Posted by W_B on March 28, 2014 at 05:01:45 from (155.188.183.18):
In Reply to: Heat pumps posted by Tx Jim on March 27, 2014 at 15:48:47:
George Marsh said: (quoted from post at 06:18:03 03/28/14)
Why are you the only one on YT sees that a heat pump doesn't work in all places?
Where I live, when you need them the most, sub zero temps, they don't work. If you try to use them they end up costing you more.
It's like anything else, you have to know how to use it properly. I can only relate my personal experience for what it's worth. We have an oil fired hot water heat system. Put in A/C unit and ducts when we bought the place (2900 sq. ft. story and a half). Lived with that arrangement for about 5 yrs. as heating oil prices continued to skyrocket. We took out a perfectly good unit (was able to sell it to get some $$ back) and replaced it with a heat pump. Now when it stays above about 30 we leave it in normal mode where the pump runs and if it can't keep up the oil burner kicks on... rarely does. When it turns colder we switch it over to "emergency" heat, that turns off the heat pump, but the inside fan runs, and the oil burner runs for heat. I can say since we made the switch our oil use has been cut dramatically. Unfortunately with heating oil now over $4 a gallon the bill is about the same, I shudder to think what we'd be paying if we didn't have the heat pump.
We had a ground source geo-thermal system in a house we built in 1992. That was the best, most efficient and cheapest heating/cooling system I've ever experienced and would have it again if we got to the point of building again. So, sir, with all respect, your friend who poo-poos geo-thermal is full of cr@p.
I recently got a "toy" that measures air temp and humidity. It's a professional tool that was in a box of tools I bought at an auction from a contractor that was selling out. I measured the air temp coming out of the ducts with just the heat pump running. It was about 85 at peak and 80 running over time. House air temp was at 68. Interestingly the humidity of that air was quite a bit less than the ambient air in the house. So yes, it feels "cold" but wasn't really, it's just cooler than your body temperature. Run long enough the house would heat up probably by ten degrees or more, just would take longer than the oil burner would heat it up.
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