The difference between a class and a gasp.
Hot yoga, spin, HIIT and small studios generate extreme humidity and CO₂ loads. Envora tells you how your ventilation is holding up — live, per-room, per-class.
A boutique studio is the highest-density indoor environment most members will ever pay to enter.
Heat, humidity, breath. All measurable.
A boutique studio is one of the highest-density, highest-demand indoor environments on earth. Thirty bodies at 12 MET in a sealed room can push CO₂ past 3,000 ppm and humidity past 80% within twenty minutes. Heat-pump HVAC has to react in real time. The operator has to know.
Envora sits at the back wall of the studio, streams live, and feeds the BMS the demand signal it needs. When a room reaches its ceiling, the fans pre-ramp — not as a scheduled event, but because the room called for it. Members feel the difference. Retention follows.
It also protects equipment. Above 70% humidity, bearings, electronics, mats and spring floors degrade faster. Envora helps operators decide between upgrading ventilation and replacing a £4,000 bike a year early.
Five problems your retention metric hides.
The peak-class collapse
Thirty bodies cycling hard in a sealed spin room hit 3,000 ppm CO₂ and 80% RH in 20 minutes. It is a performance ceiling you can measure — and therefore raise.
Humidity-driven equipment wear
Above 70% humidity, bearings, electronics and mats degrade faster. Measure it, budget for it, or upgrade the ventilation instead.
HVAC without a demand signal
Modern air-source heat pumps need a real fresh-air demand to react to — not a fixed schedule. Envora is that input, live, per-room.
Post-class turnaround
Between a 7 AM and an 8 AM class you have ten minutes. Envora tells you whether the room is actually ready for the next cohort or whether they will walk into the last one's air.
Reception and changing-room comfort
CO₂ in reception, humidity in changing — both shape whether members linger or leave. Both measurable, both tunable.
CO₂, humidity, PM, sound — in the order they hit a class.
Forty-five minutes, measured.
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00:00 Doors open
Baseline · CO₂ 550 ppm · RH 45%. Fans at quiet setting.
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05:00 Warm-up
Breathing load rises · CO₂ trends through 800 ppm.
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15:00 Peak interval
CO₂ passes 1,500 ppm · Envora demand signal boosts fan speed preemptively.
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30:00 Cool-down
Room still at 1,800 ppm · fans stay high · next class door timer starts.
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40:00 Turnaround
Envora tracks CO₂ and RH · green-light for next class only when both in band.
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45:00 Next class
New cohort walks into fresh air · retention quietly improves.
Five live signals for the floor manager.
- Studio CO₂ above 1,800 ppm during class
- Humidity above 70% for more than 15 minutes
- Sound above 95 dBA during peak cue
- Post-class PM2.5 fails to clear below 10 µg/m³ before next class
- Changing-room humidity sustains above 75%
What a measured studio delivers, every class.
Three placements. One per studio room.
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Each studio room× 1Non-negotiable — the demand signal for that room's ventilation.
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Reception · foyer× 1Members' first impression is air quality more than aesthetics.
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Changing rooms× 1Humidity band and post-shower recovery.
What studio air quietly does to gear and members.
We used to rely on complaints. Now we see the 2 PM spin-room peak coming and the fans pre-ramp. Classes feel different — and members tell us, unprompted.
Studio pack — per-room
Pre-configured for studios & gyms. Deploy in an afternoon. We send the spec, the price and a fit-out note within one UK business day.
No deposit · Reply within one UK business day · 25% discount for schools and charities.
Tie ventilation to the class clock.
A demand-led signal for every cardio room, plus per-room reports for the operations team. Envora Fleet from £19/month.
Pilot pricing for boutique studios · 6-month retention pilots welcome.