How to use degree days

[@jamiefox54]

Thanks for this. I have just reached 1 year since heat pump install so I am comparing vs the previous year of gas boiler by looking at readings so this was useful.

[@allthegearuk]

Thanks for this. It's really hard to find historical weather data to compare energy usage year to year.

[@TomBray-LowCarbonLifestyle]

No problem - glad it was helpful. Degree days take a bit of getting your head around but really useful when you do!

[@wajopek2679]

Little confused. Isn't Weather Compensation supposed to take care of all this on a daily basis which negates any further tweaking?

[@TomBray-LowCarbonLifestyle]

Yes weather compensation means we call for less heat when it is warmer outside. But you can also tweak the curve that the weather compensation follows. As well as a bunch of other settings that can be changed in our controller

[@Simon-kq1xu]

Tom I'm still struggling to understand how to use degree days aside from retrospective analysis?

[@TomBray-LowCarbonLifestyle]

Hi Simon, I use them retrospectively to compare the amount of heat I would have needed from one day to the next, can then see if any changes I had made to heat pump settings were beneficial or not in estimating kWh per degree day. Hope that make sense?

[@Simon-kq1xu]

@Tom Bray Thanks Tom, yes it does now. All things being equal they could be useful for adjusting the heat curve - assuming the vagaries abs effects of climate change don't have significant disruption in weather patterns. BTW guess who now has a Valliant ASHP too? Seeing that you had the Ecotherm definitely influenced my decision

[@TomBray-LowCarbonLifestyle]

That’s brill to hear Simon! Hope it is keeping you nice and warm?!

[@Simon-kq1xu]

@Tom Bray Its been great, and a relief too. Install took longer than planned when it got desperately cold! Excited about COP rates already achieved. I'm thinking about how I will record details and calculate the adjustments to the heat curve settings systematically

[@Simon-kq1xu]

@Tom Bray woohoo! COP of 3.4 on heating and for hot water now!