Customer stated how the carbon monoxide detectors were going off. The only one that was going off, was not hooked up to anything and was a smoke detector, not a carbon monoxide detector. Ran furnace, didn’t detect any carbon monoxide in ductwork or inside home. No carbon monoxide from fireplace. Co levels in furnace venting were at 20ppm which is normal. All of the detector should get replaced with new carbon monoxide detectors. Found a lot of the detectors are from 2007 and one from 2014. Those are all pasts their lifespan. Signed customer back up on sunshine club. Everything is safe in home.