The Landlord gas safety inspection is a safety check of all the gas appliances within a property that is classed as rented. Once an inspection is carried out the gas safe engineer carrying out the inspection will issue a certificate with his findings. At the end of 2014, R-22 refrigerant will be banned under EU legislation. So air conditioner systems with R-22 gas will effectively become redundant as any loss of gas cannot be replaced. It is estimated that there are still millions of R-22 systems still in operation, but the main reason for businesses delaying implementation of R-22 replacement systems is, putting it simply, the expense.