Cold storage EPC upgrades and lighting

The double saving, and why it changes the sums

In an ordinary warehouse, waste heat from lighting is free winter heating and a mild nuisance in summer. In a cold store it is a cost twice over: you pay to produce it and you pay to remove it.

That makes the payback on a lighting upgrade materially better here than the headline lighting saving implies, and it is the reason cold stores often justify a better specification than their floor area alone would suggest. It is also the reason an operator should ask a contractor to quote the cooling effect, not just the lighting saving.

What the fittings have to survive

Standard warehouse fittings are not specified for this. Below freezing, drivers behave differently, seals matter, and condensation on a fitting moving between temperature zones is a real failure mode rather than a theoretical one.

Low-temperature rated drivers, because a driver specified for an ambient warehouse will fail early in a blast freezer.
Sealed housings with an appropriate ingress rating, for washdown and for condensation.
Fittings that start reliably from cold rather than warming up to full output.
Mounting that does not bridge the insulated envelope and create a cold bridge or a condensation path.

The interior of a refrigerated cold store, with racking, frost on the surfaces and sealed light fittings overhead. — Illustrative image generated with AI. Not a photograph of a building we have worked on.

Where the rating actually sits

Because a non-domestic EPC is an asset rating of the building and its services, not of your metered use, refrigeration plant is a large part of what is being modelled in a cold store, and it will usually outweigh lighting. That does not make lighting the wrong first move: it is still the cheapest thing to change, it needs no shutdown of the cold chain, and the cooling benefit comes with it.

It does mean an honest plan here looks further than lighting. Door protection, air curtains, defrost strategy and the age of the plant are all in play, and several of them cost very little.

The operational constraint nobody mentions first

You cannot empty a cold store the way you can empty a warehouse aisle. Stock has a temperature it must stay at, and the cost of moving it or risking it usually dwarfs the cost of the lighting work. Programmes here get built around the cold chain rather than around the electrician.

In practice that means zone-by-zone working, short possessions, and occasionally doing the work during a planned defrost or a stock-low window. Worth raising at quotation stage rather than discovering on site.

Questions we get asked

Does LED lighting really reduce refrigeration costs?

Yes, and that is the distinctive thing about this building type. Lighting energy becomes heat inside the insulated envelope, and the plant has to remove it. Reducing the lighting load reduces the cooling load at the same time, so the saving is larger than the lighting bill alone.

Can we use ordinary warehouse fittings in a cold store?

Not safely. Drivers need to be rated for low temperature, housings need to be sealed against condensation and washdown, and fittings need to reach full output from cold. Standard ambient fittings fail early in these conditions.

Will lighting alone move a cold store EPC rating much?

Less than in an ambient warehouse, because refrigeration plant is a large part of what the assessment models. It is still the cheapest first move, and the cooling benefit comes with it, but a plan that stops at lighting is incomplete here.

Do we have to shut the store down?

Normally no, but the programme is built around the cold chain rather than the electrical work. Expect zone-by-zone working and short possessions, and get that reflected in the quote rather than assumed.

Last updated 8 October 2026.