A freezer unit tends to use more energy while it ages. However, the embodied carbon of a new unit is always huge.
To decide whether or not to replace an old freezer with a new, more-efficient one is not straightforward. You will need to balance the energy costs of keeping the old unit with the disposal impact and also the embodied carbon of a new unit. At the same time, keep in mind that energy sources tend to be greener over time.
If in doubt, talk to an expert, but keep away of greenwashing!
Ultra-low temperature freezers: When to replace?
Despite energy costs increasing with equipment ageing, replace old equipment as a last resort only.
Energy & Water