Temperature & Humidity T · RH
The foundation of every other reading. Humidity drives mould risk; temperature shapes sleep.
Comfort is a range, not a number.
Humidity below 30% dries mucous membranes; above 60% it accelerates dust-mite and mould growth. The ASHRAE comfort envelope is 30–60% at 20–24 °C — Envora draws the envelope on your dashboard so you can see when you step outside it.
Built around Digital capacitive · Bosch BME690.
Envora uses the Bosch BME690 — the same digital climate-and-gas module that drives the pressure and VOC/IAQ channels. Temperature and humidity are read with factory calibration, self-heating compensated, and contribute to the fused IAQ score alongside gases and particulates.
- Technology
- Digital capacitive · Bosch BME690
- Range
- −40 to 85 °C · 0–100 %RH
- Accuracy
- ±1 °C · ±3 %RH
- Resolution
- 0.1 °C · 0.1 %RH
- Response
- < 10 s
- Units
- °C · %RH
Two channels, one foundation. Temperature shapes comfort, productivity and sleep; humidity drives mould risk, dust mite proliferation and viral persistence.
Increased respiratory illness in vulnerable groups; cardiovascular strain.
— UKHSA Cold Weather Plan
PHE acceptable lower bound for vulnerable occupants. Heating recommended.
— UKHSA
PHE recommended winter daytime minimum.
— UKHSA
ASHRAE 55 winter comfort lower bound.
— ASHRAE 55
ASHRAE 55 comfort centre. Optimal for sedentary work.
— ASHRAE 55
ASHRAE 55 summer upper bound. Slight discomfort builds for concentration tasks.
— ASHRAE 55
Office productivity drops ~2% per °C above 25 °C.
— Seppanen et al., 2006
Cognitive decline; impaired short-term memory and reaction time.
— Hancock & Vasmatzidis, 2003
Heat strain; hyperthermia risk in absence of cooling.
— WHO Heat-Health Action
Dries mucous membranes; viral particle survival increases. Static electricity.
— Sterling et al., 1985
Dry. Eye and skin irritation; scratchy throats common.
— Sterling chart
Acceptable lower. Common during winter heating.
— ASHRAE 55
Optimal range. Minimises mould, dust mite, virus persistence and respiratory irritation.
— Sterling 1985 · WHO
Acceptable upper. Comfort still good.
— ASHRAE 55
Mould growth threshold on cool surfaces. Watch bathroom and bedroom corners.
— BS 5250
Mould proliferation; dust mite optimum. Persistent condensation likely.
— WHO Indoor Air Quality
Persistent condensation. Rapid microbial and mould growth on surfaces.
— BS 5250
Practical steps, not panic.
- In winter, humidity drops fast — a small bedside humidifier at 40% can end morning sore throats.
- Above 65% in a bathroom after a shower, run the extractor for 15 minutes.
- Set Envora to alert when a bedroom drops below 18 °C at night — a strong predictor of restless sleep.
Where this channel does its best work.
Mould & damp risk
Mould does not appear from nowhere. It is the visible end of months of sustained humidity your house has been trying to tell you about.
Read the guideAllergies & dust sensitivity
Dust mites, pollen, pet dander and chemical irritants all have fingerprints. Envora reads them so you can manage the triggers, not just the symptoms.
Read the guideSleep & bedroom air
The most important seven hours of your day happen in the room you measure the least. CO₂ triples overnight; humidity plummets; light and sound shape every sleep cycle.
Read the guideWinter dry air
Winter heating in the UK regularly drops indoor humidity below 25%. Sore throats, cracked furniture, increased infection risk — all avoidable once you can see the number.
Read the guideT · RH, plus 10 more channels.
Envora One ships Temperature & Humidity alongside ten other channels, fused into one IAQ score and calibrated at our bench. £249 one-time. Free for personal households.
Free UK & EU shipping · 2-year warranty · 30-day returns · Reply within one UK business day.