Indoor air quality marketing is the HVAC category where the products are real and the copy often runs ahead of EPA's guidance.
Handled honestly, it becomes an asset inside HVAC lead generation: a measured second offer on the visits you already book.
The demand behind the category
Google Keyword Planner data for the US (pulled October 2026) reports about 14,800 searches a month for "whole house air purifier" and about 3,600 for "indoor air quality testing".
Both are national 12-month averages, not your city's volume; the point is homeowners already ask, so the offer belongs inside your estimate process.
What EPA's guidance says you can claim
EPA's order of operations for indoor air is source control first, then ventilation with clean outdoor air, with filtration as an effective supplement, and air cleaners and HVAC filters cannot remove all pollutants.
On filters, EPA says choose at least MERV 13, or as high as the fan and filter slot can accommodate, and that most systems take MERV 13 without problems provided it is replaced frequently, typically every 60 to 90 days.
MERV itself is a lab minimum by particle size, so "removes 90% of your home's pollutants" is not a sentence the rating supports.
On humidity, EPA's mold guidance is to keep indoor relative humidity below 60 percent, ideally 30 to 50, readable on a $10 to $50 meter; that is mold control, not a promise a whole-home humidifier improves health.
The IAQ claims that draw regulators
EPA's Guide to Air Cleaners in the Home answers the health question with "possibly": improvements in the portable-HEPA studies it cites are typically small and not always noticeable to the individual, and the studies cover portable units, not in-duct products.
Never write "EPA-approved," "EPA-certified" or "EPA-registered" before a product: EPA neither certifies nor recommends any brand of air filter or air-cleaning device, and the establishment number on packaging identifies the factory, not an endorsement.
EPA tells consumers to avoid devices that intentionally produce ozone and says no federal agency has approved ozone generators for occupied spaces, warning that electrostatic precipitators, ionizers, UV lights without adequate lamp coatings and plasma units may also emit ozone.
It points to low-ozone lists kept by the California Air Resources Board and the Association of Home Appliance Manufacturers, and it says duct cleaning has never been shown to actually prevent health problems, recommending it only as needed.
The honest substitute for "kills 99.9% of viruses" is attribution: quote a manufacturer's tested claim as the manufacturer's.
Sell it EPA's way
- Source control, then ventilation, filtration as the supplement.
- MERV 13, or the highest the system takes.
- Humidity 30 to 50 percent for mold control.
- Devices from the CARB or AHAM low-ozone lists.
Not this
- "EPA-approved" or "EPA-certified" anything.
- Virus-kill or allergy claims of your own.
- Routine duct cleaning as preventive care.
- Ozone generators in occupied spaces.
The federal standard behind the claim
The FTC's Health Products Compliance Guidance (December 2022) requires substantiation for every objective claim before the ad runs and expects competent and reliable scientific evidence behind health and safety claims, judging an ad by its overall impression, implied claims included.
It names foods, supplements and drugs, not air purifiers, so say the FTC expects scientific evidence for health claims, not that it has ruled on UV lights.
"Up to" claims follow the same logic: in 2012 the FTC settled with five replacement-window marketers over exaggerated energy-savings claims, taking the position that an "up to" savings claim needs evidence that all or almost all consumers are likely to achieve the maximum.
Those orders bind those five companies, and HVAC energy savings claims covers that category, but the pattern is the one a health claim already has to meet.
The payoff is revenue per job, which average ticket measures: an IAQ add-on raises it with no new customer acquisition cost.
- Quote a manufacturer's tested claim as the manufacturer's.
- Drop "EPA-approved": EPA certifies no air cleaner.
- Treat "up to" savings as needing evidence almost all buyers reach the maximum.
- Put every offer condition next to the offer, not behind an asterisk.
- Confirm California in-duct electronics are on CARB's certified list.
- Cite each rule with its date; your attorney confirms the current text.
Selling IAQ add-ons without overclaiming
The offer that survives scrutiny sells what EPA names: filtration upgrades, humidity control framed as mold control, and source-control walkthroughs; maintenance visits are the natural venue, and the membership offer at HVAC maintenance agreements is where IAQ attach usually starts.
Bundled offers carry their own guide: under the FTC's guides on "free" offers (16 CFR 251), the buyer must pay no more than the regular price for the tied item, the seller cannot recover the cost by inflating it, and every condition sits next to the offer, not in an asterisk footnote.
It also says tying a "free" item to a product usually sold at a negotiated price is improper, which is close to "free air purifier with a new system" when system prices are quoted job by job, so clear such offers with your attorney.
Repair-call add-ons meet the Cooling-Off Rule (16 CFR 429.0(a)(3) and (a)(5), as of September 30, 2026): a requested repair visit can be excluded from the three-day right to cancel, but goods sold during it beyond the repair parts are a separate sale under the rule's text.
California adds a product rule: since amendments effective October 1, 2020, electronic in-duct air cleaning devices must be CARB-certified before sale in the state, so confirm the device is on CARB's published list first.
IAQ sales in the funnel you run
IAQ sells as a second offer inside jobs your marketing already books: the maintenance visit, the repair, the estimate.
Illustrative: IAQ attach on jobs you already run
Model the taper from your own tickets, and close with demonstration: a meter reading next to EPA's 30 to 50 percent band, a MERV rating next to EPA's recommendation, a CARB or AHAM listing when ozone comes up.
Frequently asked questions
Can an HVAC company say an air purifier kills viruses?
Only by attributing the claim to the manufacturer's own test data, and only if that data exists. The FTC expects competent and reliable scientific evidence behind health claims, and an unattributed slogan in your ad becomes your claim.
Is there a way to measure indoor air quality in a home?
Humidity is the easy one: EPA notes an inexpensive meter, $10 to $50, reads it, and condensation on windows, walls or pipes can signal high humidity. EPA's mold guidance is to keep relative humidity below 60 percent, ideally between 30 and 50 percent.
Do air purifiers help with allergies and asthma?
EPA's answer is 'possibly': the studies it cites of portable HEPA cleaners found improvements in one or more symptoms, not always major and not in all symptoms. EPA also says it neither certifies nor recommends any brand of air cleaner.
Is duct cleaning a good IAQ upsell?
It is not the offer EPA backs: EPA says duct cleaning has never been shown to actually prevent health problems, recommends cleaning only as needed, and warns consumers away from companies making sweeping health claims about it. Sell it as a targeted fix, never as routine preventive care.
Can I advertise a free air purifier with a new system?
The FTC's guide on free offers requires the buyer to pay no more than the regular price for the system and the offer's conditions to sit next to the offer, and it says tying a free item to something usually sold at a negotiated price is improper. That guide raises the issue rather than banning the offer, so clear it with your attorney first.