The overnight freezing low gave my redneck electric blanket a fair test. Full on with dimmer was warmer than needed, despite room temp barely keeping up. I need to move the dimmer where I can reach it while under covers in bed so I can fine tune for comfort.
[update- I rigged up a GFCI outlet for the hillbilly electric blanket... I had to add an extension cord to get the dimmer control over by my bedside table. I predict I will be able to realize a fixed set it and forget it dimmer setting, as this should track with room temperature very well. /update]
[update2- another proper test with overnight low of 28'. The low output (only 250W) baseboard heater was barely keeping room temp up to thermostat setting, but my red neck electric blanket needed to be turned down because bed was too warm. Right now the dimmer is set around 1/3 and bed was borderline too warm. A couple watts of electric blanket heat will be even cheaper than hundreds of watts of baseboard heat.
I wonder if I could impute the temperature of the blanket heat element from its resistance (current draw). In theory that should work, but I don't expect it to make easily measurable changes over just a several degree range. Nah not worth the effort. /update]
[update3 some electric blankets use carbon fiber for heat elements, I can feel the wires in mine. /update]
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