If your aircon has just broken down or you are looking to cool an area down. Portable aircon rental is definitely the best solution. With ample cooling capabilities similar to your house aircon(9000btu & 12000btu), all you require is an outlet for the hot air and a normal household plug in order to get going.
We use reputable brands such as Midea. To determine how many units you require, 9000btu is ample for a standard sized HDB/Condominium room. For living rooms, consider getting 2 units to provide ample cooling. for larger rooms such as the old HDB room sizes or landed properties, using the 12000btu will be the best choice.