Energy bills are beginning to climb as the temperature warms heading into summer, with air-conditioners and fans starting to get a solid work out.

But according to the Alternative Technology Association (ATA), well-designed homes can make a huge difference in energy saving and comfort in hot weather.

"Simple design solutions can save hundreds of dollars over summer," says Verity Campbell, editor of the ATA's Sanctuary: modern green homes magazine.

The ATA is Australia's leading not-for-profit, consumer-based organization promoting sustainable home design, renewable energy and water saving.

"If you're renovating or building, you can design to encourage cooling breezes through the home with the simple use of high and low level vents and windows," Ms Campbell says.

"As the hot air escapes through high windows, cooler air is drawn in through low level vents or windows. It's simple design principles like this that make a difference."

Ms Campbell says people who are not renovating or building can still make a big difference to the liveability of their homes in hot conditions. Importantly, people should keep their blinds down and windows closed during the day. At night, windows need to be opened to let air move through.

"Keeping heat out before it reaches windows is essential. Fitting external blinds on west-facing windows, in particular, will make a huge difference. Green walls, which can be as simple as a trellis and vine, help keep outside walls cool."

Green ways to keep your home cool:

• blinds down and windows closed during the day, up and open at night
• high and low vents
• eaves above windows
• green walls, such as a trellis and vine
• external shades and blinds