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Which Is Better, Forced-Air or Radiant Heat?
If you are in the market for a new heating system, be sure to consider the benefits of radiant heat over forced-air. Not only is radiant heat 30 percent more efficient, it also provides a more even, continuous level of warmth.
In the radiant floor vs. forced-air heating debate, radiant floor always wins because it provides a quiet, even heat and eliminates the allergy problems often associated with heating ducts. But there’s another reason why radiant floor heating is superior to its blowy cousin—it’s simply more efficient.
The Problem with Forced Air
Anyone who’s ever lived with a forced hot air system is familiar with the challenges of this type of heat, which is akin to warming your home with a series of hot-air hand dryers mounted in the ceiling or floor. The room warms quickly, but then cools equally fast, forming a yo-yo heating pattern that can prompt you to constantly adjust your thermostat, causing your furnace to turn on and off, wasting energy.
Forced hot air systems are also subject to something known as parasitic heat loss. Because the air from the furnace and air handler has to travel through a series of tubes to get to its intended room, there are many opportunities for it to leak wherever there are small openings in the ducts. Also, the ducts for this type of system often travel through cold attics or basements, increasing the chance that heat will be lost as the warm air travels to the rooms in your home.
The warm air released by forced-air systems either pumps out through grates in the ceiling, where it tends to stay, or it shoots out of vents in the floor and flies quickly up to the ceiling. The result is stratification—a situation where the top of your room is warm (sometimes as much as 10 degrees warmer) and the center and bottom part of your room is cooler. This means you’ll turn your thermostat up higher to get the heat to reach the portion of the room in which you actually live. All this air movement also has the paradoxical effect of cooling you. Think about being outside in the sun on a cool day. You might feel comfortable in a short-sleeved shirt until a breeze blows. Forced hot air systems create breezes in your home all the time.
Finally, it is difficult to create zones with a forced hot air system. As a result, you have to heat your entire home to one temperature, or, if you have a dual-floor system, you have to heat an entire level. Because you might need heat only in the few rooms you occupy the most, you are effectively throwing money away by warming empty spaces.
The Benefits of Radiant Heat
A radiant floor system solves all of the inefficiencies inherent in forced-air systems, with some studies showing that they are as much as 30 percent more efficient.
Because the heating panels are in direct contact with the floor, there is very little parasitic heat loss, as there are no long pathways for the warmth to travel. Air doesn’t shoot out of vents in this kind of system, so there are no breezes to contend with, which allows you to keep the thermostat lower. The blower in a forced-air system typically requires nine times the electricity used by the pumps in radiant systems. Plus, the heat is also more consistent with radiant flooring. Rather than getting blasts of warm air that dramatically raise the room’s temperature, radiant heat provides a continuous level of warmth, which means less fussing with the thermostat.
Another major benefit of radiant over forced-air heating is the fact that 50 percent of the heat it produces comes from infrared, a form of invisible light. This type of heat works best as you get closer to it (think about a light bulb); therefore, because radiant heat is embedded in the floor, it will keep you warmer than heat that congregates up near the ceiling. This saves energy not only because you can lower your thermostat, but also because radiant systems need to produce heat in just the 75 to 80 degree Fahrenheit range, as opposed to the 120 to 140 degree Fahrenheit temperatures generated by forced-air systems.
Even More Efficiency
So, there’s little doubt: Radiant systems will save you money and energy usage over forced hot air systems. But is there an even more efficient form of radiant floor heating? Yes.
The company Warmboard makes thin radiant flooring panels that are superconductive. This means that the heat from the hot water channels each panel contains is easily and quickly transferred to the surface of the floor. This means that a significantly lower water temperature can produce the same room temperatures as less responsive systems. In fact, it’s estimated that the water used in Warmboard panels can be as much as 30 degrees Fahrenheit lower than in other products, which results in an energy savings of 10 to 20 percent—and that’s above and beyond the savings you’d see just switching to any radiant floor system.
Further savings can be realized from Warmboard’s nimble panels because they heat and cool quickly. This is not the case for other radiant systems that might rely on thick concrete to heat up before releasing their heat to the room. Such systems can then require quite a long time to cool after the thermostat is turned down. Warmboard panels, in contrast, are extremely responsive to adjustments in the thermostat, which means less energy is used in getting the room warm, and greater comfort is achieved when you need to cool the room down if you’re feeling too hot.
This post has been brought to you by Warmboard. Its facts and opinions are those of BobVila.com.