Heat Pump COP Boost – I Can’t Explain it!

Published at : 23 Dec 2025

I’ve observed improvements in my Cosy 6 Heat Pumps Coefficient of Performance (COP) since install in like for like conditions. In this video I present data I’ve collected over the last 8 months and invite you to draw your own conclusions.

I compare my data to the official specifications as well as my own install agreement. I look at the key factors behind Heat Pump Efficiency and elements known to boost COP such as outdoor temperature, humidity, hot water vs heating demand.

In addition, I ask the question, could over the air updates be responsible for the improvements I have observed? Join me in getting to the bottom of this mystery. Let me know how your COP varied over the past few months.

00:00 Intro - I Need Your Help!
00:28 Why is Heat Pump Efficiency Important + What aspects affect it?
01:52 Cost 6 COP Expectations
02:23 Monthly COP Data
04:00 Min + Max Daily COP
04:57 Temperature Vs Efficiency
07:13 How Humidity affects Heat Pump Efficiency
08:25 Cosy Over the Air Updates?
10:58 Alternative Theories, Conclusions + Unanswered Questions
12:42 Heat Pump Referral Codes + Wrap Up

Referral Codes / Links
Octopus Energy Heat Pump Install (any model) - £100 discount - Referral Code: 162973523173
Octopus Energy join on any tariff - £50 bill credit - https://share.octopus.energy/onyx-cat-835
Heatable Solar Install - £250 discount - https://htbl.app/T5wW0t
Heatable Battery Install - £150 discount - https://htbl.app/EiUXDK
Heatable EV Charger Install £150 discount - https://htbl.app/uYPj13

Welcome to my channel, Renewable Energy Steve. Here we explore renewable energy tech, notably solar, but also home energy storage, electric cars and heat pumps. ‪@RenewableEnergySteve‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬

Based in West Midlands, UK

#heatpump #renewableenergy #heatpumps #octopusenergy