Can electric radiant floor heating handle extreme cold?
While many homeowners use a floor heating system for supplemental comfort, real-world data proves it can serve as the primary heating source in cold climates like Canada, provided the system is correctly sized and the home is well-insulated.
To test the limits of radiant heating, a suburban Chicago-area home was monitored during a particularly frigid January week when outdoor temperatures dropped well below zero to -22.5 C. Despite the ‘icy clutches’ of a Midwestern winter, the electric floor heating system maintained a consistent, comfortable 21 C indoor temperature.
| Date | Average Outside Temperature | Indoor Temperature Maintained | System Status |
|---|---|---|---|
| January 6 | -22.5°C | 20°C – 21°C | Primary Source |
| January 7 | -20°C | 20°C – 21°C | Primary Source |
| January 8 | -15.5°C | 21°C | Primary Source |
| January 9 | -12.5°C | 21°C | Primary Source |
Most electric floor heating systems are designed to reach a floor surface temperature of 26 C to 30 C. This is the ‘sweet spot’ for human comfort, as it is warm enough to heat the room through radiation but not too hot to walk on. In extreme cold, the system works harder to maintain this surface temperature against the heat loss of the room. For those living in small houses or homes with pets, this consistent, low-level heat is often more efficient than the ‘blast and fade’ cycle of forced-air furnaces and heat doesn’t escape to the ceiling.
Electric floor heating typically costs between $8 and $12 per square foot for the heating elements and controls, making it a cost-effective solution for many renovations.
Radiant heat is also 100 per cent efficient at the point of use, as there is no heat loss through ductwork or air filtration.
Before installing radiant heat as a primary source, it is critical to perform a heat loss calculation with the homeowner. The effectiveness of the system can vary based on climate, insulation and position of the room that requires heating. The heat loss calculation ensures the system can produce more BTUs than the room loses to the outside environment.
Further, it is important that homeowners keep in mind that radiant systems have a thermal lag of 12 to 24 hours; for maximum efficiency in cold climates, it is best that they maintain a steady temperature rather than using deep setbacks or it will struggle to catch up.
Julia Billen is the founder, president and driving force behind WarmlyYours radiant heating, where she has led innovation for more than 26 years. Since introducing electric towel warmers to North America in 1995, Julia has transitioned radiant solutions from luxury upgrades into home essentials. As an industry expert, she serves on multiple standards committees, including UL and IEC, to shape global product safety and performance.