Introducing Nostaira. Scenting Moments that Matter. Free shipping on every subscription order 18 founding scents · a new story every month

The system

Ten minutes to a scented home.

No flames, no plug-in haze, no fans you can hear. The system sits beside your HVAC return and quietly carries scent through every room.

The Nostaira Scent Unit mounted beside the furnace, tubing into the HVAC supply duct
Installed on the supply side of your HVAC, where it quietly scents the air your home already moves.
HVAC air movesThe unit connects at the supply side and uses the air your home already circulates.
Cold diffusion scentsNo heat or flame. A 500ml story diffuses according to your intensity setting.
Your phone controls itAdjust intensity, set schedules, and swap stories from the Scent Tech app.
01

Place it beside your HVAC return

The unit connects to any system with a 4-6″ return duct, common to most central air systems in North America. No plumbing, no rewiring. Average install: ten minutes. No HVAC? Standalone options are coming soon.

02

Fill it with a story

Each 500ml bottle refills by hand. Duration depends on your intensity setting, usually about three to six weeks. To change scents, rinse the bottle with a little rubbing alcohol, then pour in your next story.

03

Control it from your phone

Use the app to adjust scent intensity, set schedules, check remaining days, and swap bottles when you want a different story in the air. Larger homes can pair two devices.

The Nostaira diffuser in a softer, morning-light entryway

The same diffuser, a quieter morning. Once it's installed, it recedes into the room. No cords in view, no upkeep beyond swapping in a new story each month.

Open the step-by-step setup guide →

Good to know

Questions before you install.

The things people ask most about the system and where it goes.

Will it fit my HVAC system? ▾
It fits any HVAC system with a 4 to 6 inch return duct, common to most central air in North America. Not sure about yours? Send a photo of your unit to the concierge and we will confirm within a day.
Where exactly does it install? ▾
On the supply side of your HVAC, near the furnace, where it scents the conditioned air moving out to your rooms. You drill one 1/2 inch hole in the supply duct (never the return or intake side). Average install is about ten minutes. The step-by-step setup guide walks you through every part.
Do I need HVAC at all? ▾
Right now, yes. The system integrates with your HVAC, where one device covers up to 5,000 sq ft and larger homes can pair two. A standalone option is coming soon.
Can I install it myself? ▾
Most people do, in about ten minutes. You will need an electrical outlet near the furnace. If you would rather not drill, reach out to your local HVAC company and they can mount it for you.
Is it safe? Any heat or flame? ▾
None. It uses cold air diffusion, so there is no heat, no flame, and no fans you can hear.
How often do I refill, and how do I change scents? ▾
A 500ml story usually lasts about three to six weeks, depending on the intensity setting you choose in the app. The app also shows your remaining days. To change scents, unscrew the bottle, add a little rubbing alcohol, swish and empty it, then pour in your next story. Buy a story anytime or subscribe so a fresh one arrives before you run out.

Still have a question? Ask Aira, your concierge, or email hello@nostaira.com.