Heat pump efficiency

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Old 01-04-13, 12:24 PM
J
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Heat pump efficiency

What is the most effcient (low cost) way to operate a heat pump? Should we use one temp setting 24 hours a day? Is it different for hating and cooling? In HEAT mode if we set it back 6 or 8 degrees overnight, does the AUX Heat cycle in the morning cancel out any overnight cost savings (outside temps below 30 F). In COOL mode is there any reason not to set it lower overnight? Thanks, Jim
 
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Old 01-04-13, 12:51 PM
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The most efficient setting is the lowest temperature you're comfortable at without setbacks.

You're right about the use of aux heat to recover - uses more energy than what's saved during the setback period.

Only fossil fuel and electric forced air furnaces should be set back.

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In COOL mode is there any reason not to set it lower overnight? Thanks, Jim
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No, but don't set it much lower though - 4F lower, maximum.

If your utility has time of use rates or if you like it colder at night it's a good idea.
 
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Old 01-04-13, 06:33 PM
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Thanks, Muggle. Much appreciated.
 
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Old 01-06-13, 02:37 PM
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This is our family's tolerances with heating and cooling. (YMMV) Heat pump thermostat is set for 72 and 80. AT 72 or below, the heat pump is in heat mode, at 80 or above the heat pump is in cool mode. It has been on "auto" since installation in 2000 and we have not changed it.
 
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Old 01-06-13, 03:38 PM
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I flipped the heat strip breaker in the air handler on our heat pump. That prevents the heat strip from coming on and will allow you to turn the thermostat down at times with out costing an arm and a leg when you jack it back up. It does make it harder for the HP to keep the house warm during extreme cold spells but then I do have a wood stove

almost forgot welcome to the forums Jim!
 
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