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An anxiety disorder is a common mental illness defined by feelings of uneasiness, worry and fear. While anxiety occurs for everyone sometimes, a person with an anxiety disorder feels an inappropriate amount of anxiety more often than is reasonable. For example, an average individual may feel some anxiety before going to a dentist appointment but a person with anxiety disorder may feel anxiety every time they leave their home. One of the most common problems with hvac equipment is poor ventilation. This problem makes your hvac equipment work like inefficient outdated models which can waste plenty of your money. The two most common reasons behind poor venting: inadequate duct sizing as well as a dirty return air filter.