JFYI, there are largish condo's here (Italy) with central heating that were recently "converted" to new technology.
Basically on each radiator there is an electronic regulating valve (commanded by a thermostat) that logs the usage and that can be interrogated via radio frequency, a managing firm them calculates how much each apartment has to pay for heating.
Set aside the practical folly the system is from a maintenance viewpoint (not working valves, dead batteries, mis-readings and what not), after the first winter the main issues came out.
Till then people paid based on the area of each apartment, suddenly came out huge differences between - say - a central/south/southwest one and an outer/north/northeast one, in some cases the latter costed twice or nearly twice the former.
Yeah, that's what I was wondering about GP - I have some multisensors hooked up to HomeAssistant so I can see what happens over time, and as long as the sun is out the sun can warm mine up like 3-5 degrees between sunrise and noon, even in the winter. It doesn't all dissipate until the middle of the night.
Traditionally (and when/where possible) the way a house is (should be in theory) oriented is/was definite (at least here in central Italy), places where you live during the day (kitchen/dining room/sitting room) should face roughly south, bedrooms should face roughly north.
This way you have most of the light (and warmness) of the sun during the day, while bedrooms are colder (but you have blankets) in winter and fresher in summer.
Basically on each radiator there is an electronic regulating valve (commanded by a thermostat) that logs the usage and that can be interrogated via radio frequency, a managing firm them calculates how much each apartment has to pay for heating.
Set aside the practical folly the system is from a maintenance viewpoint (not working valves, dead batteries, mis-readings and what not), after the first winter the main issues came out.
Till then people paid based on the area of each apartment, suddenly came out huge differences between - say - a central/south/southwest one and an outer/north/northeast one, in some cases the latter costed twice or nearly twice the former.