I was worried to do this due to the water temp coming straight from the hose. I do live in San Diego county so it's not like the water coming out too cold, I just don't want the temp to drop too much. I have been thinking about picking up a cheap pond pump or powerhead and a few 55 gallon barrels. That way I could fill the barrels with the hose, heat and treat the water then just pump it into the tank.
when i do a 90% water change in my tank, the temp drops from 80 to 74. then it's back up to 80 again the next day. i don't think a 6 degree drop will affect the fish much.