Back in college, we were taught about basic principles in designing our structures using different passive cooling methods. But what I’d like to share are those that apply most to structures here in the Philippines.
If you are still planning your spaces, try to position the bedrooms in a way that it faces the east side where the sun rises. You must avoid placing your bedrooms on the west side of the structure because the afternoon sun is too hot and will likely build up more heat as the sun sets.
If you already have an existing structure and there is no other way to relocate your rooms, do not fret though, since there are other ways to resolve the cooling problem within these spaces. You can alternatively use sun shields or solar shields as they call it, to block off the unwanted light and heat in your rooms. You can either use window blinds or roller shades to deal with the scorching heat and unwanted glare. Other solutions may include the installation of a canopy to put up a shade at the exterior surface of your structure just like what I did with my apartment. (I also used window blinds to heighten the effect.)
Using mechanical means of cooling living spaces can also be used but I do recommend lessening the use of this method not only because it uses a lot of energy (which thereby increases heat) to run these machines but also having them around may increase your monthly electric bill. If you want to use air conditioning systems, make use of the latest technology available and hire a professional that can compute for the actual cooling requirement so you can buy the right equipment for your spaces and get the most out of it.
Advance options includes: the strategic placing of plants, shrubs or trees that may help redirect light, create a shade and filter out pollutants that may enter your structure. The provision of wall barriers to create an air space between two walls can be effective in creating a cooler environment. Inclusion of water tight walls can also achieve the same effect.
Proper venting and air flow also helps in creating a cool living space. You can increase the height of your rooms (floor-to-ceiling height) so that air may flow freely within the room. Air vents can be installed on ceilings to let air pass through. Always remember that cold air remains on the ground while hot air always rises up. With this concept, you can find solutions in getting rid of unwanted air.
In a nut shell, what you need is to avoid unwanted light or glare, create a good shade and provide more than enough air space.