HOUSTON – An arctic blast is expected to hit the Houston area in just a few days and it might be time to have your HVAC systems checked. Dmitry Ershoe, the owner of H-Town Services, recommends having your system inspected twice a year. Ershoe said if you don’t have your furnace inspected before turning up the heat it could cause a fire or result in Carbon Monoxide poisoning. Lastly, Ershoe said homeowners should change out their air filters once a month. They recommend installing Carbon Monoxide alarms, changing the batteries to your smoke detectors and being extra cautious with space heaters.