Al Bundy wrote:
"clickclack" wrote in
ups.com:

I'm new to owning a home. Someone told me that I have to run my oil
forced air furnace once a month in the summer to keep the furnace from
rusting. Is this true? I have a hard time accepting this as I'm trying
to cool the house off..why turn up the heat?


Never heard of that.

Closest thing to that was running the car AC every 2-4 weeks in winter to
keep the seals lubed so they don't dry out. How true is that? Dunno for a
fact. Maybe another old wives tale.



It might have been true when A/Cs first came out,
but later it didn't make any difference. The
point is moot anymore because most modern vehicles
run the A/C automatically under many heat
settings, most common is the A/C running whenever
the defrost is turned on. My pickup has about 8
settings and it runs the A/C with all but 3 settings.