Rather than do water changes on a regular basis I rely heavily on water quality tests. If the nitrite and ammonia levels start to rise then I will do a partial water change. If the results of the tests warrant it I will do a partial water change every other day till the results show normal. This applies throughout the year. In my opinion if you do not carry out regular water quality checks one of the first indications you will get of anything going wrong is fish dying. If filtering your water don’t forget the time it took to get the balance of good and bad bacteria in your filter right when you first set up the system, so is there not a chance of weakening that balance if you carry out unnecessary water changes. At the end of the day it is really up to the individual, if whatever you do works for you, albeit change water or not, then surely you should carry on as before.
Regards..