Coefficient of performance at 3 is under ideal conditions so don't expect to actually see it. One other thing people don't realize is when it gets frigid like it has this week a heat pump is less efficient than the resistance heat strips the emergency heat uses. Any heat pump will check the coil temp every thirty minutes, hour, or hour and a half to see if it needs defrosting. With the frigid temps we've seen this week it will go into defrost and switch to ac every time it checks. The heat pump uses the same amount of power whether it's running in heat mode or ac mode BUT every time it goes into defrost you are also using the heat strips to counter the ac. That's when it's using more power than plain old resistance heat.
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Today's Featured Article - Restoration Story: 1964 JD 2010 Dsl - Part 2 - by Jim Nielsen. Despite having to disassemble the majority of my John Deere 2010's diesel engine, I was still hopeful I could leave the engine-complete with crankshaft and camshaft-in the tractor. This would make the whole engine rebuild job much easier-and much less expensive! I soon found however, that the #4 conrod bearing had disintegrated, taking with it chunks of the crankshaft journal. As a resul
... [Read Article]
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