Are there any thermostats (any type) that are smart enough not to
turn on the heat at 10:55 when they are programmed to set back at
11:00? It seems wasteful and hard on the equipment to do so.
Also for heat pump thermostats, are there any out there that will
not activate stage 2 (electric aux heat) during normal setback
recovery. If it is 45 degrees outside, I don't want the aux heat
immediately coming on every morning just because the thermostat
is set to warm the house to the morning temp setting.
The honeywell touchscreen models are also fully programmable and I
believe will solve problem number 2. Not sure if any solve #1 though.
But, I don't think #1 is that big of deal. If the heat comes on 10
mins before the setback, all that means is the house will have a little
extra heat, so the heat won't need to come back on for a little longer
during the setback. In essence, it means the setback period could
have been 10 mins longer, but that diff is so small it's not going to
amount to anything really.
No it's not, since you don't know when the last cycle will begin. In other
words, if you set the set-back time 10 minutes earlier, that wouldn't
prevent the thermostat from calling for heat one minute before that. What
I'm looking for is either the thermostat not calling for a new heat cycle if
it's within x minutes of the setback time, or keeping the equipment on for a
minimum cycle time, even if that means continuing to operate for a little
while after setback time.
activate stage 2 (electric aux heat) during normal setback recovery. If it is
45 degrees outside, I don't want the aux heat immediately coming on every
morning just because the thermostat is set to warm the house to the morning temp
Fascinating, because that's exactly the model that prompted my
question! The house has one Honeywell 8611g and one Lennox branded
Honeywell thermostat that looks to be the exact same thing. (I'm not
sure if the Lennox branded one has any additional features, doesn't
appear to and the instructions are very basic). In both cases a normal
setback recovery causes the AUX heat to come on, which consumes a lot of
energy unnecessarily (and also ramps up the fan to the noisy high
For question #2 (the heat pump question) the thermostat in place IS a
Honeywell, specifically model # 8611. Another unit in the same house has
a similar thermostat except that it is branded as Lennox. In either case
when the morning/evening recovery time begins, the Stage 2 (Aux electric
heat) comes on too, which sharply increases operating costs
unnecessarily. Perhaps Honeywell should be added to the cheapo stuff
list? I believe the 8611 cost well over 100, they were installed by the
contractor when the HP units (the whole business) were replaced.
White-Rodgers. It can turn on or off this feature. Also it can turn on
fan full time during certain periods. In summer I leave my fan on all
night, but not during day. raises humidity in house, but it costs less.
"Then said I, Wisdom [is] better than strength: nevertheless the poor
I have a Honeywell CT3611R that I use with my heat pump. It has "Smart
Response Technology" that turns the heat pump on early so that it
gradually reaches the target temperature by the time you program
without using the strip heater. It has been a huge savings for me.
You can see one at:
I'm sure you can search and find one cheaper also. I have to say that
I bought mine on E-bay for around $22. It was new in the package and
has worked great for 2 years now.
I'll look into that model. I once used the single stage CT3600 (same series I
a gas boiler operation. One thing I liked about it was that it kept a daily and
resetable log of the time the system operates. The Honeywell 8611 has the
technology" too, but it doesn't seem smart in my case.
I think you missing the problem as that doesn't solve anything.
Regardless of what the time the change is set he is trying to find a stat
that is smart enough to avoid a 2 or 3 minute truncated "on" cycle at the
end of a program period by anticipating the pending change.
Using made up numbers, the stat would only come on if it could get a full
10 minute or longer "on" cycle, So while the program setting changes at
11:00, the latest the unit would come on would be 10: 50. If the unit was
already running at 10:50 it would continue to run as long a necesary up to
11:00. If the unit was off at 10:50 it would anticipate the 11:00 change
and would not start an "on" cycle..
My thermostat (a RCS remote-controllable unit) avoids short cycles,
but in a slightly different way. It just does not turn off the heat
until a minimum time has expired. This may cause it to run a little
past the setback time. It also assures the minimum off-time for an AC
That's great, but that's not what I'm looking for, since a call for heat at
10:54 is the exact same scenario in your case. The exact time of the
setback isn't important, prevening an unnecessary short cycle by turning on
just before setback time is.
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