Central Heat and Air Conditioning (Heat Pumps).

Cold? Carry in wood to burn from the 3 to 6 chords of wood you had to split in the summer/early fall. Hot in the summer, sweat it out on the porch, or find water to cool off in. Mans greatest invention and biggest comfort giver, gone.

Most people in the desert would die before they could walk to a more temperate climate. Even without a nuke, there would be hundreds of thousands of corpses in Vegas.

Yes, I would miss that most. As the amount of work required simply to regulate our local environment would go from sliding the lever on the thermostat to near full time job. The elderly and weak would perish simply from the temperature extremes placed upon their bodies.

Sad outcome to contemplate.