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Our experience with house air has not been good and our building is only 10 
years old.  We have outages about once every 2 months.  Outages last 1-2 days 
and require constant calls to University maintenance to ensure we are a 
"priority repair".  Several times we have had water show up in the building air 
lines so have a good trap to protect your table.    So.... obviously depends on 
the quality of your building maintenance.  If they regularly clean the filter and 
drain the tank it is likely to be very reliable for years.   
cheers,
m