Yes, absolutely. It is traditionally believed that mommies during confinement are not allowed to be exposed to wind (and as time advanced, the electric fan). This is because the wind carries with it moisture and causes "wind" in the body, and results in Rheumatism.
I do allow mommies to use air-conditioning because air-conditioning is different from a fan or natural breeze, as it is dry. As long as the air-condition isn't directly blowing towards you and is set at a temperature of 25 degrees and above, I really see no harm. Good rest is very important for mommies during confinement, so an appropriate temperature can help mommies sleep comfortably in Singapore's warm and humid weather.