwise, and even a teen's gaming PC as possible contributors.
Cost may be less of an obstacle in this case, since the homeowner said a future son-in-law in HVAC had offered to handle the work for the cost of materials.
Using EnergySage's resources can help you find an HVAC option that effectively cools all rooms of your house, without dealing with the problem of one room staying uncomfortably hot.
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