Separate fridge and freezer appliances can use up to 20% more energy than a single combination fridge-freezer per year. So if you you have the space, fit a combined appliance to save energy.
Not only will switching to a more energy-efficient fridge-freezer save you money – it will also cut down your energy use by as much as three quarters! A C-rated appliance uses 816 of kWh per year, whereas an A+++ typically uses just 206.
Source: OVO Energy