It will depend on your heater that you picked. My heater in my house is not a variable fired furnace and it only heats my floor up at one temperature. The place in Maine checks the temp outside and fires based on that. If it is cool it will only run the pipes at a lower temperature, if very cold it will run them at a much hotter temp. This stops the roller coaster ride that my primary house has at this time of the year. Yes you can just open the windows and you will not really loose much stored energy because when you close the windows the floor is still warm. Radient is by far the most comfortable and efficient way to heat a home when it is installed correctly. Most issues seen in homes are dues to the tubes being spaced to far, the temp being to high in the tubes, or poor insulation in the house.
Depending on what kind of flooring you have you will want the radient to be set to as low of a temperature as it can be. To hot on a wood floor will dry it out.
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