No
ef-22a is a hydrocarbon refrigerant that replaces R22
R22 - Can be easily replaced with the hydrocarbon version EF-22a. Made by ecofreeez.
No
sorry, no.
no.
no
No
No
It is not recommended.
Absolutely. No need to change any oils or fitting. Top off or replace. works great. Just remember you need a lot less of it in the system.
No , they operate at different pressures and are not compatible.