Help. There is a gas like smell in my daughters upstairs bedroom. I had the gas company out to test for a leak and they turned off all the gas appliances and saw no evidence of a gas leak.I had the HVAC people out and the system is working and shows not evidence os a leak.The smell comes and goes.If the door to her room is closed it gets very strong. All the gas appliances are in the basement and there is no smell anywhere but in her bedroom which is on the third floor outer corner of the house.It is over the laundry room but all the appliances are electric in there.I am worried this could be bad for her health please help.Who would I even call now to determine the problem?