Advantages of hydronic radiant cooling

15 September 2026
Advertorial

– advertorial –

With average temperatures rising and extreme heat waves becoming more frequent, the demand for indoor cooling has skyrocketed. However, the growing reliance on conventional solutions, such as split-system air conditioning, underlines the need to reevaluate their cost efficiency and environmental impacts. We talked with Ivan Milenovic, Pipelife’s expert on heating and cooling systems, about energy-efficient alternatives to convection-based cooling and what customers should expect from 21st-century HVAC solutions.

What is radiant cooling and how it works

While hydronic radiant heating solutions are recognized among homeowners for their improved cost-efficiency and comfort levels compared to convection-based systems, it is less known that the same hydronic technology can be used in reverse.

Radiant cooling systems operate by circulating cold water through pipes embedded in ceilings, walls, or other surfaces. The process is called radiant heat transfer, as the cooling surfaces directly absorb heat radiated by people and objects rather than blowing cold air toward them.

“When AC is on, the temperature is lower in the direction the air is blown compared to the rest of the room — creating unpleasant cold spots,” explains Ivan Milenovic, Business Development Manager for Heating and Cooling at Pipelife. “With radiant surface cooling, the temperature distribution inside the room is more even, and we perceive it as more comfortable.”

Key advantages of hydronic radiant cooling

While radiant systems are often selected by homeowners for their lower running costs, these solutions offer many additional advantages over split-system air conditioning:

Excellent energy efficiency: Water transfers thermal energy about seven times more effectively than air, so radiant systems consume less energy to achieve the same indoor comfort levels. By relying on radiant heat transfer, these systems provide a more even temperature distribution, allowing occupants to remain comfortable at indoor set points about 2–3°C higher than those typically used with traditional cooling methods. For most homeowners, this translates into reduced energy bills.
High indoor comfort: Radiant systems provide even cooling without creating unpleasant drafts or cold spots. They are also practically inaudible, as they don’t require fans, blowers or compressors to operate. This helps create more pleasant and peaceful indoor environments.
Greater design flexibility: Radiant cooling setups can be easily tailored and integrated into ceilings, walls or other surfaces, offering significant design freedom. Furthermore, radiant systems require less ductwork and take up less indoor space, without leaving visible vent grilles or bulky indoor units.
Improved air quality: Because there is no forced-air circulation, hydronic cooling systems minimize indoor air movement, reducing the circulation of dust, pollen and other allergens. Compared to conventional split-system air conditioning, air movement can be reduced by up to 80%, improving indoor air quality and providing more comfort for people affected by asthma or allergies.
Compatibility with renewable energy sources: Radiant cooling solutions are often selected for green building developments, as their lower energy requirements make them ideal for pairing with alternative energy sources.

“Radiant cooling is a perfect solution for energy renovations and even for so-called passive or zero-energy houses,” sums up Milenovic. “The most energy-efficient way to run the system is to install an air-source or geothermal heat pump. To operate, heat pumps require only electricity, which can also come from alternative energy sources.”

room with ceiling heating — *Image: Pipelife*

Can We Afford More Air Conditioners?

Air conditioning systems rely on convection to transfer and distribute thermal energy. The indoor unit contains a blower fan and evaporator coils (often referred to as fan coils). Refrigerants are used to remove excess heat from air and transfer it outdoors. As the fan draws warm indoor air across the coils, the liquid refrigerant absorbs heat, cooling the air before it is circulated back into space. Meanwhile, the refrigerant carries the absorbed heat to the outdoor unit, where it is released into the outside air.

The main concern about air conditioners is their significant power consumptionto achieve the required cooling effect. According to the International Energy Agency, air conditioners and electric fans currently account for nearly 20% of the electricity consumed in buildings worldwide. With demand for AC units growing, their energy consumption share is expected to rise even further, putting a considerable burden on the power supply infrastructure and the environment in the next decades.

While protecting people from excessive heat is crucial, the high power consumption and greater contribution to CO2 emissions of forced-air systems have made engineers, architects and homeowners seek more sustainable alternatives.

wall heating and cooling — *Image: Pipelife*

Types of radiant cooling systems

Radiant cooling systems can be integrated into various parts of a building, with each configuration offering its own advantages and applications.

Concrete core activation

Also known as thermally activated building systems (TABS), concrete core activation is one of the most energy-efficient heating and cooling technologies currently available and is increasingly used in modern residential complexes.

TABS must be installed during the initial construction phase, as hydronic pipes are embedded inside concrete slabs surrounding every room. These systems utilize the high thermal storage capacity of concrete and can be used for both heating buildings in winter and cooling them during the summer months.

Radiant ceiling cooling

Ceiling cooling systems are used in both new construction and deep renovation projects. The pipes can be laid directly in the ceiling surface or placed between suspended systems. For comfort reasons, hydronic ceiling systems are typically used exclusively for cooling.

Radiant wall cooling

Radiant wall cooling is often preferred by homeowners who want to combine heating and cooling within one system or improve the energy efficiency of their HVAC setup without undertaking extensive renovations. Wall cooling panels or hydronic pipe systems can be installed across entire or partial wall surfaces to accommodate various interior design needs — and then plastered over for a smooth finish.

Prefabricated radiant cooling systems

Prefabricated cooling systems are modular solutions preassembled and tested in a factory environment before being shipped to a construction site. Their main benefits are exceptionally high reliability as well as faster, simpler setup with minimal risk of installation errors.

The most common solution is radiant panels that can be installed either in walls or ceilings. Pipelife offers preassembled suspended ceiling panels designed to be slotted between ceiling substructures, as well as gypsum ceiling and wall panels that can be quickly attached to the desired surface and plastered over for a sleek aesthetic finish.

For both types of systems, the radiant panels are tailor-made for each project to ensure a perfect fit, fast, straightforward installation, and optimum cooling capacity.

Radiant cooling system design

Designing radiant hydronic cooling setups requires expertise and careful planning to achieve optimal comfort and energy savings while ensuring reliable system operation.

Humidity control

Preventing condensation is a common concern among homeowners considering radiant cooling. To prevent water from condensing on cooling surfaces, the air temperature must remain above the dew point, which depends on the amount of water vapor in the air.

In most indoor environments, the relative humidity is around 40-50%, corresponding to a dew point of 10 °C to 13 °C. Because hydronic cooling systems typically operate at 15 °C to 18 °C, the risk of cooling surface temperatures dropping below the dew point is low. Furthermore, natural venting of excess moisture occurs whenever people open doors and windows; therefore, high indoor humidity levels are rarely achieved, Milenovic explains:

“Moreover, modern radiant cooling setups are equipped with humidity control systems that automatically adjust circulated water temperatures to ensure the dew point range is never reached. When designing radiant cooling solutions for particularly high-humidity environments, the best option is to add a fan coil unit to remove excess moisture from the air.”

Ventilation and indoor air quality

Radiant cooling systems handle sensible heat but don’t provide fresh air circulation. Therefore, to ensure proper ventilation within the building, a separate natural or mechanical ventilation system must be in place.

To maximize energy savings, hydronic systems are best paired with energy recovery ventilation (ERV) systems that ensure heat exchange between exhaust air and fresh air streams without mixing them.

Smart radiant cooling systems

To achieve maximum comfort and energy savings, radiant systems can be equipped with smart climate control — including multi-zone regulation, virtual assistant compatibility, and cloud-based machine learning.

Depending on homeowners’ needs and preferences, options range from relatively straightforward temperature and humidity controls to advanced smart home setups that use geolocation and machine learning to provide optimal user experience. By combining hydronic systems with state-of-the-art thermoregulation, it is possible to select different temperatures for separate zones and maintain them 24/7.

“All our radiant systems monitor air temperature and relative humidity,” says Milenovic. “However, our Premium setups also register users’ daily activities, preferences and patterns and automatically adjust operation for an optimal experience. For example, the system will reduce cooling intensity when you leave your home for work and turn it back on in time for your return. While users have the option to control everything at a very nuanced level, the idea is that over time, they hardly have to interact with the system.”

Combining radiant cooling with heating systems

Because radiant heating and radiant cooling systems both rely on embedded hydronic piping networks and often use reversible heat pumps as an energy source, they can be combined — provided the pipework, controls, and moisture protection are properly designed.

In houses already equipped with radiant floor heating, the best solution would be to add ceiling panels, whereas wall systems can share the same radiant surface to provide year-round indoor comfort, Milenovic explains:

“Humans feel most comfortable when warmer surfaces are near our feet, so the optimal approach is to pair warm floors with ceiling cooling. However, combined wall hydronic systems are also popular due to their lower upfront costs and suitability for smaller-scale renovation projects.”

Comfort, Sustainability and Energy Efficiency: Next-Generation Cooling Systems

Just as hydronic underfloor heating technology has proven effective in addressing the drawbacks of conventional heating solutions, radiant cooling has the potential to replace traditional air conditioning systems as a more ecological, economical, and energy-efficient alternative.

“15-20 years ago, there was reluctance to install underfloor heating systems because it was something new and unknown. Nowadays, such systems have become a standard solution in many European countries,” points out Milenovic. “When we talk about radiant cooling, all the preconditions are in place for this technology to become a standard solution, too.”