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A GreenBuildingAdvisor report says radiant cooling can be practical in humid climates, particularly in well-insulated new homes, but it cannot replace humidity control. Radiant panels or slabs must stay above the indoor-air dew point, while a separate dehumidifier handles moisture; system performance and cost depend on the home and design.
Radiant systems cool people and rooms by lowering the temperature of floors, walls or ceiling panels. The report explains that the body exchanges heat with its surroundings through radiation, making the temperature of surrounding surfaces part of how comfortable a room feels. Hydronic tubing also takes up less space than conventional air ducts, though the report’s author presents potential indoor-air-quality advantages over ducted systems as a possibility rather than a guaranteed outcome.
The central constraint in humid weather is the **dew point**. If a radiant surface falls below the temperature at which moisture in the air condenses, water can form on it. The report gives an example: at **75°F and 65% relative humidity**, the dew point is about **62°F**. It says radiant-cooling professionals commonly recommend keeping surfaces at **65°F or warmer** in humid climates, leaving a limited temperature difference for cooling.
That temperature limit does not remove humidity from a home. The report says a humid-climate radiant system needs a **separate dehumidifier** or another means of controlling moisture; radiant panels handle sensible cooling, or lowering air and surface temperatures, rather than the latent load of removing water vapor. The report estimates **15,000 to 25,000 Btu per hour of cooling per 1,000 square feet of panel area**, and says that capacity can be adequate in new homes with low cooling loads. Those figures are estimates, not a performance guarantee for any particular house.
Humidity Control Sets the Limits
The distinction between temperature control and moisture removal matters for homeowners weighing radiant cooling against conventional air-conditioning. A radiant system may provide comfortable cooling without extensive ductwork, but **it is not a stand-alone humidity solution** in a humid climate. Omitting dehumidification can leave indoor moisture uncontrolled and increase the chance of condensation on cool surfaces.
That affects both system design and household costs. A homeowner must account for the radiant equipment and for **independent moisture control**, along with controls that keep surfaces safely above the dew point. The report suggests the arrangement is more likely to meet a home’s cooling demand when the building is efficient and has a modest sensible load; the same conclusion cannot be assumed for every existing home or climate.
How Radiant Cooling Works
Radiant cooling uses cooled water circulated through tubing in a slab or through panels on walls or ceilings. Rather than relying entirely on cold air blown through ducts, it cools nearby surfaces, which then absorb heat radiated from people and objects. The source report points to radiant heating and cooling panels at **ASHRAE’s Atlanta-area headquarters**, photographed by its author at a 2021 ribbon-cutting ceremony, as an example of the technology in use.
In dry climates, the report says, condensation risk is generally less of a concern because the air contains less moisture. Humid climates require a different approach: indoor humidity and the temperature of the cooling surfaces must be managed together. The source also notes that air-conditioning often provides some dehumidification, while radiant panels alone do not perform that function.
““If all you do is install a radiant-cooling system instead of air-conditioning, you’re in for trouble.””
— GreenBuildingAdvisor report
Performance Depends on the Home
The report’s capacity estimate does not establish how a particular radiant system will perform. Results depend on factors such as the home’s cooling load, panel area, water temperature, indoor humidity and controls. The source excerpt also does not provide a full cost comparison with conventional air-conditioning or quantify the energy use of the added dehumidifier.
It is also not clear from the report whether radiant cooling is economical for existing homes with higher cooling loads, or what equipment and control strategy would be appropriate for a specific property. The 65°F surface-temperature recommendation is presented as a general guideline, while actual condensation risk depends on the air’s dew point and conditions in the home.
Evaluate Loads and Moisture Controls
Anyone considering radiant cooling should have a qualified HVAC professional assess the home’s cooling load, expected indoor humidity, radiant-panel capacity and dehumidification needs before selecting equipment. The system design should include a way to monitor or otherwise manage humidity and keep cooled surfaces above the indoor dew point. The report does not announce a new product or policy; it offers guidance on evaluating the technology.
For an individual home, the next step is a project-specific design and cost review, including how the system will perform during humid periods and what happens if humidity controls fail. The report’s broader conclusion is conditional: **radiant cooling may make sense**, especially in an efficient new home, but only as part of a design that also controls moisture.
Key Questions
Can radiant cooling work in a humid climate?
Yes, according to the GreenBuildingAdvisor report, but the system needs **active humidity control** and must keep cooled surfaces above the indoor-air dew point to reduce condensation risk.
Does radiant cooling remove humidity from the air?
No. Radiant panels or slabs mainly provide sensible cooling. The report says a humid-climate home needs a **separate dehumidifier or another moisture-control system**.
Why can radiant surfaces develop condensation?
Condensation can form when a cooled floor, wall or ceiling surface is colder than the air’s dew point. The report’s example puts the dew point at about **62°F** when indoor conditions are 75°F and 65% relative humidity.
Is radiant cooling suitable for an existing home?
It may be, but the report does not establish that it will work well in every existing home. Suitability depends on the home’s cooling load, available panel area, humidity levels and the design of its dehumidification and controls.
How much cooling can radiant panels provide?
The report estimates **15,000 to 25,000 Btu per hour per 1,000 square feet of panel area** under typical conditions. It presents this as a general estimate, not a guaranteed output for a specific installation.
Source: rss
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