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 - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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