Must be a big house, having four HVAC systems. I've seen
two, but not four. I'd want the HVAC guy to pull the furnace
burners out, and look for cracked heat exchangers. Since
they are modern, most like 90 percenters. Might not be
practical to pull the burners like we did in the eighties,
on the 70 percenters.
Try both the heat, and the AC. Maybe in that order. Warm the
place up, and then cool it down. Look for cracked heat
exchangers. And see if the AC runs with a reasonable amp
draw. Check some temperatures, and see if the out door units
As to the filters near the machine, that does sound
practical. Would mean one last trip up the ladder, to pull
the filters out of the existing unit. Of course, the tech on
the scene would be best able to see how practical this is.
Christopher A. Young
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