Smile HVAC will help you with repair, service and installation of any HVAC equipment including furnace, air conditioner, water heater, humidifier, water treatment systems and more. We have the best HVAC professionals at your service. FREE SERVICE CALL with a repair - for members and non-members! A humidifier evaporates water and increases the humidity of the air you breathe. It will be useful if you have lung problems, sinus congestion or chronic runny nose. Smile HVAC provides all kinds of humidifier services.