How I Fixed My “Terrible” Heat Pump Efficiency (COP Now 4.36!)

Published at : 23 Dec 2025

Get a Heat Pump Quote: https://tech.referrals.octopus.energy/uOYXOG2p

Wondering why your heat pump efficiency drops in cold weather? In this video I take you through my real-world data, showing how my COP went from 2.38 (238% efficient) during a cold snap all the way back up to 4.36 — and the simple tip every new heat pump owner needs to know.

I break down daily, weekly and monthly performance using the Vaillant app, explain how defrost cycles impact efficiency, and show how cheap-rate tariffs, solar and battery storage help keep running costs low.

Whether you’re new to heat pumps, worried about winter performance, or trying to understand your energy bills, this video will give you the perspective and confidence you need.

Chapters:
• Why COP crashes in cold snaps
• The simple “efficiency trick” anyone can do
• My real electricity usage and COP data
• Cheap-rate tariffs, solar and battery tips
• How to manage a heat pump without batteries or solar

If you’re considering a heat pump, already have one, or want to save money on your heating this winter — this video is for you.

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New Heat Pump Owners: Don’t Make This Rookie Mistake
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My system :
Sunsynk 8.8kW Inverter
Longi HiMo 6 430w Panels x 22
16 NW facing & 6 SE facing
Installed by Dorset Solar Solutions
20kWh Dyness Battery

Vaillant Arotherm Plus 7kW Heat Pump
200L UniStor Cylinder
45L Buffer tank
140sqM Detached 1997 built house
10mm copper microbore pipework downstairs
Installed by British Gas