Should You Keep Your Windows Open When It’s Hot? 

Should You Keep Your Windows Open When It’s Hot? 

When the temperatures rise and issues begin to warmth up indoors, all of us search for some cooling reduction by throwing open our home windows – however is that the most effective factor to do? After all, that’s the place the warmth is coming from, proper?

While opening home windows can present much-needed contemporary air, it could additionally open up our houses to humidity and air pollution and might even be a safety threat. Depending in your location, local weather and time of day, there are totally different steps you must take when it’s sizzling.

We requested the consultants to seek out the most effective cooling resolution within the hotter months. By talking to trade professionals and cool-home fans, we’ve compiled a listing of the most effective recommendation for all sorts of houses and eventualities.

1. Consider your setting

The choice to open or shut home windows in the summertime will depend on numerous elements, together with local weather, temperature, humidity ranges, and private preferences.

For these dwelling in areas with excessive humidity or air pollution, it could be higher to maintain home windows closed and depend on air con to keep up a cushty indoor setting. Opening home windows in sizzling and humid areas can enhance humidity and make houses really feel even hotter.

On the opposite hand, opening home windows in areas with cooler summer time temperatures might help calm down houses and permit contemporary air to flow into. If you reside in a cooler local weather or have a well-insulated house, opening home windows could also be an efficient option to cut back the necessity for air con and enhance indoor air high quality. Opening home windows may also enhance total consolation by making a pure breeze and offering a way of coolness.

Pay consideration to your setting and well being issues to find out the most effective strategy for sustaining a cushty indoor setting in the course of the summer time.

2. Temperature and time of day

Keep Windows Open Time Temperature

The finest option to management the temperature inside your property is by taking motion relying on the time of day. For instance, a basic rule is to depart the home windows closed if the temperature outdoors your property is increased than inside. This will forestall further warmth from getting into your property.

In distinction, the temperatures outdoors will usually be decrease as soon as the solar has gone down (or earlier than it has risen). This is a good time to open your home windows and get some cool air circulating.

Andrew Meyer, co-founder of Swell Energy, recommends the next:

Grab a digital thermometer or obtain an app when unsure to see which is cooler. If the climate outdoors is hotter, then shut your home windows to lure the “cool” air in. On the opposite hand, if the within of your home is hotter, often within the early morning or late night, then open them as much as let a cool breeze in.

3. Humidity ranges

Opening home windows throughout sizzling climate in areas with excessive humidity can elevate moisture ranges inside your property, selling the expansion of mould and mildew. This could make sustaining a clear and comfy indoor setting difficult, significantly for these with allergic reactions or respiratory points.

Corinne Segura, a Green Building Materials marketing consultant, founder and author at My Chemical-Free House, understands the destructive results of opening home windows in humid climate:

Some establishments like Energy Star suggest your relative humidity not go increased than 50%, whereas many different consultants like Mike Holmes suggest an higher restrict of 60%. Above this, the humidity can contribute to indoor mould development (and this might be behind partitions, not essentially seen).

To enhance airflow when the humidity is excessive outdoors, think about putting in an […] air exchanger that modifies the humidity whereas overturning the air.

To forestall these points, preserving home windows closed in humid areas and contemplating investing in a dehumidifier to regulate moisture ranges is beneficial. Regular cleansing and upkeep may also assist forestall mould and mildew development.

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4. Air conditioning and followers

Fan Air Conditioning Keep Windows Open

Using cooling home equipment, corresponding to air conditioners, followers or air to air heating might be an effective way to cut back the temperature in your house. However, you must keep in mind some essential issues in case you use them.

To get probably the most from these home equipment, it’s beneficial that you just preserve home windows shut when they’re working, significantly if the temperature outdoors is hotter than inside. Heat will enter the house if home windows are open, which means your equipment received’t work successfully, however it would nonetheless price you cash on electrical energy payments.

Fans could make a larger distinction throughout cooler instances, corresponding to very first thing within the morning and late within the night when the solar is down. When mixed with open home windows at these instances, you will get a really efficient cooling airflow by means of your property.

5. Energy payments

One of probably the most vital advantages of opening your home windows throughout summer time is lowering vitality consumption. Air conditioning programs, or electrical followers, require lots of vitality, and leaving them working for prolonged intervals may end up in excessive electrical energy payments, so opening home windows as a substitute is usually a cheaper choice.

It is price noting, nevertheless, that in case you select to open home windows and run a cooling equipment concurrently, you’ll use lots of vitality attempting to deal with the warmth that’s persevering with to enter your property.

To steadiness vitality consumption and luxury, it’s finest to maintain your home windows closed in the course of the hottest elements of the day and depend on air con or followers as a substitute.

6. Air high quality: Allergies and air pollution

Opening home windows can permit contemporary air to flow into by means of your property, nevertheless, it’s essential additionally to think about the air high quality in your space. Whether you reside in an city or rural space, there could also be dangerous or irritating pollution within the air round you that you just wish to preserve out of your property.

Joel Comino, founder & CEO of Next Modular, says:

If you reside in an space the place the air high quality is poor, then having your home windows open can introduce pollution into your property. Pollen, mould spores, and different airborne irritants can enter by means of open home windows and trigger discomfort for these with allergic reactions or bronchial asthma.

Allergies Pollen Air Quality Windows Open

Suppose you, or somebody in your house, suffers from allergic reactions or respiratory points. In that case, investing in a high-quality air air purifier might help enhance the indoor air high quality while you retain the home windows closed.

In addition to contemplating air high quality, preserving home windows open may also enhance noise ranges, probably disrupting these working or learning from dwelling.

Noise air pollution is usually a concern, particularly in busy areas or close to noisy streets. If noise is a big subject, preserving home windows closed or utilizing soundproofing strategies could also be vital to keep up a quiet and peaceable indoor setting.

If you resolve to maintain home windows open, it’s essential to usually mud and clear surfaces to forestall the buildup of grime and allergens which will enter by means of the open home windows. This will assist guarantee your indoor setting stays contemporary, wholesome, and comfy.

Read about one of the best ways to wash home windows.

7. Safety and privateness

Safety Security Privacy Open Windows

It may go with out saying, but it surely’s price remembering that open home windows can have an effect on the security and safety of your property.

Ensuring all doorways and home windows are locked securely once you’re not dwelling can cut back the chance of housebreaking or break-ins.

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If you reside on the bottom ground or with a better crime price, taking further precautions, corresponding to putting in window locks or bars to safe your property additional, is essential.

Another consideration is your privateness. While open home windows can permit contemporary air and pure gentle to enter, they could additionally permit passersby or neighbours to see inside your property, making some folks uncomfortable. If privateness is a priority, think about using blinds or curtains to dam the view from the skin.

8. Pests

Pests Ants Wasps Flies Open Windows

When preserving home windows open in the summertime, many individuals fear about bugs getting into their houses. However, putting in protecting screens on home windows and doorways can simply handle this concern.

Screens can successfully block out pests corresponding to flies, mosquitoes, and wasps whereas permitting contemporary air to flow into and funky down your property. Additionally, screens might help preserve out undesirable guests, corresponding to birds and rodents.

Fresh air may also assist preserve pests at bay. By circulating and eradicating stagnant air, pure air flow can create an inhospitable setting for a lot of bugs. Sunlight may also assist discourage pests, as many bugs choose darkish and humid environments.

To minimise the chance of pest issues whereas having fun with the contemporary air, think about using pure repellents corresponding to important oils or citronella candles. These might help discourage pests from getting into your property by means of open home windows. It’s additionally essential to right away clear up any meals or water spills to keep away from attracting undesirable guests into your dwelling house.

9. Ventilation

Proper air flow is important for sustaining a cushty indoor setting, particularly throughout sizzling and humid climate.

One of the simplest methods to realize pure air flow is to open home windows and doorways throughout cooler instances of the day and shut them when it will get hotter. It’s additionally a good suggestion to make use of cross-ventilation by opening home windows on reverse sides of the home, which can assist contemporary air circulate by means of and flow into throughout the house.

One of some great benefits of good air flow is that it could assist forestall condensation and mildew growth. Carl Lewis, proprietor and author at The DIY Fix, highlights the widespread points with dampness and mildew:

According to the English Housing Survey 2019 to 2020, about 14% of houses in England had issues with damp, 50% reported issues with condensation.

A examine performed by the Scottish Government in 2018 discovered that 33% of Scottish households reported experiencing dampness or mould development, 64% reported having issues with condensation.

A report revealed by the Welsh Government in 2017 discovered that 26% of houses in Wales had issues with damp and mildew.

By letting contemporary air flow into in, the present air and any humidity that’s trapped within the air is eliminated. This improves indoor air high quality and creates a extra snug dwelling setting for your self and your loved ones. It additionally reduces the chance of damp, condensation and mildew development.

10. Shading

Blinds Curtains Shading Windows Open

To fight rising temperatures in your house, putting in shading gadgets corresponding to blinds and curtains is essential.

NHS advice recommends preserving sun-facing rooms as shaded as doable by preserving curtains shut, significantly between the hours of 11 am to 4 pm. Heavy material curtains, blinds or reflective window movie can block out the solar’s warmth.

Blackout curtains is usually a helpful addition to retain the shade and additional cut back warmth. They present an additional layer of safety in preserving the warmth out of the room at evening and preserving the room darkish in the course of the day to cease the solar from heating it.

11. Check your home windows and conservatories

Conservatory Windows Open Hot

One of the primary issues to do when getting ready for summer time is to verify your home windows. Double-glazed home windows can present good insulation, but it surely’s essential to verify for any injury or cracks that would compromise their efficiency.

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Additionally, it’s essential to think about your window sort and the way it may be utilised for optimum airflow. Hinged home windows are perfect for open air flow however might be problematic if left open too lengthy and invite pests inside. Sliding home windows are nice for preserving open in the course of the summertime however have to be usually cleaned to forestall monitor blockage. Casement home windows are another choice for pure air flow however may cause an excessive amount of warmth publicity to furnishings.

If you could have a conservatory, it’s beneficial that you just preserve the conservatory home windows open in the course of the day and isolate it from the remainder of the home to cut back warmth switch. For instance, conservatory home windows needs to be saved open throughout a heatwave, and the door between the conservatory and the home needs to be saved closed. This prevents a “greenhouse impact” and causes extraordinarily excessive warmth ranges to be trapped inside.

12. Insulation

Insulation serves as a barrier to forestall the entry of extra warmth from the outside, which might disrupt the indoor temperature and enhance vitality consumption from air con models.

Insulation supplies like fibreglass, cellulose, and foam work by lowering warmth switch by means of conduction, convection, and radiation. By checking that your partitions, roof, and flooring are adequately insulated, you possibly can forestall the buildup of extreme warmth inside your property, resulting in decrease vitality payments and a extra snug dwelling house.

13. Use landscaping

Landscaping Shading Close Windows Open Hot

One efficient option to cut back direct daylight getting into your property is by planting timber and shrubs round your property.

By strategically inserting these pure components, you possibly can create a pure barrier that blocks the solar’s rays and supplies shade.

This is not going to solely cut back the quantity of warmth that enters your property but additionally create a pleasing out of doors house for leisure and recreation. Moreover, timber and shrubs additionally assist purify the air by absorbing carbon dioxide and different pollution and releasing contemporary oxygen, making your setting more healthy and extra satisfying.

However, Be aware earlier than planting that some plant species may cause allergic reactions for these delicate to pollen.

14. Better sleep and wellbeing

Good Sleep Open Window Hot

Opening home windows can present quite a few advantages, together with improved sleep high quality and a connection to nature. Fresh air and a cool breeze assist to chill out the physique, whereas a view of nature can improve total well-being and temper, significantly if dwelling close to water.

In addition, opening home windows can profit indoor crops, serving to them to develop quicker and stronger and bettering indoor air high quality by eradicating stale air and carbon dioxide build-up.

Sunlight and contemporary air may also elevate our moods, resulting in emotions of happiness and lightness.


The choice to maintain home windows open or closed throughout sizzling climate will depend on particular person circumstances, together with location, local weather, private preferences, and tolerance for warmth and noise ranges.

When deciding, it’s essential to be aware of things like air high quality, temperature, and vitality effectivity. For occasion, if out of doors air pollution ranges are excessive, preserving home windows closed and counting on air con could also be finest. However, if out of doors air high quality is nice and humidity ranges are low, opening home windows can tremendously enhance indoor air high quality and save on vitality prices.

By experimenting with totally different window configurations and utilising air flow strategies like followers and cross-breezes, you could find the most effective resolution to your dwelling that promotes a cushty and wholesome dwelling setting.

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