Back in the late 60’s we built many houses in a development we managed. Most of the houses were for retirees and were low maintenance. They featured all-electric because we had a nearby nucleur power plant and had very low rates. Single story on a slab with electric baseboard heat and aluminum siding.
Our house was meant to be an upscale model and was 2 story. We used radiant ceiling heat (electric wire embedded in the plaster). The bathrooms had tile floors and radiant heat underneath. I have seen on ‘This Old House’ where they would use tubes with heated water, but ours was electric wire. I did a lot of the wiring in the house myself, just not the radiant wires.
Outside we used what I remember was Rubberoid siding. It was a rubber-based product with color throughout. There may have been asbestos embedded but am not sure. Certainly asbestos was common in roofing at the time.
I had an opportunity to visit that house some 30 years later and the sideing loooked new. It still appears great now 50 years later based upon Google Earth street view.