4 ms·
I'm not sure you understand. The required energy is around 4X the baseline. Most smaller homes could heat on a 220V 20A circuit until it get's very cold (-5f or
by pcdoodle 4y ago
I'm not sure you understand. The required energy is around 4X the baseline. Most smaller homes could heat on a 220V 20A circuit until it get's very cold (-5f or more), at this point you're up to almost 80A @ 220VAC additional resistive heating load per home.
- tzs 4y agoYou wouldn't use resistance heating at -5℉ with a reasonably modern heat pump, such as Mitsubishi or Fujitsu models designed for cold climates. The Mitsubishi ones don't become less efficient than resistive heating until the temperature drops below -15℉. They are 200% efficiency at 0℉ and 300% at 32℉. Their capacity drops from 100% at 23℉ to 76% at -13℉ so you would want to go with a slightly bigger system than you would in a place that doesn't get so cold.
- pcdoodle 4y agoThanks for adding more info to my "back of napkin" comment. Heat pumps are fantastic where they make sense, it's -5f here and my 24,000 btu unit is keeping up in 1,000sq ft (DC Inverter Type).