Why are COPs not higher ?
When it comes to heat pumps I regularly see heat pumps with COPs quoted at 45 degree outdoor temperatures in the 2.5-3.5 range. My question is what is the limiting factor in there designs that prevent us from having higher COP pumps?
I was inspired by the ideas in most recent post: https://www.greenbuildingadvisor.com/article/heating-fuel-cheaper-electricity-natural-gas
Where I live the ratio of gas/electricity prices for equal energy content is about 1:3. That is, 1 unit of energy in gas can be delivered to me for about 1/3rd the price of that same unit of energy as electricity.
However, interestingly, where I live, in the NYC area, the median half hourly air temperature on a heating day, is around 45 degrees (happy to share the analysis). So, I’m right on the cusp here, if a heat pump with a COP a decent amount above 3 the ratio of electricity/gas prices was to show up, converting away from natural gas would save me money on my energy bill.
Is is there any reason not to expect this soon?
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