Selling indoor air quality upgrades responsibly

Why IAQ sales need extra care

Indoor air quality products are easy to oversell. Homeowners cannot see most pollutants, health worries are personal, and marketing claims in the category range from careful to wild. That puts the burden on the HVAC company to keep its recommendations grounded.

People also spend a lot of time indoors, at home. In 2025, 35% of employed Americans did some or all of their work at home on days they worked^[2]. For them, the air in the home is the air in the office too, which makes IAQ a reasonable topic to raise when there is a real issue.

Step one: find out what the homeowner is experiencing

Ask open questions and write the answers down. The goal is to identify the problem, not to qualify a sale.

• What made you ask about air quality? Dust, odors, stuffiness, dryness, condensation on windows, allergies, asthma, smoke?
• Which rooms and what times of year?
• Are there pets, smokers, a gas range, an attached garage, recent renovation work or a damp basement?
• Has anyone in the home been advised by a doctor to reduce dust or allergens?
• What have you already tried, such as portable air cleaners or dehumidifiers?

If someone mentions headaches, nausea or dizziness that improve away from home, treat it as a possible carbon monoxide issue first. More than 400 Americans die each year from unintentional non-fire carbon monoxide poisoning, and more than 14,000 are hospitalized; gas and oil furnaces are among the sources^[3]. Check combustion appliances and CO alarms before discussing anything else.

Step two: test and inspect before recommending

A short inspection and a few readings turn a guess into a recommendation the homeowner can see.

1. 01

   Combustion safety

   On homes with gas or oil appliances, check venting, test for CO near appliances and confirm working CO alarms. This is safety, not a sales step.

2. 02

   Humidity

   Measure relative humidity in several rooms, and note condensation, musty smells or very dry air in winter.

3. 03

   Filtration and airflow

   Check the current filter's rating and condition, the filter rack fit, static pressure and return air sizing. A filter that bypasses or chokes the system is a common, fixable issue.

4. 04

   Ducts

   Look for leaks, disconnected runs and returns pulling air from attics, garages or crawl spaces.

5. 05

   Sources

   Note obvious sources such as an unvented gas range, a damp basement, an attached garage or stored chemicals.

6. 06

   Record and photograph

   Write the readings on the report and photograph what you found, so the homeowner can see it.

Step three: recommend in the order EPA suggests

EPA's guidance on air cleaners puts source control and ventilation first, with filtration as a supplement^[1]. Following that order keeps recommendations honest and often solves the problem more cheaply.

1. Source control: fix what causes the problem. Seal returns pulling air from the garage, vent the range hood outside, repair the leaking duct in the crawl space or address damp areas.
2. Ventilation: bring in fresh air in a controlled way. Options range from properly used exhaust fans to balanced ventilation systems, depending on the home and climate.
3. Humidity control: whole-home dehumidification in humid climates or basements; humidification in very dry winters, with attention to avoiding condensation and mold.
4. Filtration: upgrade the central filter where the system can handle it. EPA recommends selecting a filter rated at least MERV 13 or as high as your system will accommodate^[1]. Check static pressure before and after.
5. Portable air cleaners: for specific rooms, such as a bedroom. EPA explains that a higher clean air delivery rate (CADR) means more particles filtered and a larger area served^[1].

Products to avoid or explain carefully

EPA advises avoiding portable air cleaners and furnace or HVAC filters that intentionally produce ozone, and notes that no federal government agency has approved ozone generators sold as air cleaners for use in occupied spaces^[1]. Keep those off your menu.

Some other technologies, such as certain ionizers, UV lights and "air purification" devices, vary widely in what independent testing shows. If you sell them, use the manufacturer's tested claims, state the test conditions and check that the product does not produce ozone. If you cannot explain how a product works and what it has been shown to do, do not sell it.

Honest claims versus risky claims

Energy and airflow trade-offs

Heating and cooling already use a large share of home energy: space heating and air conditioning accounted for 52% of US household energy consumption in 2020^[4]. IAQ upgrades interact with that. Higher-efficiency filters can add resistance to airflow; ventilation brings in outside air that must be heated or cooled; dehumidifiers use electricity. Be upfront about the trade-offs, and check that the HVAC system can handle the change.

Installation quality matters too. ENERGY STAR says improper installation can reduce HVAC system efficiency by up to 30%^[5]. An IAQ upgrade added to a system with poor ducts or airflow may not perform as promised, so fix the basics first. Our guide to add-ons techs can offer covers simple filter and duct upgrades.

Presenting options

Give the homeowner a written summary of what you found, then two or three options tied to those findings.

• Essential: source fixes and a properly fitted filter upgrade.
• Recommended: the essentials plus humidity control or duct repairs that address the specific complaint.
• Comprehensive: the above plus ventilation or room-level filtration where it clearly helps.

State what each option is expected to change, in measurable terms where possible, and offer to re-measure after installation.

Following up after installation

The follow-up visit or call is where IAQ work earns trust, and it is often skipped. Book it before you leave the installation.

1. Re-measure what you measured before: humidity in the same rooms, static pressure at the same points and CO near combustion appliances.
2. Ask the homeowner the same questions as the first visit: dust, odors, stuffiness, comfort in specific rooms.
3. Show the before and after readings side by side on the report.
4. If something has not improved, say so and investigate. A partial result explained honestly is better than a claim that everything is fixed.
5. Set the filter replacement schedule and, where you run a maintenance plan, add the IAQ equipment to the visit checklist.

Training the team on IAQ conversations

Technicians are often the first to hear about air quality concerns, usually as a passing comment. Give them a simple routine: acknowledge the concern, take one or two readings if they have the tools, and offer a dedicated IAQ assessment rather than recommending products on the spot. Make sure everyone knows which claims are off-limits and why, and keep the approved product list short. Review a sample of IAQ proposals each month to check that every recommendation links back to a reading or a finding in the home.

Example: dust complaints in a two-story home

Example (fictional): A homeowner calls about dust and a stuffy upstairs. The technician finds a 1-inch fiberglass filter that does not fit the rack, a disconnected return duct pulling air from the attic and relative humidity around 65% upstairs in summer. Instead of recommending a purifier, the technician proposes reconnecting and sealing the return, a properly fitted MERV 13 media filter cabinet after confirming static pressure, and a follow-up humidity check. The homeowner chooses those fixes. A month later, the readings show lower upstairs humidity and the homeowner reports less dust. The company later offers a whole-home dehumidifier, but only because the humidity readings justify it.