The thing you are referring to as the "furnace" is the boiler. It probably
has a Honeywell gray box on the front of it, above the oil burner. In that
box is a high limit aquastat, probably set for 180 degrees. For the summer,
you could try turning that one down to around 125



"Joe" wrote in message
ups.com...
On Jul 8, 10:03 am, "RBM" rbm2(remove wrote:
That is the question. There is definitely a point of diminishing returns.
When you say you lowered to water temperature, was that on the boiler, or
on
the water heater?



I don't believe there is a boiler, just a small water heater. There is
only one option to lower the upper limit on temp.