Yeah this was the root of my question. I get the air thing. May as well not blow dust in/around if you don’t have to, but heat is heat, and R-value is R-value

This this is false

That article has nothing to do with radiators. It’s about the sun warming up the various heat sinks in a house. But also you can generally insulate your way out of this mess as well.

The house itself absorbs heat (and cold). The walls and other surfaces, plus the furniture and everything else. It takes time for those things to adjust.

Right, and they’re absorbing heat from the conditioned inside air. Whether it’s heated by an electric baseboard heater, forced air from a furnace, or a steam radiator, it’s still thermal energy being put into the room for everything to absorb.

I keep thinking radiant flooring is a good solution for this issue but I’ve never lived in a house with it.

My grandma has a midcentury modern house in the Bay Area (CA) with hydronic infloor heat and it’s sooo nice. Honestly if I ever built a house from scratch I’d have it (combined with mini splits for cooling).

Okay so my 1990s build well insulated house with forced air heating would feel warmer than an older brick building with radiators because the walls are less cold.

This was based on my personal experience with both systems over many years

My forced air heat kept my house cozy and warm when it hit -7 in February so it seems to be working just fine.

Thank your insulation