> On Mar 22, 2021, at 7:17 PM, EVDL Administrator via EV <[email protected]>
> wrote:
>
> On 22 Mar 2021 at 11:33, Willie via EV wrote:
>
>> How can they efficiently extract heat from such cold air? I'm eager
>> to learn details and see evaluations.
>
> They can indeed extract heat, but I'm not so sure "efficiently" necessarily
> applies.
>
> I have a Mitsubishi Mister Slim M series mini-split. It's supposed to
> produce 100% of its rated output at 5 deg F and significant heat to -13F.
> Anecdotally, that seems to be the case. Certainly there is still plenty of
> output. However from what I've read the COOP falls apppreciably at those
> temperatures. Generally when temperatures fall into the single digits F, I
> switch over to separate resistive baseboard heat to give it a break.
…and if you look at the accessories Mitsubishi offers for that line of air
handlers, like the very first one is a supplemental resistive heating insert.
-Bill
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