Deciding whether to get an indoor air quality (IAQ) test for your building can be influenced by several factors. Here are some reasons you might consider an IAQ test:

1. Health Concerns: If occupants are experiencing unexplained health issues, such as headaches, dizziness, respiratory problems, allergies, or other symptoms that improve when they are outside of the building, this could be a sign of poor indoor air quality.

2. Odors: Unpleasant or unexplained odors can be indicative of mold, bacterial growth, or other contaminants.

3. Visible Mold or Moisture: If you see mold growth or if there are areas in the building where moisture accumulates, it's essential to determine the extent of the problem.

4. Recent Construction or Renovation: Construction can introduce pollutants and also disrupt the building's ventilation. New materials can also off-gas volatile organic compounds (VOCs).

5. Occupant Comfort: If people in the building report being too hot, too cold, or feeling drafts, it may not be just an HVAC issue. Discomfort can also be a sign of poor indoor air quality.

6. Old HVAC Systems: Outdated or poorly maintained heating, ventilation, and air conditioning systems can negatively impact air quality. They might not filter air effectively, or they might even introduce contaminants.

7. History of the Building: If the building had previous water damage, pest infestations, or was used for industrial purposes, there might be lingering IAQ issues.

8. External Factors: If the building is located near a source of pollution, like a factory or highway, or if there's been recent nearby construction, the indoor air quality might be compromised.

9. Compliance and Liability: Depending on where you are and the nature of your building (e.g., if it's a workplace or a rental property), you might have legal or regulatory reasons to ensure the air quality meets specific standards.

10. Peace of Mind: Sometimes, it's just about wanting to ensure the health and safety of those inside.

However, keep these points in mind:

Not all IAQ tests are created equal. Depending on what you're concerned about (e.g., mold, VOCs, carbon monoxide, radon), different tests might be needed. 

 Make sure you use a reputable company or professional to conduct the test. They should be able to interpret the results for you and suggest remediation steps if necessary. Some IAQ problems can be resolved with simple solutions like improving ventilation, while others might require more significant interventions. If you're uncertain, you could consult with an environmental health professional or an indoor air quality specialist. They can provide guidance based on your specific situation.