Shade Your Windows especially the windows who are exposed to direct sunlight
Using internal blinds and drapes can block up to 65% of the heat that would otherwise come in through your windows. External shade screenscan block up to 95% of the heat. The more glass your home has – especially on the east and  west sides – the more important window shading is to enhance your comfort and reduce the energy bill.
Find window coverings that you like and you will use them often.

Window coverings will regulate your home’s temperature and reduce your energy bill year-round. As well as keeping your space cooler in the summer, internal shading devices will also work to keep it warmer in winter.

Health & comfort
Naturally regulated indoor temperature is more comfortable and healthier to live in, than mechanically cooled air.  Hot summer nights will make you feel uncomfortable and change your sleeping patterns.

Draft proofing does not require a lot of materials, which makes it a relatively low-impact way to conserve energy. That benefits you and the planet

Weather-stripping

• Ensure weatherstripping is removable as it might need to be replaced or adjusted over time.
• V-shaped weather stripping works well on doors as it makes good contact even as the door warps in different seasons.
• Weather strips come in metal, rubber, foam and vinyl. All kinds can be effective provided they are fitted correctly . Find one that is durable, replaceable and can be adjusted to the shape of the door or window as it warps.
• Self-stick foam and rolled rubber are relatively easy to install.
• Buy something that you feel comfortable installing.

Minimize indoor heat generation during the summer

• A house heats up from solar heat gain through the roof and windows, as well as activities inside the house that generate heat. Cooking is often the biggest contributor to indoor heat but electronic equipment and other home appliances also play a part in heating the air. Managing the use of appliances and electronic equipment can help minimize indoor heat generation and reduce the need for energy use by cooling equipment.
• Keep the sunlight and the hot air out
• Close up your home before the day heats up and do not open the doors or windows until the outside temperature is cooler than inside the home.
• If you feel like you need to create a breeze open all the internal doors and perhaps use a small fan.

Minimize the loss of the indoor heat during the winter

• Keep the outside doors & windows closed in cold weather.
• Leave inside doors open to let the hot air to flow through the other rooms.
• If the sunlight reaches your windows open the curtains to let the sun warm the room with the windows closed.  When the sun light goes off the window, close the curtains to help keep the heat in.