air conditioning units in apartment condos.There are a number of apartment condo buildings around suburban Baltimore usually with gas heat and regular direct expansion cooling units installed thru the wall. These units use refrigerant 22, I believe. I wonder how these units will be replaced when the R22 units are no longer available since the condenser coils on R410A units seem to be considerably larger.December 02 2010 - Baltimore11YesReport a ProblemProblemSelect oneOffensive contentIrrelevant contentSpam (pure self-promotion)OtherDetailsYour emailPlease enter a valid email address.Submit CancelContent flaggedWe will review this content. Thanks for helping make the site more useful to everyone. To learn more, read Zillow's Good Neighbor Policy.We're sorry. This service is temporarily unavailable. Please come back later and try again.