[fsckboy]

>HVAC equipment does this with standardized thermostat terminals.

yes, they standardize thermostat terminals, but they should allow additional inputs such as a measure of radiant heat entering through the boundary surfaces. I have to change my thermostat far more because it's a sunny day than I need to because of different outdoor temperatures. Bear in mind, I shouldn't have to change my thermostat at all† (except perhaps between summer and winter)

† perhaps my biggest pet peeve, and I have many, is that 99% of the population—including engineers from top universities—believe that if you feel warm you should imediately max-out your A/C thermostat, and when you get cold you should shut it off. It's a thermostat, its job is to turn on-and-off to maintain a temperature. I never touch the one in my car and it works great. (as mentioned, I need to change the house thermostat, see solar radiance‡ above)

‡ I once had the pleasure to work with a great mechanical engineer, he designed climate systems for art museums and other public and billionaire buildings, and I described my radiant heat problem and he said "that would be super advanced, I've never heard of any systems that do that."⹋

⹋ another one of my pet peeves is footnotes. In general, they require a massive context shift, as if it's not a problem to keep your place while you look in another place. But notice how I've threaded mine so they do not require congnitive leaps.

[necovek]

Does the radiant heat not increase the room temperature, thus affecting the indoor temp sensor? Combining that input with outdoor temperature (and whole weather stations) is totally done.

Similarly, floor heating systems measure temperature of the radiating element (floor) and room temperature to decide if they switch heating on or off.

I generally combine shutters for large windows in controlling the temperature in my automation too (greenhouse effect).

[NoLinkToMe]

> Does the radiant heat not increase the room temperature, thus affecting the indoor temp sensor? C

Yes but the temperature of the air in your home is only one part of it. The other part is the temperature of the radiant heat.

I always understood that the temperature is measured in the shade, and that the difference between shade/sun on a sunny day can be very significant. A temperature of 22 degrees in the sun would feel like standing in the shade at 30 degrees.

Similarly in your home it could very well be that the air is your house is heated up to 22 degrees by the outside air and radiant heat, but additionally if you're under the radiant sun sitting next to a window it can feel much hotter.

Of course if the temperature meter itself is exposed to the radiant heat, it'll likely measure that directly. But mine for example is mounted under a table in a utility corner and gets virtually no radiant heat. I could mount it next to the window to get exposure to the radiant heat of the sun, but then if I'm sitting further away from the windows in the room I get no radiant heat but the sensor does, and it'll think the room is a lot hotter than the experience I'm having.

[fsckboy]

>Does the radiant heat not increase the room temperature, thus affecting the indoor temp sensor?

if that was true, I would not feel the need to adjust the thermostat, i'm basing this on the pattern I've noticed wrt feeling discomfort, and I remember temperature numbers. In general, I find A/C chilly below 75ish and warm (in a humid way) above 77ish so it stands out to me when i feel the need to push the system harder just to maintain comfort

[ssl-3]

That sounds neat.

But it's just a furnace (or just an aircon) that is controlled by a thermostat. In broad strokes, the combined system just turns things on and off (or speeds them up, or slows them down).

So what would it do with that information if it had it?

I mean: Suppose that the thermostat knows, however it knows this, that you're experiencing an uncomfortable level of warmth due to radiant heat in a particular room.

What does it do next? Make everything else in the house (or the zone) cooler to compensate? Something else, instead?