Underloor heating

I am installing in a new build, electric underloor heating (DEVI). The room is fairly large (35 mete square) with a large glass area in the back south facing wall. My question is, with the time it takes to heat the floor/room, then the sun comes out (obviously talking about winter time here or the heating would be off anyway), and as there is a large area of glass, the room may heat up quite quickly due to the sun, as the heating would therefore switch off, and then sun goes in, heating on etc etc. Is this a problem others have encountered, i.e. the room going from just right to very hot then cooling down. With a normal wet radiator type system the same would happen but the reaction time with radiators is much quicker, so wouldn't be as much of a problem?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.