Ok, so we have a wonderful flat with radiant floor heating. Each room has it's own "thermostat" that can adjust the temperature. The question I have is about the actual temperature to set it at. There are no numbers on the little dial, just four lines. I always assumed that a thermostat has the actual temperatures on it. It has been a little chilly up here in the mountains at night and the floors don't seem to be warm and the flat is a bit chilled. How long does it take to work anyway? Thanks. I came from Florida so needing heat is new to me

Presumably you are talking about underfloor heating and assuming the heating is actually switched in July, then try turning it until you hear a click. This will be the thermostat switching on.

If there is no click, then it's simply a thermostatic valve. Turn the valve to open (like a tap) and wait 24 hours. I doubt you will actually be able to feel the floors warm at this time of year, but if they are now 'stone cold' the chill may be taken off them. This will be enough to raise the room temperature to a comfortable level.

An inside thermometer would be useful in this situation...

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Thanks lot. I do hear a click when I turn on the switch and the floors are not stone cold. I guess I need to get an indoor thermostat to check the temperature. How much can they warm? I don't want to wake up in a hot sweat. Thanks again