[email protected] wrote:
Ok. Now I know what you guys are talking about. My father installed one years ago in a flat in Athens, Greece where I grew up. It was mounted high up near the ceiling. Compressor was outside on balcony. We used it for AC. Are these that good for heat as well?
The ones from the top manufacturers (Mitsubishi, Fujitsu, Daikin, maybe LG,Samsung,Toshiba) with DC compressor motors are. The key phrase is 'inverter drive'. Often with oversize compressors, they loaf along during A/C and mild weather heating, then go to full power (and sometimes beyond) when it gets really cold outside.
My Fuji is AHRI rated to put out 12,000 BTU/hr at 47° ambient but it's capable of running from 1700 to 15,000 BTU/hr at that temp. Rated output drops to 8100 at 17° and 6600 at 5°, I assume max is around 1/4 higher. If you're used to old fashioned heat pumps, the fact that it's usable below 17° is a minor miracle. My house draws about 30,000 BTU/hr when it's 0°F outside, I hope to get that down around 24,000, so a single 3/4 ton mini split is just a supplement to the furnace like having a fireplace in the living room.
The Hyper Heat Mitsus and the RLS series Fujis are really impressive in heat mode when they overdrive the compressor at low ambient temps. I think the MSZ-FE Mitsus are a real bargain for heat, unfortunately only available in 3/4 ton and 1 ton sizes. The comparable Fuji costs 20% more, and the top of the line Daikin 50% more.
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