Why Your Home Feels Cold in March Despite Spring Sunshine

Behind this contradiction lies a rather stubborn combination of physics and indoor climate.

Blue skies outside, cold fingers indoors: many people recognise the feeling as soon as the first pleasant spring days arrive. Everything looks perfect for a terrace, coffee and a T-shirt, yet indoors the home feels like a poorly heated holiday cottage. This effect is no coincidence, nor does it necessarily indicate “poor heating”; it results from several factors that combine particularly strongly in March, from slow-to-warm walls to humid air and troublesome draughts.

Why spring sunshine only pretends it is warm

When the sun finally streams through the windows after a grey winter, the brain naturally expects warmth. Your eyes see summer, while your body feels a fridge. The reason is that the home is still operating in winter mode.

Thermal inertia: when the building fabric is still stuck in winter

Buildings respond very slowly to changes in temperature. Specialists refer to this as thermal inertia. During winter, walls, ceilings and floors cool down over many weeks. Concrete, brick, screed and tiles store cold much like a battery – only at low temperatures.

“Even if the air outside is already milder, the solid parts of the building still release cold into rooms in March and slow down any warming.”

Even if the heating has already been turned down or switched off entirely during the day, the house’s “cold bottle” effect remains active. Indoor air may briefly warm up, for example when sunlight falls directly through a window. However, cold surfaces take that heat away again. It is especially noticeable when you:

• run your hand across an external wall – it feels cool;
• walk barefoot over tiles – they feel freezing cold;
• sit near a window – coolness radiates from the wall.

The body interprets this as “it is cold in here”, even when the thermometer reads 20 degrees.

Spring sunshine: bright, but still not particularly powerful

In March, the sun is more visible, but it remains relatively low in the sky. Its radiant output is nowhere near that of a July afternoon. The light is intense, but the energy behind it is comparatively limited.

As a result, the sun warms individual surfaces – the windowsill, sofa or table – rather than the mass of the building. Its energy is insufficient to heat through walls that have sat at 10 to 12 degrees for weeks. This creates an optical illusion: it looks like summer, but climatically it is still late winter with attractive lighting.

Invisible cold factors: humidity and draughts

The second major group of influences cannot be seen; they can only be felt. Two in particular have a strong impact on whether a room feels warm or cold: humidity and moving air.

High humidity makes every room feel colder

After a wet, often rainy winter, there is plenty of moisture in the home: in textiles, masonry and the air. Especially during the shift into spring, humidity in many homes is well above the ideal range of 40 to 60 per cent.

“Humid air draws more heat from the body – it intensifies the feeling of cold in much the same way as wind outdoors.”

The effect resembles wearing a wet T-shirt in the shade: the actual air temperature may not be especially low, but you quickly feel thoroughly chilled. Excessive humidity in living spaces can lead to:

• cold feet and constant shivering;
• condensation on windows in the morning;
• a musty smell in certain rooms;
• an increased risk of mould on cold external walls.

So, if you feel cold at home in March while also seeing droplets of water on the window frame, the issue is not only temperature – it is primarily a moisture problem.

Draughts: tiny gaps, major impact

The third factor is air movement. Even very small leaks around windows, doors, sockets in external walls or, in older buildings, radiator recesses can create a measurable airflow. It is often noticeable only as a slight draught, particularly:

• on the sofa beside the patio door;
• at a desk close to a window;
• at floor level along an external wall.

These barely perceptible air movements have a powerful effect: they strip away the thin layer of warm air surrounding the body. Normally, this layer acts like miniature insulation. If cooler air constantly replaces it, you feel cold despite an acceptable room temperature.

“A narrow gap at the patio door can be enough to ruin the feeling of warmth throughout the living room.”

What you can do to escape the March cold trap

The good news is that there is no need to turn the heating straight back up to full. A few targeted measures can noticeably reduce the effect and gradually make the home feel ready for spring.

Ventilate properly: remove moisture while retaining heat

Short, intensive airing is far more effective than leaving windows permanently tilted open. Ideally, open windows wide for five to ten minutes two to three times a day, preferably:

• in the morning, once it has become a little warmer outside;
• after showering or cooking;
• when drying laundry indoors.

This lowers humidity without allowing walls and floors to cool down completely. Frequently ventilating with windows on the tilt setting does the opposite: it creates cold surfaces, damp corners and continual shivering.

Use solar warmth – but manage it intelligently

Sunlight can be used deliberately as free heating. A few straightforward rules can make a considerable difference:

• Open curtains and blinds at sun-facing windows during the day.
• Do not place furniture directly in front of these windows, so that light can reach the floor and walls.
• Once the sun has gone or it becomes dark, close blinds and draw curtains – this slows heat loss significantly.

Modern heavy curtains or thermal blinds in particular can greatly reduce the perceived cold near windows. Sitting at the dining table or on the window seat suddenly becomes much more comfortable.

Take the chill off floors and walls: small measures, substantial effect

Cold feet are among the strongest triggers for feeling chilly. Even one extra textile layer can help:

• rugs or runners on cold tiles and laminate flooring;
• moving seating slightly away from an external wall;
• using cushions, throws and textile covers generously.

It may sound basic, but there is a sound physical reason for it: the fewer body surfaces that have a direct “line of sight” to cold building components, the less heat they radiate away. The perceived temperature rises.

Find and seal draughts

Anyone seriously trying to tackle the March cold in their home should set aside an afternoon to identify leaks. A simple test involves:

• holding a tealight, incense stick or damp hand in front of window and door seals;
• checking whether the flame flickers or the smoke trail moves;
• marking problem areas and sealing them later.

Self-adhesive sealing strips, threshold seals or foam draught excluders placed in front of door gaps are often enough. In rented homes, it is especially worth checking:

• patio doors;
• old wooden windows;
• communal entrance doors in the stairwell.

“Sealing just one draughty window can raise the perceived room temperature by one to two degrees – without any additional heating.”

When technology helps: hygrometers, thermostats and dehumidifiers

Anyone wanting a clearer picture of the situation should get a small hygrometer for the home. These devices cost only a few pounds, yet show very clearly whether humidity is within the healthy range. Readings consistently above 60 per cent indicate a moisture issue for which regular short airing is often not enough.

An electric dehumidifier may be worthwhile in heavily affected rooms – such as poorly insulated ground-floor flats or bedrooms on north-facing elevations. As humidity falls, indoor air becomes noticeably more pleasant and you feel less cold.

It is also worth checking the heating controls: maintaining a modest base temperature of 18 to 19 degrees in infrequently used rooms prevents walls from cooling down completely. Over time, this saves energy because the heating system does not need to compensate for huge temperature differences during the transitional season.

How to assess your own comfort more accurately

Many people rely solely on the reading shown by the thermostat. It is wiser to consider several factors together:

• air temperature (thermometer);
• surface temperature of walls and floors (hand test);
• humidity (hygrometer);
• awareness of draughts (can you feel air pulling anywhere?);
• what you are wearing (a T-shirt or a thick jumper?).

Taking all of these into account quickly explains why 20 degrees can sometimes feel cosy and sometimes icy. This observation is particularly worthwhile in March, because it determines whether the home feels like a cold store throughout spring – or gradually becomes a pleasant, dry and comfortable place.