"katrina" wrote in message
oups.com...
At least 4 times wihin the past of couple of years, i had called A/C
maintenance people to take a look at my a/c unit for not giving cool
air. They all found freon level was too low. Filled the freon,
tightened the valve here and there. But few weeks later, the same
problem again. One a/c guy said coil was leaking and gave me an
estimate of $3000 to replace it. i called other a/c guy for his
opinion. He said there was nothing wrong with coil system. Coil is in
my attic. i did notice, attic gets cool when i run the a/c although
there is no a/c vent in attic. then i found out there was cold blow of
air coming from joints around the coil system box. is it normal to get
cool air blowing out from coil system? I taped all those joint
openings. i also hear some hoarse/dry noise coming out of the coil in
the attic that i do not hear from another coil system in the first
floor (we have two a/c system, one for each floor). Eveytime a/c guys
show up they fill up the freon, clean the shrubs around compressor,
tightens the valves, but the problem does not go away. i wanted to put
this problem here before calling a/c guy for the fifth time. what
should i ask him? why they can not fix the leak which is the obvious
problem? How do i find out the leak and fix it?

That time frame looks like atleast once a year. The AC man should be
finding the leak. He should have a device usually called a sniffer. It is
a handheld device to check for leaks and he should be able to use it to find
the leak and fix it. Often when you are low on the freon the cooling coil
will become very cold and have ice on it. This seems like the opposit of
what you would think, but that is the way it is. Then the air flow gets
blocked with ice and no cool air can get through the unit. While not likely
it may be a dirty air filter. Friend of mine had a problem with the air
flow in his house. He had an electronic air filter and when it was
installed they forgot to remove the regular filter. Over teh years it
clogged up and cut off the air flow. He found that and removed the filter
like it should have been and all was fine.