Lets not argue or any tat-for-tat but rather get some good information out to folks.
Buickddeere is right as to underground pipe, wells, etc would be matched to the compacity of the heat pump. The heat pump is designed to meet most situations.
In Minnesota/South Dakota, as other places, there are the extremes. Here geo-thermal units are installed with auxiliary heat source or secondary stage duct heaters to meet the extremes. My understanding is that installing a system to heat a house at the extemes (5F to -35F) would be cost prohibitive and therefore the need for auxilary heat source. It is cheaper to use auxilary heat for extremes than to purchase excess capacity.
A couple thoughts/situations. ----- Your are caught in a storm away from home and power goes out. When you get home you hook-up your generator -- but the house is cold (say 55F) Your thermostats are hardwired into 110V and are programmed to maintain the house at 68F. The generator starts and thermostats call for geo thermal heat plus auxiliary backup. Remember the thermostat is trying to raise house to 68F ASAP. Calculate the watts needed at this point as this is surge(?) -- remember system is efficient when up and operating. This also assumes you turned off your refregerator, deep freezer, etc.
Thinking outloud could this problem be solved if a person puts batteries in thermostat so a person can lower thermostat to house temperature (ie. 55F) --- get tractor/generator to 540 and then slowly raise thermostat only engaging geo thermal and not aux heat? I have swicthes on geo thermal unit to turn off aux heat.
Regardless, I worked with electician to "do the math" ahead of time. 17K in my house must be managed manually with switches. ---------
Mistake I made recently that cost me real $$$. I was lowering my thermostat 6F at night while family slept. I was first-up in the morning and would "crank up the heat" 6F degrees so everyone would be happy. My thermostat was set to call for auxiliary heat if the temperature difference was greater than 2F. I was heating the house in the morning with the more exspensive aux heat source. Kinda defeated the whole purpose of turning the heat down while family was "undercovers". I have since read the thermostat manual and dicovered that I can set the thermostat to call for aux heat ir the difference is more than 6F degrees. Result, it takes longer for me to heat the house in morning but I am using the more economical geo thermal to do it. ----------
As I said, I am not fighting with anyone. Prove me wrong and it saves me $$$.
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