Hacker News Reader

Pretty sure mini splits are significantly more efficient today, with SCOP of above 5, so that seems unlikely?

I recently replaced my [central, ducted] heat pump, and the new one is rated with a 4.981 SCOP. It's fairly efficient, but not the most efficient on the market.

-40% for the duct heat loss

That seems kind of high for insulated ducts, where does that number com from?

US energy.gov

It would be nice to actually link the source[1] (PDF).

The stat is that you lose between 25-40% efficiency for "typical" existing installations. The document goes on to explain that an insulated duct which doesn't leak doesn't have this kind of efficiency loss.

[1] https://www.google.com/url?q=https://www1.eere.energy.gov/bu...

This unit runs at about 5

Reply on news.ycombinator.com