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Careful_Square1742 t1_j74vt46 wrote

Reply to comment by zoomwojo in Some data on heat pump performance today by happyhourscience

you're close - it ramps the compressor in bursts to defrost the coil.

I have a Daikin system that doesn't have a hyper heat function. it's still able to pull heat from outside air at -15 pretty efficiently. below -20 it works hard but it's kept up as low as -26 before.

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wrenchindaddy802 t1_j76cz1l wrote

This is where the geothermal setups really shine.

Fuck, I'd love me some heat pumps, let alone a geo setup.

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Careful_Square1742 t1_j76eyxb wrote

geo's awesome, if you have the right conditions (and bank account).

-17 at my house this morning and the heat pump system is purring. it goes into defrost for 5 minutes every 45 minutes or so, but the temp inside is within a degree or two of set point.

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zoomwojo t1_j74w0un wrote

As in, shakes the frost loose from the coil by abruptly starting?

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Careful_Square1742 t1_j74xbf3 wrote

nah a buzzer goes off to tell me to go out there with a hairdryer

it defrosts by pulling heat from inside briefly. like cooling mode but it doesn't run the fans on the evaporator (inside unit)

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