My new laptop does the same thing. It blows out cold air, it means that it's not using a lot of power for the battery to get hot enough to blow out cold air. Could also mean your laptop vents are really clean and clear now!
first time posting here thought i would try it though. last week i took of the bottom of my laptop to clean out the vents and the fan. Now BEFORE i had cleaned it, the bottom was getting hot as usual with laptops, and ALL the vents were letting out hot air, as its supposed to do..... But now after i had cleaned it, the vent that is below (or above it depending how you look at it) the fan is spitting out COLD air which i dont think it ever has done before. my laptop is a fujitsu ah530. it is almost 2 years old, but as long as i can remember no COLD air came out of ANY vents, and the whole bottom was always warm,hot. now the part around the fan/vent is cold, while the rest of the bottom is hot as usual. My main questions/concerns here were whether some how could i have made the fan go backwards directions now by accident, i didnt change or do anything other than wipe the blades with a qtip to get the dust out and blow air (From me lol not a can of compressed air) at it and wipe the vents clean. Also, the laptop doesnt seem to be overheating or anything it usually operates around 65-79 degree's Celsius like always. My whole thinking and worry is if this cold air is coming out the bottom vent, its NOT going upwards towards the motherboard, thus not cooling the laptop as much as it should. does anyone else have a laptop where cold air comes out it at all? like i said before, there was never cold air coming out, only hot air... sorry for the long post jus wanted to put the whole story up. thank you for any comments and tips/answers to this. good day.