a thread i found at hcp from emong3:

Summer na naman at mukhang painit ng painit ang summer sa Manila... Every year mas mainit keysa previous.

Here's a simple project you can do to your Aircon to make it a little more efficient.

Materials needed:
1. Spray bottle (yung pang wisik ng tubig sa mga barbero)
2. Windshield washer hose
3. Zip Ties
4. Epoxy steel

Procedure:
1. Cut the nozzle of the spray bottle using a hack saw. ghetto rig the hose so it will connect to the nozzle. use epoxy para matibay.
2. Position the Nozzle on front of the Condenser and secure it using zip ties.
3. Un plug the windshield washer hose from the pump, and connect the hose from the nozzle.

Principle behind this:
During hot weather, the ambient temperature is so high, the heat transfer in the condenser becomes less efficient. Spraying a mist on the condenser improves the transfer of heat from the condenser to the air. Heat is required to evaporate the water thus heat transfer is improved.
Di naman nag uuulan pag summer kaya bihira lang gamitin ang windshield washer. During hot days and you are stuck in traffic spray a mist of water on the condenser para lumamig siya and you will notice lalamig din ang aircon mo at mas maganda ang idling ng kotse...

HTH