Radiant floor heat is very affordable. However, there is no standard cost of using it. The monthly cost depends on the size of the area being heated and how much your electricity provider charges per kilowatt hour (KWH).
To figure out the cost of heating a room in your house, you can multiply the square footage of the area you would like to heat by 12 watts (the power output of standard mats and cables). This will give you the number of watts per hour the system will use. Convert that number to kilowatts (KW) and multiply by how much the electric company charges per kilowatt hour (KWH) to find your cost.
If you would just like quick rough estimate, you can also use the Project Calculator located on the bottom of our home page, though the estimate provided by this calculator may be off if rates have recently changed in your area.