Indoor Air Quality Service Bundle
Why this matters
Indoor air quality is the fastest-growing add-on segment in residential HVAC. Customer concern over COVID, wildfire smoke, allergens, + Sick Building Syndrome drove 2020 - 2024 IAQ product sales 200%+ growth. Per-customer add-on revenue. Tech-trained operators capture the upsell at every service visit + maintenance call. This is the working framework for the IAQ category.
The IAQ problem categories
Particulate - dust, pollen, pet dander, wildfire smoke, mold spores. Solution: filtration.
Microbial - bacteria, viruses, mold growth. Solution: UV sterilization + filtration + humidity control.
VOC + chemical - paint fumes, cleaning products, formaldehyde, off-gassing. Solution: ventilation + activated carbon filtration.
Humidity - too dry (winter) OR too wet (summer + basement). Solution: humidifier OR dehumidifier.
Radon - gas seeping from ground. Solution: separate mitigation system (see Radon Mitigation Basics).
CO + combustion byproducts - gas appliances, fireplaces. Solution: detection + ventilation + appliance service.
Equipment categories + pricing
Media filtration upgrades
- 1" pleated filter (MERV 8 - 11). Standard upgrade.
- 4 - 5" media cabinet (MERV 11 - 13).
- HEPA bypass system (MERV 17+).
- Customer cost.
Electronic air cleaner
- Electrostatic precipitator (cleanable plates). Customer cleans plates monthly.
- Older technology; less common in new installs.
UV sterilization
- Coil UV (deactivates microbial on coil + drain pan). 1-year bulb life.
- Air-stream UV (sterilizes passing air). 1-year bulb life.
- Customer cost.
Ventilation (ERV / HRV)
- Energy Recovery Ventilator (transfers heat + moisture).
- Heat Recovery Ventilator (transfers heat only).
- Critical for tight homes (IECC 2024+ ACH50 ≤ 2.5).
- See Indoor Air Quality ERV/HRV for full reference.
Humidification
- Bypass humidifier (passive).
- Powered flow-through (active).
- Steam humidifier (premium).
- Maintenance: pad replacement annually; filter cleaning.
Dehumidification
- Portable: customer-DIY. Not a sales target.
- Whole-home dehumidifier (Aprilaire, Honeywell, Santa Fe).
- Best for: 50%+ humidity climates, basement-prone homes, hyper-allergy customers.
- See Whole-House Dehumidification reference.
Activated carbon filtration
- Specialty: VOC + chemical reduction.
- Niche customers (chemical sensitivity, near factory, etc.).
Air quality monitoring
- IAQ sensor (CO2, PM2.5, VOC, humidity).
- Integrated with smart thermostat OR standalone.
- Sales tool: customer SEES their air quality + considers upgrades.
The IAQ sales conversation
Stage at customer visit:
- Discovery: "Anyone in the household have allergies, asthma, or sensitivity to dust?"
- Education: brief explanation of what current filter does + what's missed
- Tier presentation: Good / Better / Best with prices + benefits
- Customer-specific recommendation based on their priorities
Most customers don't realize IAQ is an option. The 5-minute conversation transforms 10 - 25% of service calls into IAQ sales.
Sizing IAQ for customer house
Filtration sizing:
- Filter face area: minimum 2 sq ft per ton of cooling
- Static pressure budget: most residential AHUs handle 0.5" - 1" total static
- High-MERV filter raises static; verify pressure across filter < manufacturer spec
UV sizing:
- Coil UV: one lamp per evaporator coil
- Air-stream UV: power level scaled to airflow CFM
Ventilation (ERV/HRV) sizing:
- ASHRAE 62.2: 7.5 CFM per occupant + 3 CFM per 100 sq ft
- E.g., 4 occupants + 2,000 sq ft = 30 + 60 = 90 CFM minimum
- Larger sizing for higher-quality outcome
Humidification sizing:
- Target: 35 - 45% indoor RH in winter
- Required moisture: depends on outdoor temp + air exchange rate
- Manufacturer charts provide load calculation
Dehumidification sizing:
- Target: 45 - 55% indoor RH summer
- Whole-home unit: 60 - 200 pints/day capacity
- Sized by house volume + design temperature + load
Combination IAQ packages
Standard residential bundles:
Bronze IAQ:
- MERV 11 4" media cabinet + filter
- Annual filter service contract
Silver IAQ:
- MERV 13 4" media cabinet
- Coil UV
- Smart thermostat with IAQ sensors
Gold IAQ:
- HEPA bypass OR MERV 16 media
- Coil + air-stream UV
- Whole-home humidifier (where applicable)
- ERV ventilation
- IAQ monitoring + alerts
Platinum IAQ:
- All Gold items
- Whole-home dehumidifier
- Activated carbon stage
- Multi-zone IAQ optimization
Common installation mistakes
Wrong filter for application: customer wants MERV 16 but old AHU can't push the static. Damages compressor over time.
UV exposure to occupied space: UV light leaks where it shouldn't. Eye + skin hazard.
Improper ventilation balancing: ERV over-pressurizes house, OR under-pressurizes draws CO into house.
Humidifier in non-conditioned space: bypass humidifier outdoors freezes + bursts.
Dehumidifier drain configuration: improper drain causes water damage to ceiling.
Annual IAQ service contract
Pair IAQ install with maintenance:
- Filter replacement (4x/year typical)
- UV bulb replacement annual
- Humidifier pad change annual
- Dehumidifier filter change annual
- IAQ sensor calibration
Revenue per IAQ customer. Sticky.
The single highest-converting IAQ sales tactic is the FILTER REVEAL - physically pulling out the customer's current filter at a service call + showing them the dust + pollen + pet hair caked on it. Customer sees the problem viscerally. The conversation then becomes "would you like me to install a system that catches significantly more of this?" Closing rate: 25 - 45% on the spot. Costs nothing; just requires the tech to remove + display the filter rather than silently replacing it.
References
- ASHRAE Standard 62.2 (residential ventilation)
- ASHRAE Standard 52.2 (filter testing)
- EPA Indoor Air Quality guidance
- AHAM (Association of Home Appliance Manufacturers) IAQ ratings
- Manuall internal: MERV Ratings + Air Filtration, Indoor Air Quality ERV HRV, Whole-House Dehumidification