I own a Honeywell Vision Pro thermostat. This thermostat has a built in
timer with date. With the change in daylight savings time this year. Spring
being moved up a couple of weeks & fall is being pushed back a couple of
weeks. How can I program it for the new format the government implemented?
Thank you Steven
It looks as though daylight savings time will be longer, but that
ceratinly will not affect when Spring and Fall will be. The seasons
are based on the orbit of Earth around the Sun.
You may have to contact the company to see how to deal with the change
in daylight savings time. Hopefully someone here will know how to re-
program the unit to accept the new dates. Good Luck.
As others have pointed out, you probably can't.
But I'm wondering -- what difference does it make? Both transitions occur at a
time of year when you don't need to use your furnace *or* your air conditioner
a whole lot. Is one hour plus or minus on your setback times really going to
make that much difference in your comfort, for the few weeks that it will be
out of sync?
Doug Miller (alphageek at milmac dot com)
It probably had eprom or plain rom chip in which case it cant be
reprogrammed, and who ever said its spring or fall and you shouldn't be
using furnace much, I guess it would depend on his location, norther
minnisotta I bet he will still be using it a lot. Im still wondering if I
will be able to get an update to my old computer bios's for new dates for
automatic savings time updates. Or if its handled by windows itself.
Certainly it depends on location. You're right that in early April, if
he lives in northern Minnesota, he'd still be using the furnace a lot.
But if he lives in southern Georgia, he wouldn't be using it at all.
Point is that when the DST transitions occur, the furnace is not going
to be used enough that one hour difference on the timing of the setback
periods is really going to matter much for most people.
To the OP -- if that's not acceptable to you, put your old t-stat on
eBay. I'll buy it.
Most recent versions of Windows allow you the option of synchronizing
your PC's clock to an internet time server. Do that, and the DST
transitions will be handled for you automagically.
For example, in XP, double-click on the time in the lower right hand
corner. "Date and Time Properties" box appears. Click the "Internet
Time" tab, then check the box next to "Automatically synchronize with an
internet time server". Then click OK.
Sorry, no "automagic" DST transitions from the time servers. Internet
time servers running the NTP protocol (the protocol used by that
"Internet Time" tab) use UTC, leaving local translations for time zone
and DST up to the local client system. As you're running Windows, you'll
find these translations in your Control Panel, under "Date/Time" (aka,
"Date and Time").
What makes the difference is that if the thermostat thinks it's 7AM when it's
really 6AM, the timing of the setback periods will be off by an hour. The OP
wants to avoid having to reprogram his thermostat twice each spring, and twice
each fall, to account for the thermostat not making the DST transition at the
same time all of his clocks do.
Doug Miller (alphageek at milmac dot com)
Let's suppose someone has their heat pre-programmed to 70 deg in the
evening, 65 overnight, and 70 again by the time they get out of bed, say at
7:00 AM. On March 11, they forward their clock so that when it reads 7:00
AM, the thermostat still thinks it's only 6:00 AM, and the temperature is
colder than 70 deg, which defeats the whole purpose of having a digital
programmable thermostat with discrete time/temperature pre-programmed
The whole point of having a clock on a digital programmable thermostat is to
take advantage of setting the temperature to different values at specific
times of the day.
It takes 30 seconds to disable the auto DST adjustment feature, and perhaps
10 seconds, maximum, to manually adjust the time after that, two times per
Nobody should ever have to reprogram the thermostat! At worse,
just turn off automatic DST adjustment entirely and manually adjust the
clock on the thermostat at the same time as resetting all the other
clocks in the house. Changing the clock time by an hour is generally
easier than changing thermostat programming, and needs to be done at
most twice a year.
Now, the change in DST dates will break the existing automatic DST
compensation, and it would be nice if there was a firmware update to fix
that, but that's not likely for a cheap device like a programmable
thermostat. And how important is the feature, really?
I was going to say that, but I guess he wants the house to get hotter
at the last minute, just before he gets up for work, and unless one is
a farmer, work seems to be dependant on the clock, not the sun.
I guess I just don't see why it's better to jump through
hoops the change the thermostat's DST adjustment than to jump
through nearly identical hoops to change the time the furnace
comes on in the morning.
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