Question about Heating & Cooling
Things that are not broken: The big relay that powers the compressor often hums or buzzes when the unit is running. Several brands of heat pumps keep their reversing valve "on" any time the thermostat is set for "cool". They buzz, too.
If something really is loose, the only way to fix it is to look at the machine and take off panels until you find what is buzzing.
Posted on Jul 22, 2008
There is a hissing sound on my Window AC and suddenly the cooling stops.
Posted on Jul 14, 2009
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Posted on Jan 02, 2017
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