The bedroom has the worst air in the house

That sounds odd until you think it through. A bedroom door is usually shut, the window usually shut, and one or two people breathe inside it for eight straight hours. No other room does that.

A living room holds more people, but the door is open, people come and go, and air keeps moving. A bedroom is the only space in the home that is both sealed and occupied for a long stretch.

So carbon dioxide accumulates all night. Waking heavy-headed, unrested, and slow to come round is partly this — not simply a shortage of hours.

This is not the same problem as the living room

When air in the dining room goes off, you notice and can open a window. What makes a bedroom different is that you are asleep. There is no point in the process at which you can react, and you will not remember it either.

So bedroom automation carries a requirement the others do not: it has to be silent. Waking you at 3am to ventilate trades one problem for another. That is why the approach here differs from every other room.

What one night actually looks like

1. 22:30

   Lights out

   620 ppm, comfortable. The system knows you are asleep and switches to night behaviour: slightly relaxed thresholds, much gentler actions.

2. 00:10

   First time over the line

   It reaches 900. The powered window opens a five-centimetre gap, or the fresh-air unit drops to its lowest speed. The movement is small and you do not stir.

3. 00:40

   Back down

   Under 700, so the window closes again. Thirty minutes start to finish, and you have no idea it happened.

4. 03:00 and 05:00

   Twice more

   Three or four cycles across a night is typical. Each is the same small action, pushing the line back into range.

5. 07:00

   Morning

   The room reads 950 rather than 2500. The difference is not in how long you slept but in what you were breathing when you woke.

Four things it takes care of

Different rooms, different thresholds

What you need to have

How the whole thing works

Use the ready-made blueprint

The hub ships with 22 tested automation blueprints — think of one as a fill-in-the-blanks form. This uses greenhouse, the same one as the other air quality scenarios; what changes is the numbers and the conditions.

Just say the word

The WOOWTECH hub ships with HA-MCP, so an AI can connect straight into your system and do the work: find the sensor, build the rule, then test it once itself and only report back after confirming the room really does get ventilated in silence.

Prompts you can copy straight out

Every block below can be copied whole, using the button on the right. Pick the one closest to what you want. There is no need to use them all.

There is a CO2 sensor in my bedroom. When it goes above 900 overnight,
ventilate the room quietly and stop once it is back under 700.
Do not send me any notifications. I am asleep.

I want overnight ventilation for the bedroom. There is a CO2 sensor by
the bed, please find that first.
Ventilate with the powered bedroom window, opening it about five
centimetres and never fully. If there is a fresh-air unit, use that at
its lowest speed instead.
Start above 900, stop below 700, and only run between 22:00 and 07:00.
Turn notifications off completely. Nothing may reach my phone overnight,
anything I need to know can wait until morning.
Also watch the outdoor temperature. Below 15 degrees, shorten each
cycle, or switch to the fresh-air unit rather than opening the window.
Once it is built, test it yourself, confirm it really works, then tell
me which devices you used.

There is a cot in our bedroom and the baby sleeps with us, so make the
ventilation more active.
Start at 800 rather than 900, and keep going until it is under 650.
Make every movement smaller and slower though: open the window about
three centimetres, and rather run longer than open it wide.
Keep notifications off.

Please adjust the overnight bedroom ventilation.
Mornings still feel stuffy, so bring the threshold down from 900 to 800.
Also let it start earlier, from 21:30, because I have been going to bed
sooner lately.

Twice lately I have woken up to the sound of a window opening, and I
suspect the overnight ventilation is behind it.
Pin the times down for me first: which two nights, what time to the
minute, and how long the window stayed open each time.
If it really was that rule, take it in a quieter direction - slow the
motor down, or split one five-centimetre opening into two or three
smaller steps. Failing that, leave the window alone during the hours I
sleep deepest and lean on the fresh-air unit instead.
Go with whichever you judge to be quietest, and list anything else that
makes noise overnight so I can look at those too.

Common questions