Radiant heat from the sun heats objects, like you, before it heats the air around you. You can be warm while the air remains cool and fresh.
Undertile is the best type of flooring to use for heating, as tile and stone have high thermal conductivity, meaning that the heat from an underfloor heating wire transfers to the floor surface quickly, warming the floor surface where you require it. Combining correct control with the correct installation gives you a cost-effective heating system, with no more cold spots or chilly drafts. Maximum effectiveness can be achieved when used with insulation boards, they not only act as an excellent waterproofing agent, but reduce footfall noise and echoes in your larger tiled areas.