I've heard people say that hoses can leach chemicals into the water. I only ever use the hose whenever I'm filling up an empty tank. Besides, after I cycle it and do a huge water change to get the fish in, most of the original hose water is gone. You could always spend some money on a safe hose. If it says "potable" or "drinking water safe," it's good.
if it is colder, I would degass the water by aerating it upon entry to the tank though, don't just put end of hose under surface of tank water. Lift it up to stir up bubbles.
If it's the same, then have at it.
Been doing it for years, even with discus. No issues. I also do it in the winter when the water temp from the hose is COLD. Again no issues. My fish actually seem to prefer the cold water break and swim around under the nozzel. Even with 30% water changes the overall temp in the tank does not change much and will heat back up to normal temp in an hour or so.