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John_W 09-14-2013 08:11 PM

Enough power for Heat Pump in garage renovation?
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We are planning to have our attached garage converted to living space. It is 450 square feet. It will be insulated floor, ceiling and all walls. We live in northern AL.

Our preference is for a conventional unit with the indoor coil and blower mounted in the attic over the garage, feeding conditioned air through ducts to vents in the ceiling.

We have 200 amp service and a dual fuel system (heat pump and gas furnace) in the house proper. At the electrical service panel, there is only one unused 250 v 'slot'. It has 30 amp fuses in it (picture attached).

Is that enough 'juice' to run a second heat pump dedicated to just the renovated garage?


bobelectric 09-15-2013 01:17 AM

Yeow! Fuses? Look into a mini-split heat pump.

PoleCat 09-15-2013 06:47 AM

It is plenty for a Zoneline unit. You know, like in a motel room.

yuri 09-15-2013 08:50 AM

you can run a 2 ton ac off 30 amp fuses/breakers in a house and a heat pump is no different. won't need 2 tons and yeah a 1.5 ton will be too big for that space also. a smaller mini split heat pump may be required. the smallest conventional unit is 1.5 tons and can do a space twice that size. an oversized unit will short cycle badly and get damaged. the Fujitsu mini splits are very quiet indoors. they make one that works down to -15 deg F. after that you would need some baseboard heaters. LG and Mitsubishi are major players and good also.

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