david wrote:
Is there a programmable thermostat (for furnace) that allows the hysteresis
to be changed from the front panel, using keys and display?

E.g. turn on at 65 degree and turn off at 66 degree

Or, maintain temp at 65 with X number of on/off cycle per hour

I have a 10 year old honeywell programmable thermostat. Although the
hysteresis can be changed, it is done with a pair of screws on the back of
the unit, and it is not continuously adjustable, just several predefined
settings to choose from, and is hard to use (I can only guess what the
current setting is since the screws have no indicators).

It worked fine for many years but last year, it started to cycle the furnace
too frequently (felt like every few minutes). Using the screws in the back I
changed to a less frequent setting, but it is too infrequent. There is no
setting in -between.

I need something more flexible and easier to use. Any suggestions?


I just installed a Honeywell RTH7400 in
my motorhome. It really works
great. I was only using it for AC and
Heat Pump. On the last trip, the
Heat Pump was cycling too often so I
checked the manual. They don't
identify it as a cycling setting, but
describe its settings for various types
of heating systems. They only show a
few numbers, however, all numbers
from 1 to 9 affect the cycling. I
adjusted mine to 5 and it seems perfect.