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Whole-home scenting. [new_line] Through the existing vents.

N° 01 · Of presence

Whole-home scenting.
Through the existing vents.

The HVAC 2 was built around one question: how do five-star hotels and luxury retail flagships scent every floor, every corridor, every guest room — uniformly, invisibly, and without a single device on display? The answer is the building's own air handler. Mount the HVAC 2 to the cold-air return, and the existing forced-air system carries fragrance through every vent in the structure.

One machine. Every room. No equipment in sight.

6,000sq ft via HVAC
500mlrefillable bottle
15minaverage install
100%recycled aluminum
Schedule. Zone. [new_line] Run it from anywhere.

N° 02 · Of control

Schedule. Zone.
Run it from anywhere.

Pair by Wi-Fi. Run separate intensity profiles for business hours, after hours, and weekends. Lower the cadence at 11pm, raise it 30 minutes before opening, set a stronger guest-mode for events — all from the phone in your pocket, anywhere on the property.

Intensity
Fine 1–100 control sized for whole-building diffusion
Hours
Open / closed / event schedules per day-of-week
Refill alerts
Push notification · never run a 500 ml bottle dry
Routines
Business mode · After hours · Event boost

The ritual

How to begin.

Five steps. Five minutes. Then forget it exists.

  1. N° 01
    Mount
    MountMagnet-mount the HVAC 2 to the cold-air return of your air handler. No drilling, no electrical work.
  2. N° 02
    Connect
    ConnectConnect the included air-line tubing from the diffuser's outlet port into the return duct. The fragrance enters the existing forced-air stream.
  3. N° 03
    Fill
    FillPour your chosen Scentiment oil into the 500 ml refillable bottle. Slide it into the chamber until the magnetic seal clicks.
  4. N° 04
    Power
    PowerPlug into a standard outlet. The unit runs whenever your HVAC fan runs — circulating fragrance through every vent in the building.
  5. N° 05
    Schedule
    ScheduleDownload the Scentiment app to set hours, intensity per day-of-week, and event-mode boosts. Manage one location or many.

A quiet comparison

What sets the HVAC 2 apart.

Scentiment Others
Cold-air, waterless diffusion
Refillable bottle · no plastic pods
Whisper-quiet motor (< 25 dB)
IFRA-compliant, pet/kid safe fragrances
24/7 customer care · concierge returns
Priced for the home, not the hotel

Formulated with care

Safe for the ones at your feet.
And the ones in your arms.

Every Scentiment fragrance is IFRA-compliant and formulated without phthalates, parabens, or the essential oils known to be harmful to pets. We test each formula for pet and child safety before it ever reaches your home.

Questions we hear often

What people ask, answered.

The questions our concierge team and the internet send our way most about whole-home and commercial HVAC scenting. If yours isn’t here, write to care@scentiment.com — a real person replies within one business day.

What is the Diffuser HVAC 2?
The Diffuser HVAC 2 is a commercial-grade Scentiment cold-air diffuser built to scent large residential and commercial spaces — up to 5,000 sq ft — either standalone or integrated with an existing HVAC system. It atomizes pure fragrance oil into a dry micro-mist with no water, no heat, and no aerosol propellants, so the full molecular profile of every oil reaches every room. Pairs with our refillable 500 ml fragrance oil bottle for long unattended run-time, with daily schedules, intensity control, and refill alerts via the Scentiment app.
How is the Diffuser HVAC 2 different from our other diffusers?
The Diffuser HVAC 2 is the only Scentiment diffuser built for whole-building scenting via HVAC integration. Mount it near your HVAC cold-air return and the building's own air handler carries fragrance through every supply vent — one unit covers up to 5,000 sq ft, far beyond what any room-tier diffuser can reach. For comparison, see the Diffuser Air 2 (up to 1,000 sq ft, single-room aluminum cylinder for bedrooms, studios, and offices), or the Diffuser Pro 2 (up to 2,000 sq ft, open-plan flagship for whole-house and commercial spaces). All pair with the same Scentiment app and fragrance oil library.
How long does a 500 ml bottle last in the Diffuser HVAC 2?
A 500 ml bottle lasts approximately 6–9 months on default Medium intensity at 12 hours per day — run-time scales with three things: intensity setting, daily run hours, and room size. Low intensity stretches each bottle substantially further; High intensity (used before guests arrive or in rooms with active airflow) shortens it. Auto-replenishment in the Scentiment app ships refills before you run out.
How much area does the Diffuser HVAC 2 cover?
The Diffuser HVAC 2 is rated for up to 5,000 sq ft with normal residential ceiling heights (8–10 ft). It's the right tier for hotels, retail flagships, spas, gyms, restaurants, offices, and large open-concept homes. If your space is a different size, see Diffuser Air 2 (up to 1,000 sq ft) or Diffuser Pro 2 (up to 2,000 sq ft). Coverage assumes a normally insulated room with average air circulation; open-plan layouts, vaulted ceilings, or rooms with constant airflow may need a step up in tier.
How loud is the Diffuser HVAC 2?
The Diffuser HVAC 2 runs intermittently and is significantly quieter than the HVAC system it taps into. The pump burst is brief and the unit lives near the air handler — most installations are inaudible from occupied rooms because the air handler itself is louder.
Is the Diffuser HVAC 2 safe for pets, children, and people with allergies?
Yes. Every Scentiment fragrance is IFRA-certified to Category 11 (the strictest air-care tier) and formulated without phthalates, parabens, formaldehyde, California Prop 65 reproductive toxins, and the essential oils most commonly cited as toxic to cats and dogs (tea tree, pennyroyal, pine, wintergreen, sweet birch, concentrated citrus). Cold-air diffusion produces no heat, no combustion byproducts, and no surface residue — important for nurseries, beds, and pet spaces. We disclose all 26 EU Annex III fragrance allergens on each scent's product page so families with sensitivities can choose accordingly.
How do I clean and maintain the Diffuser HVAC 2?
Maintenance is minimal. Whenever you change scents, run a brief cleaning cycle with 70% isopropyl alcohol — pour a small amount into the empty bottle, run the Diffuser HVAC 2 for 5–10 minutes on High, then dry. This clears residual oil from the air channel so the next scent comes through clean. Wipe the exterior with a soft microfibre cloth (no harsh solvents, no water inside the air pump). The bottle can be rinsed with warm water and a drop of mild dish soap between scents.
Does the Diffuser HVAC 2 have an app or Bluetooth control?
Yes. The Diffuser HVAC 2 pairs with the Scentiment app (iOS and Android) over Wi-Fi and Bluetooth Low Energy. From the app you can switch between intensity settings, set daily ON/OFF schedules, run pre-arrival scenting routines, monitor estimated bottle life, and order refills. The unit also has on-device controls so it works without the app — useful for guest rooms or rentals.
Where should I place the Diffuser HVAC 2 for best results?
Mount the Diffuser HVAC 2 within 3 feet of your HVAC cold-air return so the air handler draws fragrance into the duct system and distributes it through every supply vent. Most installations place the unit on a platform or bracket near the return, with the mist nozzle pointing toward the intake grille. Avoid placing it farther than 3 feet from the return or aiming it away from the intake — the further the mist has to travel before reaching the air handler, the more it dissipates before entering the ducts. If you're also running the unit as a standalone room diffuser, any flat surface in the target room works; see the placement tips for the Diffuser Pro 2 for general open-plan guidance.
How does cold-air diffusion work, and why is it better than heated plug-ins?

Cold-air nebulizing diffusion pushes pressurized air across the surface of fragrance oil to break it into micro-droplets between one and three microns in size. Those droplets evaporate within seconds, distributing scent evenly through a room without heating or diluting the oil.

  • Versus heated plug-ins (Glade, Air Wick, Bath & Body Works): Those gently heat a wax or oil reservoir, which alters and partially destroys the top notes you actually paid for. Cold-air diffusion delivers the full molecular profile of the fragrance unchanged.
  • Versus reed diffusers: Reed diffusers rely on capillary evaporation, which is slow, uneven, and weakest in larger or air-circulated rooms. The Diffuser HVAC 2 delivers consistent intensity at the tap of a button.
  • Versus wax warmers and candles: Both involve combustion or heat and produce byproducts (soot, formaldehyde, benzene with paraffin). The Diffuser HVAC 2 emits only the fragrance itself.
How does Scentiment compare to Pura, Aera, Glade, or Bath & Body Works plug-ins?

The most useful comparison is technology, refill economics, and fragrance quality:

  • Versus Pura: Pura uses sealed proprietary capsules with a heated micro-pump in a smart plug-in housing. Scentiment uses a refillable bottle with cold-air nebulizing — no heat, no plastic capsule waste, and an open fragrance library. Both have an app; ours doesn’t lock you into capsule reorders.
  • Versus Aera Mini: Aera Mini also uses sealed proprietary capsules with a small fan. Scentiment uses cold-air pump diffusion with a refillable bottle — better long-run refill economics and a fragrance library that includes hotel-tier oils, not just retail collaborations.
  • Versus Glade PlugIns, Air Wick, Bath & Body Works Wallflowers: Those gently heat a wax or oil reservoir to evaporate fragrance — the heat alters the scent and the units run continuously, masking rather than scenting. The Diffuser HVAC 2 uses unheated cold-air diffusion at a fraction of the daily oil consumption.
  • Versus reed and ultrasonic diffusers: Reeds rely on slow, uneven evaporation; ultrasonic units mix scent with water and leave residue. The Diffuser HVAC 2 delivers a dry, consistent scent on a programmable schedule.
What’s the warranty and return policy?

The Diffuser HVAC 2 comes with a one-year limited warranty covering manufacturing defects and pump performance, plus our 30-day risk-free return. If you don’t love it within 30 days of delivery, we’ll arrange a free return shipment and refund — no restocking fee. Optional Protect+ coverage at checkout extends accidental-damage protection beyond the standard warranty. Refill bottles are non-returnable once opened for hygiene reasons but can be exchanged unopened. Read the full Refund Policy for details.

Can the Diffuser HVAC 2 run continuously, 24/7?

The unit runs on intermittent ON/OFF cycles by design — even on High it pumps for 30 seconds, then rests for two minutes — so true 24/7 operation isn’t a concern the way it is with always-on heated plug-ins. We don’t recommend leaving any diffuser running continuously for residential use, though: continuous diffusion saturates a room past the point where the human nose registers the fragrance (a phenomenon called olfactory adaptation), so you stop noticing the scent while still consuming oil. The default Medium schedule with the unit turned off overnight strikes the right balance for most rooms.

See questions answered by Scentiment customers in the reviews section.

What people are saying

Reviews from real homes.

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