That would depend on how he wired it.

If he connected the single stage stat correctly, the furnace operates on 1st stage for a preset time (usually around 6-8 minutes). If the stat is not satisfied in that time period, it will go to 2nd stage and satisfy call for heat.

If he jumped both stages together (w1&w2) the furnace will always go right to full fire. depending on vintage of furnace, there was some differences in jumpers/switches but this is the genearl answer.

I feel you are not receiving full advantages of your furnace in both heat and AC and you should get a 2 stage heat/cool stat.

Pretty sad crippling such a nice furnace with a single stage stat. The idea of 2 stage is long run cycles on gentle low in bitter weather. Can't have that with a timer going to high after 16 minutes or less.

Driving somewhere on a bitter morning, do you turn your heater WARMER as the car warms up? Of course not. So why do you want your furnace to crank up just as the house warms up. If you can't budget the Infinity control, at least go to a 2 stage conventional stat. You'll like the improvement.

Mikenew... Welcome.

As long as you are advertising here, which is frowned upon in these forums, you should change your website advocating self-repair HVAC for homeowners. It still says: "Total Cost to be your own AC Repairman (Only until Sept. 14th, 2007) : $79.97"

It's 2/4/2008 now. Also, you should sell insurance for electrocuted homeowners with that book, too.

Thanks for the help. I double checked my old thermostat and it's a single stage as well (same brand, White Rodgers). This is the only kind my installer uses. So it's probably just running the same as before but I am more aware of it. It just seems to be cycling an awful lot. He also serviced the furnace when he was here so it may be related to that. Or I may just be crazy. :-)

I think I may just spring for the Infinity Control. At least I haven't paid the bill yet.

You can set the dip switches on the circuit board so that when a single stage thermostat is used the furnace will run on low fire for 6 to 8 minutes, then the board on furnace will automatically kick it into high fire, check the dip switches.