OSHA has no single IAQ standard, but complaints still matter.
OSHA says IAQ can include temperature, humidity, lack of outside air, mold, and chemical exposure, and employers still have General Duty Clause obligations for recognized hazards.
Commercial Indoor Air Quality | ASHRAE 62.1 Ventilation Review
Document Poor Ventilation Before It Becomes a Complaint.
On-site IAQ assessment with a written findings report for Chicagoland commercial buildings that need more than a generic service call.
Named written deliverableNot just "contact us" and a vague walkthrough.
Mechanical fix pathThe same HVAC lane can correct approved findings.
Medical-aware reviewMedical, clinic, and high-sensitivity spaces get separate attention.
Tenant-ready languageFindings are framed so ownership can act on them.
The complaint is not the starting point. The paper trail is.
Indoor air quality becomes urgent when there is a tenant complaint, employee complaint, renewal question, medical requirement, or ownership request for proof. A written HVAC-centered IAQ report gives facility teams a defensible place to start.
Tenants are asking better ventilation questions.
A facility team that can show ventilation, filtration, and HVAC findings has a stronger renewal conversation than one relying on "we think it is fine."
We help you make the case to ownership.
The report separates low-cost operational corrections from maintenance work and capital items, so ownership can approve the right work instead of debating an invisible problem.
Recognize any of these building signals?
Most IAQ calls start with symptoms that feel vague. The useful move is to map the complaint to likely HVAC causes and document what was checked.
Staff complaints about stale or stuffy airOften points to outdoor air, economizer, demand-control ventilation, or scheduling issues.
Dry air, static, or winter irritationCan point to humidity control, outside-air strategy, or seasonal heating operation.
Headaches or fatigue clustering by floorCan point to CO2 buildup, VOC sources, poor dilution, or air distribution problems.
Musty odors after weekends or seasonal transitionsCan point to drain pans, moisture, duct conditions, filters, or envelope-related humidity.
Medical, clinic, or high-sensitivity tenantsSome spaces need a tighter look at ventilation rates, filtration, pressure relationships, and code path.
A written tenant or employee complaint landedThe next step is not guessing. It is documenting what was reviewed and what will be corrected.
Named Deliverable
Written IAQ Assessment Report
A useful IAQ visit should leave your team with something more practical than a verbal opinion.
Your report can include:
- CO2 and ventilation observations where applicable to the space.
- Filtration review, including whether higher-MERV filters are realistic for the equipment.
- Outdoor air, economizer, damper, schedule, sensor, coil, drain pan, and airflow observations.
- Photo-supported findings and a prioritized fix list for facility and ownership review.
- Notes on when a CIH, engineer, hygienist, or design professional should be brought in.
Most IAQ providers stop at the report. Most HVAC pages never get that far.
Northern Weathermakers sits in the useful middle: we can document the HVAC-side IAQ issue and then perform the approved mechanical work.
Assessment-only firm
Can test and write a report, but usually hands the owner a separate project to find and manage.
Generic HVAC service
Can repair equipment, but often does not frame IAQ around documentation, tenant risk, or standards.
NW IAQ assessment
HVAC-focused assessment, written findings, practical prioritization, and an in-house path to correct approved fixes.
Built for offices, medical-adjacent spaces, and high-sensitivity tenants.
Commercial IAQ is not one-size-fits-all. A property manager, medical office, dental clinic, school, lab-adjacent tenant, or dense office floor may need different documentation and different next steps.
Office and property management
Document stuffiness, floor-by-floor complaints, renewal questions, return-to-office comfort concerns, and ventilation questions from tenant brokers.
Medical and high-sensitivity spaces
Review HVAC-side conditions against the right code conversation, including when ASHRAE 62.1, ASHRAE/ASHE 170, or design-team input belongs in the path.
Industrial and mixed-use buildings
Separate general comfort complaints from process, exhaust, makeup air, filtration, humidity, and outside-contaminant concerns.
The public standards give your IAQ conversation weight.
NW avoids unsupported before-and-after claims. The stronger route is to measure what can be measured, cite the right public standards, and show the fix path.
90%EPA says Americans spend approximately this much time indoors, with some indoor pollutants often 2 to 5 times outdoor concentrations.
52%OSHA's technical manual cites NIOSH investigations where inadequate ventilation was the primary source of IAQ problems.
1,000 ppmChicago mechanical code uses this CO2 ceiling for certain demand-ventilation reductions.
5+ ACHCDC/NIOSH says to aim for 5 or more air changes per hour of clean air when possible.
Sources include EPA, OSHA/NIOSH, CDC/NIOSH, Chicago Mechanical Code, and ASHRAE public standards summaries. Final compliance decisions should be confirmed against the project, code path, and authority having jurisdiction.
Questions before you ask for an IAQ report.
The goal is not to oversell IAQ. It is to document the HVAC-side conditions, identify practical fixes, and know when another specialist belongs in the conversation.
Can NW fix what the assessment finds?
Often, yes. If the issue is tied to filters, coils, drains, economizers, outdoor air dampers, schedules, sensors, controls, humidity, or mechanical operation, Northern Weathermakers can usually price and perform the approved HVAC work.
Do you replace a Certified Industrial Hygienist?
No. A CIH or specialized testing firm may be the right path for legal, exposure, mold, chemical, or litigation-sensitive scopes. NW's assessment focuses on the HVAC and ventilation side, and the report can identify when another professional should be brought in.
What standards do you consider?
The review can consider OSHA IAQ guidance, ASHRAE 62.1 ventilation concepts, Chicago mechanical-code ventilation requirements, CDC/NIOSH clean-air guidance, filtration capability, and ASHRAE/ASHE 170 considerations for medical spaces when relevant.
What if a written complaint already landed?
Start documenting. The useful first step is to record what was reported, what spaces are involved, what equipment serves those spaces, what was measured or observed, and what corrective path is recommended.
How quickly do we get the report?
The target is within 7 business days after the site visit for a normal commercial IAQ assessment. Larger buildings, multi-tenant scopes, medical spaces, or scopes requiring outside specialists may need a longer report path.
Give ownership a written IAQ answer.
Document the concern, identify the likely HVAC causes, and put a practical fix path in front of the right people.