For anything greater than 20-feet, you need a heavy gauge contractors type ext cord, look for a cable with 10 or 12 gauge wire (I use a no 10 gauge Yellow Jacket cables) in a weather proof cover and sealed ends, that is 20-amp rated. This is good for up to a 50-foot run, a longer run will required a 8-gauge wire. cheers
2018 TaB400 Custom Boondock, Jeep Gladiator truck, Northern California Coast.
I use a 100 ft. 12-3 and have no voltage drop issues even when I run the AC. I am using the Progressive Industries hardwired EMS Surge Protector and can monitor the voltage under load etc. and it never complains (IE shuts down). If I were going to run the Alde on electric, the AC, and think about the microwave, yes a heavier cord would be a must but for powering the camper in my back yard the 12-3 is fine.
Brad
2020 400 BDL aka "Boonie" 2022 Black Series HQ19 aka "Cricket" 2021 F-250 Tremor with PSD aka "Big Blue" Concord, NC
In my yard, I regularly extend my regular RV cord with a 75' 12 gauge extension cord to reach a 20 amp outlet. I'm able to run both the Alde electric heaters with this set-up. If you add the A/C and other devices to this mix you are probably going to exceed the amperage rating of your outlet anyway (which will in turn trip the breaker in your house).
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cheers
Brad
2022 Black Series HQ19 aka "Cricket"
2021 F-250 Tremor with PSD aka "Big Blue"
Concord, NC