Well, haha.... I've got an alternative solution, I just put a "Thirsty Hippo" into my dry box. Dun underestimate that small package, it can maintain a RH of 60% for quite a period of time. It's a pretty good temporary solution. But for long storage, I still depend on my dry cabinet.
Actually, a dry cabinet don't really consume that much electricity. And you certainly dun have to leave it on all the time. The average daytime RH or Singapore is about 60% to 70%, which is quite alright for camera equipment, it's only at night when the air becames wetter then you need to turn on your dry cabinet.
Leaving a dry cabinet for too long may also dry up the lubricant gel in your camera equipment, making the mechanical parts undergo stress and subjective to failure. So guys, watch it with the dry cabinet.