Is Air Conditioning Safe For Babies? Nursery Cooling And Safety Guide

On hot summer nights, nurseries can become uncomfortable very quickly. Heat comes in through windows and roofs, gets trapped upstairs, and stays even after it cools down outside.

Understandably, parents might think about using air conditioning, especially when open windows, curtains, and fans aren’t enough to keep the room cool.

But is it safe to use air conditioning for babies?

You can safely use air conditioning in a nursery if the system is clean, well-maintained, properly installed, and set to a moderate temperature.

The key is to prevent the room from getting too hot or too cold, avoid blowing air directly on your baby, and keep following safer-sleep guidelines.

Please note: this guide covers room cooling and air-conditioning use. It does not replace advice from your GP, health visitor or NHS 111.

What Temperature Should A Baby’s Room Be?

The NHS and The Lullaby Trust recommend keeping a baby’s sleeping environment between 16°C and 20°C where possible. Overheating can increase the risk of sudden infant death syndrome, commonly known as SIDS.

That range can be difficult to maintain during very hot weather, especially in:

• south-facing bedrooms
• upstairs or loft-conversion nurseries
• modern, highly insulated homes
• rooms with large areas of glazing
• properties with limited cross-ventilation
• urban homes affected by noise or outdoor air pollution

The temperature doesn’t have to stay at one exact number all night. The recommended range is meant to be practical, not to make the nursery feel like a laboratory.

Use a good nursery thermometer to check the room’s temperature yourself. The number on the air conditioner might only show the temperature near the unit, not by the cot.

Is Air Conditioning Bad For Babies?

There is no general rule stating that babies cannot sleep in an air-conditioned room.

The greater concern is how the system is used.

Potential problems can arise when:

• the room is made excessively cold
• powerful airflow is aimed directly at the baby
• the filters are dirty
• the system has not been maintained
• temperature settings change dramatically
• bedding is not adjusted after the room cools
• electrical cables or portable units are placed within reach
• a poorly installed system leaks water or develops microbial growth

A split-system air conditioner correctly sized for the room provides better temperature control than repeatedly switching between a hot room and a very cold one.

Jargon Buster: Split-System Air Conditioner
An air conditioning system where the main components are separated into two parts: an outdoor compressor unit and an indoor wall-mounted unit, providing quieter and more efficient cooling.

Do Not Aim The Air Conditioner Directly At The Cot

The indoor unit should not blow a continuous stream of cold air across the baby’s face, body or sleeping space.

The Lullaby Trust gives similar advice for fans, recommending that they be used to cool the room without being directed towards the baby.

For a wall-mounted air conditioner:

• position the cot outside the unit’s direct airflow path
• direct the louvres upwards or across the room
• use a lower fan speed overnight
• enable a sleep or quiet mode where available
• avoid positioning the indoor unit immediately above the cot

The aim is to cool the whole nursery evenly, not to blast cold air into one spot.

An Engineer’s View

“When cooling a nursery, the position of the indoor unit is just as crucial as the temperature setting. We always ensure the louvres are directed away from the cot to provide gentle, ambient cooling without creating uncomfortable draughts.”

– Rhys Powell, Engineer

Avoid Setting The Temperature Too Low

Setting the thermostat to the lowest temperature won’t cool the room any faster. It just makes the system run until the room gets much colder.

Start with a moderate setting and use a nursery thermometer to see how the room responds.

Setting the air conditioner to 18°C doesn’t mean every part of the nursery will be exactly that temperature.

Things like room size, insulation, sunlight, and airflow can cause differences.

Check the temperature near the cot before deciding whether the room needs more cooling.

Adjust Your Baby’s Clothing And Bedding

Cooling the nursery is just one part of keeping your baby comfortable. Make sure their clothing and bedding match the room’s temperature.

The Lullaby Trust recommends using lighter clothing and bedding during warm weather and checking the guidance supplied with baby sleeping bags to select an appropriate tog rating.

Don’t check your baby’s temperature by touching their hands or feet. These can feel cool even if your baby is comfortable.

Instead, feel your baby’s chest or the back of their neck. If their skin feels hot, sweaty, or clammy, take off a layer and check the room temperature again.

The cot should also remain clear of pillows, bumpers, loose bedding, toys and other unnecessary items. Babies under six months should sleep in the same room as their parent or carer for every sleep, according to safer-sleep guidance.

Can Air Conditioning Make A Baby Ill?

Air conditioning does not create colds. Viruses cause colds.

But if the room is uncomfortable, it can still bother your baby’s nose, throat, eyes, or skin. Strong airflow and very cold air can feel dry, and dirty filters can make the air quality.

To reduce potential problems:

• keep the filters clean
• have the system serviced as recommended
• avoid extreme temperature settings
• do not direct airflow towards the cot
• watch for signs of dampness or water leakage
• ventilate the property safely when conditions allow

Speak to a GP, health visitor or pharmacist if you are concerned about your baby’s breathing, temperature or general health. According to the NHS guidance on fever in children, you should request an urgent GP appointment or call NHS 111 if a baby under three months has a temperature of 38°C or higher.

Does Air Conditioning Dry The Air?

Air conditioners remove some moisture from the air while cooling. This helps in hot, humid rooms, but if the system runs constantly or is set too low, the room can feel dry.

Dry air may contribute to irritated eyes, dry skin or nasal discomfort in some people.

Do not add a humidifier solely because the air conditioner is running. Measure the room’s humidity first and seek professional or medical advice if dryness is causing concern.

Additionally, too much humidity can cause condensation, dust mites, and mould.

Check the nursery first and ask a professional or doctor if you’re worried about dryness.

Keep The Air-Conditioning System Clean

Filters pick up dust and debris from the air, but they won’t work well if they get clogged and aren’t cleaned for months.

The homeowner should follow the manufacturer’s instructions for cleaning or replacing accessible filters. A qualified air-conditioning engineer should inspect and service components that require access for servicing.

Maintenance may include checking:

• filters
• evaporator coils
• condensate drainage
• fan operation
• electrical connections
• refrigerant performance
• signs of leakage, dirt or microbial growth

Don’t ignore a musty smell, strange noises, weak airflow, or water dripping from the indoor unit.

Is A Split-System Or Portable Air Conditioner Better For A Nursery?

A professionally installed split-system air conditioner is generally easier to operate quietly and securely than a portable appliance.

The main body of a split system remains outside, while the indoor unit is mounted high on the wall. There is no large appliance taking up nursery floor space and no flexible exhaust hose that must be routed through an open window.

A split system can also offer:

• more consistent temperature control
• quieter night-time operation
• programmable timers
• lower fan settings
• adjustable airflow
• sleep modes
• heating during colder weather, depending on the model

Portable air conditioners can cool the nursery for a short time, but they come with extra considerations.

Keep the appliance, cable and exhaust hose well away from the cot. Make sure it cannot be pulled over and that the window arrangement does not create a security, entrapment or fall risk.

Never cover a portable unit or connect it through an unsuitable extension lead.

Should You Leave Air Conditioning On All Night?

An air conditioner can run overnight when the system is suitable for the room and is being used correctly.

Useful settings may include:

• sleep mode
• quiet mode
• automatic fan control
• a moderate temperature
• a timed shut-off
• reduced fan speed
• adjustable louvre direction

Some sleep modes gradually adjust the temperature during the night rather than holding an aggressively cold setting.

Don’t just rely on a timer. Check the nursery temperature before bedtime and again when you check on your baby. The room can change as it gets cooler outside or when the sun goes down.

Other Ways To Keep A Nursery Cool

You don’t have to rely only on air conditioning.

UK hot-weather guidance recommends reducing heat entering the home and switching off unnecessary sources of internal heat.

During warm weather:

• close curtains or blinds before direct sunlight reaches the room
• open windows when it is safe and cooler outside than inside
• close windows when outdoor air becomes hotter than the room
• turn off unnecessary lights and electrical equipment
• keep internal doors open where this improves safe airflow
• use external shading where practical
• avoid running heat-producing appliances near the nursery
• cool the room before bedtime

The NHS also recommends using a nursery thermometer and, where it is safe to do so, keeping the baby’s bedroom door open or opening the window.

These steps can make it easier to cool the room and help your air conditioner work better.

Signs That Your Baby May Be Too Hot

Check your baby regularly during hot weather. Do not rely only on the room thermometer, as clothing, bedding and airflow can also affect how warm they feel.

Possible signs that your baby is too warm include:

• a hot chest or back
• sweating
• clammy skin
• flushed skin

Check your baby’s chest or the back of their neck rather than their hands or feet. Remove a layer of clothing or bedding if they feel hot or clammy, then check them again.

Contact a GP or NHS 111 if you are concerned about your baby’s health. Call 111 or your GP surgery urgently if a baby under three months has a temperature of 38°C or higher.

Call 999 if your baby is struggling to breathe, is difficult to wake or appears seriously unwell.

Choosing Air Conditioning For A Nursery

Nursery air conditioning should be selected around the room rather than simply choosing the smallest or cheapest system available.

An installer should consider:

• the nursery’s dimensions
• ceiling height
• window size and orientation
• insulation
• floor level
• heat entering from the roof
• occupancy
• desired noise level
• indoor-unit placement
• condensate drainage
• access for cleaning and servicing

A system that’s too big can cool the room too quickly and keep turning on and off. One that’s too small might run constantly but still not keep the room cool enough.

Correct sizing helps create steadier, quieter and more efficient cooling.

Create A More Comfortable Nursery With WarmZilla

Air conditioning can help stop a nursery from getting too hot, but it’s just a tool for cooling the room. It shouldn’t replace safer-sleep advice.

Keep the room at a moderate temperature. Use a separate thermometer. Adjust clothing and bedding appropriately. Most importantly, position the cot away from direct airflow.

WarmZilla supplies professionally installed split-system air conditioners with clear online pricing and installation by qualified F-Gas engineers.

Complete WarmZilla’s online air-conditioning survey to compare systems suited to your property and the room you need to cool.

Frequently Asked Questions

What Is The Safest Air-Conditioning Temperature For A Baby?

UK safer-sleep guidance recommends a room temperature of approximately 16°C to 20°C for babies. Use a separate nursery thermometer, as the temperature shown on the air conditioner may not represent conditions beside the cot.

Can A Newborn Sleep In An Air-Conditioned Room?

A newborn can sleep in an air-conditioned room when the temperature is moderate, the system is clean, and airflow is not directed at the baby. Continue following safer sleep guidance and adjust the baby’s clothing and bedding to match the measured room temperature.

Can Air Conditioning Cause A Cold In A Baby?

No. Colds are viral infections and are not caused by air conditioning. However, very cold temperatures, strong airflow or a poorly maintained system may make the room uncomfortable or irritate sensitive noses, eyes and skin.