Sudden power loss...

[na01]

As I was waiting for traffic lights today, I wound the windows up and whacked on the air-con than I felt the car lose heaps of power as I took off. I had my foot down on 1st and 2nd gear but there was only slooow acceleration as I was going up bit of a hill. I immediately turned off the air-con but it still felt bit dead after that but I can't be very sure...

I know you use bit of power when the air-con is turned on but the actual loss of power was very noticable. Is this normal? or something wrong with the car? Could todays extremely hot temp have anything to do with it?