How to keep your new build home cool in Summer

Developers have designed to be comfortable, sustainable and cheaper to run than many older properties. To help lower your energy bills, new homes can feature solar panels, advanced insulation and triple glazed windows.

Whilst new builds keep you toasty in winter, they can hold heat during summer heatwaves. The good news is that there are plenty of simple ways to stay comfortable without using lots of extra energy.

Here are a few easy tips to help you keep your new build home cool throughout the summer.

Make the most of your home's design

One of the biggest advantages of living in a new home is that builders follow modern standards. Advanced insulation and triple glazing do more than save energy in winter. They keep your home’s temperature stable all year.

During the summer, your home can often stay cooler than outside temperatures. This is especially if you stop hot air from getting in during the hottest part of the day.

Don't think of your home as trapping heat, think of it as holding onto whatever temperature is already inside. If you can keep it cool during the morning, it’s much easier to maintain that comfortable temperature throughout the day.

Keep the heat outside

When temperatures soar, the natural response is to open all the windows. But, if it's hotter outside than inside your home, you will be letting more heat in than out.

Keep windows and external doors closed during the hottest hours of the day. Windows that receive direct sunlight, close blinds or curtains to reduce the amount of heat entering your home.

When the sun starts setting and temperatures start falling, open your windows to let the cooler evening air circulate. Opening windows on opposite side of your home can create a natural through breeze. Helping to replace warm air with cooler air from outside.

Let your garden do some of the work

Climbing plants grown up south-facing walls can provide natural shade. Reducing the amount of sunlight reaching the brickwork.

The key is to plant early! Climbers can take years to establish. Plants will continue to provide shade year after year whilst also supporting wildlife.

If you have the space, trees and larger shrubs can also create welcome shade.

Be mindful of heat indoors

Everyday activities can add to the heat within your new home. Cooking, running the tumble dryer and leaving electrical appliances can all influence indoor temperatures.

On warmer days, prepare lighter meals and use a barbecue. Save chores like laundry for later evening, when temperatures fall. These small changes, like switching off appliances you're not using and choosing LED lighting can help reduce unnecessary heat.

Consider air conditioning

As summers become warmer, some homeowners are choosing to install air conditioning.

Before investing in an air conditioning unit, try a fan. Whilst they do not actively cool the air, they do create airflow. Fans are inexpensive to run and a quick way to cool down your home.

For those looking for more consistent cooling, air conditioning is something to consider. Modern systems are more energy efficient than people think. Alongside adequate ventilation and shading, they can keep your home icy cold during summer months.

If your new build has solar panels, you may use the electricity to help power the units.

When installing air con, it is important to check with your builder if there are any restrictions and regulations.

Features that keep your new build home cool in summer

What developers do:

• Install advanced insulation to walls, roof and floor.
• Fit energy efficient double or triple glazing to reduce heat transfer.
• Airtight construction.
• Mechanical ventilation with heat recovery (MVHR).
• Design homes with good natural ventilation.
• Incorporate shading features, such as rood overhands or recessed windows.
• Offer energy efficient heating. Some air source heat pumps allow for heating and cooling.
• Fit solar PV panels - make the most of the sunny weather!

What homeowners can do:

• Keep windows and external doors closed during hottest hours of the day.
• Open windows in the evening to let cooler air circulate.
• Close blinds and curtains on windows in direct sunlight.
• Create a through breeze by opening windows on opposite sides of the house.
• Avoid generating additional heat. Limit oven use, switch off appliances and use LED lighting.
• Plant climbing plants on south-facing external walls and add trees or shrubs to create natural shade over time.
• Try fans before installing air conditioning.

In conclusion

Keeping your new build home cool in summer doesn’t have to mean sacrificing comfort or running air conditioning all day.

New build homes are designed to be energy efficient all year round. Working with your home’s features rather than against them, you can make the most of that design.

Simple habits can make a noticeable difference. Keep the heat out during the day. Use cooler evenings to your advantage and add natural shade when you can.

And if you decide to install air conditioning, choose an energy-efficient system. Use it with these practical measures and this will keep your home cool and your energy bills manageable all summer.

Disclaimer

newhomesforsale.co.uk is a property portal and not a financial advisor, mortgage broker or mortgage lender. Always seek independent financial advice before making significant decisions about your money, mortgages or purchasing a property.

All information included in our articles is accurate to the best of our knowledge at the time of publication. However, any references to dates, prices and availability are subject to change without notice.

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Publish date 15th July, 2026
Reading time: 4 minutes
Written by Heather Bowles

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