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Old 11-26-2012, 05:36 PM   #16
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Programable thermostat


Build a chase. unless its in the middle of the ceiling.

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Old 11-26-2012, 06:33 PM   #17
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Programable thermostat


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Originally Posted by digitalplumber View Post
Mine is not heat pump but gas. I found that setting it back anymore than 2 maybe 4 degrees during winter day or night, required too long of a recovery.

So I tested it by knowing the 4 degree setback costs, then setback less and my house was more comfortable and cost less.

Thanks
What is 'too long' of a recovery? Just set the time back a little so it starts earlier. You don't use more gas, it's just BTUs you are putting into the house and you basically pay per BTU. When you lower the temperature difference between inside/outside, you lose fewer BTUs so the longer you keep the house colder, the more you save.

Here's a graph showing our house dropping down to 62F during the day and during the night and you can see the recovery takes longer when it's cold, so more BTUs but we save a ton by it not running as often.



I've run the numbers, it really does save to let it go colder.
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Old 11-26-2012, 06:36 PM   #18
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Programable thermostat


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Cost aside, do you think the Nest provides any extra value or energy efficiency over the other Wifi/programmable thermostats? "Learning" is a pretty cool feature, and it's design is sexy, but I'm also nerdy enough to come up with my own schedule.
If you actually program a thermostat to reflect your schedule, then the Nest won't be able to save much more, but for most people I'd say it will help because most people don't actually program their thermostats.

However, a good percentage of people are buying the Nest because it's cool looking, being marketed heavily compared to others, and because they think it's the first thermostat ever to be internet-enabled. Oh, it's sold in the Apple store also...
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Old 11-26-2012, 07:31 PM   #19
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Programable thermostat


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Originally Posted by SuperJETT

What is 'too long' of a recovery? Just set the time back a little so it starts earlier. You don't use more gas, it's just BTUs you are putting into the house and you basically pay per BTU. When you lower the temperature difference between inside/outside, you lose fewer BTUs so the longer you keep the house colder, the more you save.

Here's a graph showing our house dropping down to 62F during the day and during the night and you can see the recovery takes longer when it's cold, so more BTUs but we save a ton by it not running as often.

I've run the numbers, it really does save to let it go colder.
Mine would never do that recovery. I can set back to 66 and have it go to 70 starting at 445am and it won't be there at 7.

My old home, I use to turn it off. Come home and 1 hr later nice and comfy! Same in morning.

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