New parents often notice for the first time how hot their home gets in summer. A small back bedroom under the roof can sit well above comfortable on a warm night, and the baby is the one sleeping in it.
This guide explains how air conditioning can help keep a nursery within the NHS guidance and how to set it up so it doesn’t create new problems. We’re engineers, not health visitors. For everything about safe sleep, follow the NHS guidance on reducing the risk of SIDS and ask your midwife, health visitor or GP.
What the NHS says about room temperature
The NHS SIDS page advises keeping the room at a temperature between about 16 to 20°C and monitoring it with a room thermometer. It says overheating can increase the risk of SIDS, and that babies can overheat because of too much bedding or clothing, or because the room is too hot. It also says babies should never sleep next to a radiator, heater or fire, or in direct sunlight.
Air conditioning doesn’t change any of that advice. It’s a tool that can help you keep the room in the recommended range when the weather won’t cooperate.
Use a thermometer at cot height
The temperature on an air conditioning remote is the target the system is aiming for, measured at the indoor unit, usually high on the wall. The air where the baby sleeps can be different. A simple room thermometer placed near the cot (not in direct sunlight or next to the unit) tells you what really matters. Set the system by what the thermometer shows, not by the number on the remote.
Airflow away from the cot
Cool air should mix gently into the room, not blow onto the baby. When we plan a nursery installation we:
- place the indoor unit so it doesn’t sit directly above or point at the cot;
- set the louvres to send air along the ceiling;
- suggest a low or quiet fan setting at night;
- check curtains and furniture won’t block the airflow and make the system work harder.
If the room is small, it may be best to move the cot rather than compromise the unit position. We can talk that through at survey.
Quiet running for light sleepers
Wall-mounted split systems are much quieter indoors than portable units, because the compressor sits outside. Most manufacturers offer a quiet or night mode that lowers the fan speed. Check the published sound figures for the model, which our noise levels guide explains, and think about where the outdoor unit goes so it isn’t under the nursery window.
Want it done properly? AirCon Doctor installs, repairs and services air conditioning and heat pumps across London and the South East, from our base in East Grinstead. We’re an F-Gas certified company and NICEIC approved. Get a fixed-price quote.
Avoid big temperature swings
Switching a system on at full power and then off again produces swings that are uncomfortable for anyone. A steady setting held through the night is better. Inverter systems, which almost all modern splits are, slow down as they approach the set temperature instead of cycling hard on and off. A timer can bring the room into range before bedtime, so you’re not starting from a hot room.
Winter: heating the nursery
Most split air conditioning systems are air-to-air heat pumps and can heat as well as cool. In winter that means a controlled, thermostatic way to keep a nursery within range without a portable heater. The NHS advice to keep babies away from heaters still applies: the indoor unit is high on the wall and the airflow should never be pointed at the cot. Our guide to heat pump mode in winter explains how it works.
Clean filters and a tidy drain
The indoor unit’s filters trap dust. Rinse them every few weeks when the system is in regular use, more often if you have pets. An annual service cleans the coil, the fan and the condensate drain, which helps the unit run quietly and stops musty smells. See how to clean air conditioning filters.
Portable units in a nursery
Portable air conditioners are cheap to buy but noisy, because the compressor is in the room, and the exhaust hose needs a gap in the window. They also sit on the floor, where a toddler can reach them. Movable units using HFCs with a GWP above 150 are now banned in new products, so newer portables use other refrigerants. Our comparison of fixed and portable air conditioning sets out the trade-offs.
Getting a nursery system fitted
A single-room installation usually takes a day. Our single-room prices are £1,200–£2,200 + VAT, covering supply, installation, commissioning and F-Gas paperwork. We survey first so the unit, pipe run and outdoor unit go in the right places, then give a fixed-price quote. Get in touch and we’ll reply the same working day.
Quick answers
What temperature should a baby’s room be?
The NHS advises keeping the room at a temperature between about 16 to 20°C and checking it with a room thermometer.
Is air conditioning safe in a nursery?
A wall-mounted system set to keep the room in the NHS range, with airflow pointed away from the cot, is simply a way of controlling room temperature. Follow NHS safe sleep advice and ask your health visitor about anything to do with your baby’s health.
Should I trust the temperature on the remote?
Use it as a target. Check the actual temperature with a room thermometer near the cot and adjust the setting to match.
Can the same unit heat the nursery in winter?
Most split systems are air-to-air heat pumps and can heat as well as cool, giving thermostatic control without a portable heater.
Related services
- Domestic air conditioning
- Wall-mounted air conditioning
- Air-to-air heat pumps
- Air conditioning installation
More advice
- Air Conditioning for Bedrooms: Complete Guide 2026
- Air Conditioning Noise: How Quiet Are Modern Systems?
- Air Conditioning in Winter: Using Heat Pump Mode Effectively
- Air Conditioning vs Portable Air Conditioner: Which Is Better?
- All advice
This guide is general information, checked against the sources linked on 30 October 2026. It isn’t legal, tax or financial advice. Rules, grants and product ranges change, so check the current position before you rely on it.