Here is an adapter that was plugged in overnight showing the heat generated by it.

The laptop after it had been running for several hours.

A small space heater running on medium at about 1500 watts after 20 minutes.

Wall cavity with R-19 Fiberglass Batt showing gaps where air infiltration and heat loss occur

Wall cavity with R-21 Foam showing no gaps where no heat loss or air infiltration would occur

Wall with foam and roof without any insulation

Ceiling showing missing insulation in attic