I've got a gas forced air furnace, installed 1998, a cheapo, SEER 10
(12?), I think.
When it was installed, the first year, the blower was set to "low", and
it seemed like i wasn't getting enough flow through the vents on the
second floor (they run in the attic, and blow down).
A new HVAC guy came in the next year to look at it, and switched
(actually I think he jumpered it on a circuit board) to blow "high".
then he went into the attic, and discovered that someone had left one of
the ducts with an OPEN end on it, so I was blowing heat into the attic
instead of into the house. He sealed that duct and left the blower on
now I'm thinking this year that maybe the furnace is short cycling. I
get blower on times of about 7 minutes, and blower off times of about 8
minutes. I can hear the burner is on for about a minute before the
blower comes on, and it's off for another 2 at the end of the cycle, so
I've got flames about 5 of the 7 minutes that the furnace is on.
2 questions in particular:
should I call someone in to reset the fan/blower down to "low" again?
(is this something I could reset myself? I'm smart, I'm handy, I work
on computers for a living...)
How come this furnace, when I set the thermostat to have the fan ON all
the time, will have the fan turn off at the end of the heat cycle and
kick on, then kick off when another heat cycle starts, etc. on and off,
on and off, on and off. Is something not set right? I used to have a
furnace where when I set the fan on, it stayed ON, no matter if it was
heating or not...
I seem to be using a lot more natural gas this year, and since gas costs
are up better than 40% around here, I'd like to see what all I can do
about optimizing the heat cycles.