What's optimal temperature spread for programmable thermostat?

Old 10-17-05, 09:06 AM
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What's optimal temperature spread for programmable thermostat?

In the past it was not recommended to vary temperature for heat pumps as they lose their efficiency when trying to catch up. Modern thermostats for heat pumps allow to set back the temperature when you're away or at night. But too much difference will cost heatp pump its efficiency, too little difference doesn't translate into savings.

Does anyone know (or have a link to) what is the optimal temperature spread (3, 5, 8 degrees?) that will give the most savings?
Old 11-04-05, 06:45 PM
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Usually a 2 degree is the standard. A lot depends on the house and how well it's insulated.

Old 11-04-05, 08:07 PM
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if your gonna be gone for a week or so set it back to where evr you want it.

If only for the day while you are at work, running the heatpump all day will cost you less than running the strip heat to catch it back up when you get home so leave it.

Unless you have an outdoor thermostat that keeps the stirps off unless the temps are low outside, then you can turn it down, but it will take a while to heat it back up.
Old 11-10-05, 04:06 PM
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The Honeywell I just bought actually "learns" (over a period of days) how long it takes to recover without the heat strips so that it can bring temp back up by the set time without them.

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