If the readout is substantially below 12 volts, and definitely if its at zero, the socket requires repair and/or replacement
We also followed Frontdoor HVAC expert Ryan McNabbs advice: The best filter to remove smoke is, in fact, a combination of filters: a HEPA filter, which removes smoke particles, paired with an activated carbon filter, which removes odor particles. In addition to removing smoke and eliminating odors, they also combat dust mites and other particulates that impact air quality and may cause difficulty breathing
But a well-designed purifier can capture virtually all airborne allergens, bacteria, viruses, and smoke, and do it quietly and efficiently, around the clock, for years on end
*Data accurate at time of publication
My daily smoke for the past 20 years