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Old 12-21-2015, 09:05 PM   #1
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The old and the new, is digital more efficient???

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I have been considering installing a digital thermostat for sometime. I have had a Honeywell new never used that supports RV use sitting around for months in the packaging. Finally today I got around to installing the new digital thermostat in my class C Tioga. It works wonderfully. I had to get rid of the old analog. It was so inefficient it was causing my furnace to eat through 5 gallons of propane every 2 days. The new thermostat works like a dream. But is digital more energy efficient than the old analog thermostats??? That is my question. I am interested in hearing from anyone who replaced their old thermostat with digital. Is there a difference in propane consumption??? Do you use less propane now??? I still have my old thermostat saved in a shoe box if I ever need to reinstall it. Pictured above is the old and new thermostats. Thanks for your feedback in advance.
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Old 12-21-2015, 10:36 PM   #2
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Yes they are...but the heater is where the efficiency factor is as that is where heat consumed and heat generated matters.

However the digital offers greater control of the heater by responding quicker to actual set temperature rather than the contacts in a by metal strip.

The clock allows you to step down the temp at night to really chilly when you will not notice then warm it up just before yiu get up then cool back a bit.

There are also settings for dwell regarding difference between cut in so it could have longer periods between cycles and maybe longer cycles and these depend on how your system works which is better.
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Old 12-22-2015, 12:19 AM   #3
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A digital t-stat will be more efficient only because it controls operation of furnace or a/c unit better.
Instead of shutting off 3,4,5 degrees above set point or turning on 3,4,5 degrees below set point as with analog t-stat the digital will control within 1 degree of set point.
Therefore furnace or a/c doesn't run as long during each cycle of operation.

How much will it save in 'energy' costs..............couple of bucks

I'm not to concerned with the 'savings'.......I just like it shutting off/turning on when it is suppose to.
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Old 12-22-2015, 07:24 AM   #4
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Originally Posted by Old-Biscuit View Post
A digital t-stat will be more efficient only because it controls operation of furnace or a/c unit better.
Instead of shutting off 3,4,5 degrees above set point or turning on 3,4,5 degrees below set point as with analog t-stat the digital will control within 1 degree of set point.
Therefore furnace or a/c doesn't run as long during each cycle of operation.

How much will it save in 'energy' costs..............couple of bucks

I'm not to concerned with the 'savings'.......I just like it shutting off/turning on when it is suppose to.
The smaller the range or set point the more comfortable you'll be but it's actually less efficient. The more often your furnace cycles on/off the less efficient it is. Each time the furnace goes on you burn a lot of fuel heating up the combustion chamber before you can draw any heat from the unit. You also lose some at shutdown because you can't draw all the residual heat from it after them flame is shut off.

The advantage to a digital thermostat is being able to program them. As mentioned, cooler temps while sleeping or away then step up the temp when it's time to get up or return home. You can do that manually but it's easy to forget or just not bother with it.
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Old 12-22-2015, 07:37 AM   #5
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FWIW In S&B the programmed response makes sense. In the camper we are always setting it by hand because we are not on a regular schedule of need. That negates the programming function thus no point in the digital thermostat.
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Old 12-22-2015, 07:58 AM   #6
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Agree. I installed a Hunter 42999B digital thermostat, available at Walmart for around $20, and it functions much better than the original T'stat our Trek came with.

Quote:
Originally Posted by Old-Biscuit View Post
A digital t-stat will be more efficient only because it controls operation of furnace or a/c unit better.
Instead of shutting off 3,4,5 degrees above set point or turning on 3,4,5 degrees below set point as with analog t-stat the digital will control within 1 degree of set point.
Therefore furnace or a/c doesn't run as long during each cycle of operation.

How much will it save in 'energy' costs..............couple of bucks

I'm not to concerned with the 'savings'.......I just like it shutting off/turning on when it is suppose to.
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Old 12-22-2015, 04:59 PM   #7
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I installed one of the $20 digital thermostats in a 5er we had, replacing an old analog unit. With the old one the temp would swing as much as 5 degrees. With the new digital one it stayed within 1 or 2 degrees! I was amazed!
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Old 12-23-2015, 07:39 AM   #8
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Originally Posted by nothermark View Post
FWIW In S&B the programmed response makes sense. In the camper we are always setting it by hand because we are not on a regular schedule of need. That negates the programming function thus no point in the digital thermostat.
True but as mentioned they hold the temp closer to the set point so you're more comfortable.
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Old 12-23-2015, 09:24 AM   #9
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Question:
Do these household thermostats work on 12 volts DC?
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Old 12-23-2015, 09:44 AM   #10
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Quote:
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Question:
Do these household thermostats work on 12 volts DC?
ChasA
Some do some do not.
I've been using one of these to control my Suberban SF-42F propane furnace since '08.
http://www.amazon.com/gp/product/B00...56PCWYAB6GNKXV
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