What the Denver School Study Gives Members That They Did Not Have Before

In our previous Industry News article, New Study Examines HVAC System Cleaning and Classroom Indoor Air Quality, we summarized the Denver school study’s methodology and key findings. Now, we are taking the conversation one step further by looking at how NADCA members can use this information. 

The Denver school study gives NADCA members something they have not previously had: field-based evidence from occupied buildings connecting ACR-based HVAC system cleaning with measurable reductions in airborne particulate matter.

Much of the conversation around HVAC system cleaning relies on inspections, before-and-after images, and evidence of contaminants removed from the system. The Denver study adds research showing what happened in the air of occupied classrooms after the HVAC systems were cleaned.

Why the Occupied-Classroom Setting Matters

The study was conducted in working public schools, not in an empty building or controlled laboratory. Students and educators continued using the classrooms while researchers monitored airborne particulate matter across multiple seasons.

This makes the findings relevant to customers responsible for occupied buildings. Schools, offices, healthcare facilities, and other commercial properties all need practical evidence of what can happen under real operating conditions.

The Denver study provides that evidence. Measurable reductions in airborne particles followed cleaning in occupied spaces where normal activities continued.

Members can introduce the research this way:

Research conducted in occupied Denver school classrooms found measurable reductions in airborne particulate matter after the HVAC systems were cleaned according to ACR, The NADCA Standard.

The ACR Scope Is Part of the Finding

The results are directly connected to the work that produced them.

The Denver project included air-handling units, coils, supply and return ductwork, registers, vents, grilles, and diffusers. The cleaning followed ACR and included measures to control particles during the work.

This distinction is useful when customers are comparing proposals. Members can say:

The Denver findings followed a comprehensive HVAC system cleaning performed according to ACR. When comparing proposals, both the scope of cleaning and the methods used matter.

This gives customers a clear reason to look beyond price and compare which system components are included, how contaminants will be removed, and how the occupied space will be protected.

Putting the Findings to Work

The study can strengthen proposals, presentations, websites, and other marketing materials. The language should remain closely tied to what the research measured.

In proposals:

A Denver-area demonstration study conducted in occupied public school classrooms found measurable reductions in airborne particulate matter following comprehensive HVAC system cleaning performed according to ACR, The NADCA Standard.

In presentations:

The Denver study provides field-based evidence that ACR-based HVAC system cleaning can support efforts to reduce airborne particulate matter in occupied buildings.

On websites and marketing materials:

Research in occupied Denver school classrooms found lower levels of airborne particulate matter after the HVAC systems were cleaned according to ACR, The NADCA Standard.

Keep Claims Connected to the Research

The study measured airborne particulate matter. That gives members several clear, supportable messages:

• Airborne particulate matter was reduced after cleaning.
• The findings came from occupied classrooms under real operating conditions.
• The cleaning included the full HVAC system and followed ACR.
• HVAC system cleanliness can support efforts to reduce airborne particles as part of a broader indoor air quality plan.

The study did not evaluate health, attendance, academic performance, or productivity. Claims about those outcomes would go beyond the research.

It is also important to connect the findings to the scope of work. The reported results followed comprehensive HVAC system cleaning performed in accordance with ACR, The NADCA Standard and should not be used to support limited cleaning that does not reflect the work performed in the study.

A Strong New Proof Point

The Denver study connects comprehensive HVAC system cleaning with measurable changes in airborne particulate matter in real classrooms while they were being used.

For NADCA members, that is a meaningful new proof point. It supports stronger conversations about indoor air quality, reinforces the importance of a complete scope of work, and gives customers research-based evidence of the value of cleaning according to ACR.