Are there possible way to add emissions like HFCs in the model(currently using the old version)? I tried adding default effects but it appears not to work (adding it on residential refrigerator)
Yes - LEAP has a long list of HFCs in its effects list including their global warming potentials. Select: Show <All Effects> to review them,. Also, make sure you put a check next to "Complex Effects" in the Settings : Scope screen if you want these to show up in your calculations.