[/quote]Leaving your engine idling to warm it up increases engine wear.
Really? How, exactly?
idling engines (eventually) leads to polished and glazed bores and to piston ring/piston skirt wear.
My 1991 ex-military winterised Landrover has a heated windscreen-wouldn’t be without it-brilliant in this weather, and an ignition barrel that you can remove the keys from whilst the engine is running- fitted because it was a radio truck and needed the engine running for the 24v power system for the radios/operator in the back.