Is an oversized Daikin really a problem?

[TrystanLea]

Another good example by @Rob-G :

@Rob-G

Octopus performed another survey, and the heat loss report came back at 6.5kW not the nearly 8kW from the original.

They informed me they would replace the 9kW heat pump with an 8kW. They installed the new heat pump last week.

Last October I saw a COP of about 2.5 with a 9kW unit. With the 8kW unit, I am seeing 4.2 so far. I am still seeing some cycling as 15 degrees is borderline for needing heating in my house. It will be interesting to see what happens when it gets a bit colder.