No.
No
Is r-22 Freon compatible with r-134a freon?
Not unless you like the idea of destroying your AC system.
Your AC won't work any better than it did before. Two very different refrigerants, which will not blend, with different superheat points and system pressures. Not to mention that R22 won't carry PAG oil through the system as effectively as 134a, meaning you could end up starving your compressor of lubricating oil, thus burning it out.
ef22a is a refrigerant. It is used in place of R22. It is a Hydrocabon refrigerant. Very efficient.....
No. the pressure are different, r22 runs at a fairly low pressure and you shouldn't be worried about blowing your gauges, but you won't be able to determine your super-heat or sub-cooling. for a about $100cdn you can buy the right gauges.
r22
R-421A is an R22 alternative refrigerant. It is licensed under the Choice brand name ( Choice R-421A). It is a blend of 58%/42% R-125 and R-134a. It is a non-ozone depleting refrigerant, and the only 2-component refrigerant blend to replace R22. For more information, visit www.rmsgas.com.
No, R22 is for refrigerators and home AC. It runs at a different pressure and you can't use one for the other.
Hfc-134a is the refrigerant used in moble air conditioning systems (MVAC).
Most new equipment is built for and charged with R410a, a refrigerant with much higher pressures than the R22 used for decades, R22 units are still available, dry charged however, you must fill them with R22 onsite. This is how new R22 compatible equipments being sold still.