Temperaturemapping
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Lifecycle · changes · seasonal risk

How often should temperature mapping be repeated?

There is usually no simple standard answer for every storage area. The frequency should be risk-based and fit the products stored, the criticality of the temperature limits and the stability of the space.

Practical principle

Do not repeat the same test blindly every year. Define a justified frequency and clear triggers for requalification.

Short answer

Temperature mapping should be repeated based on risk. Requalification is especially relevant after relocation, repair, layout changes, recurring alarms, deviating trends or according to the periodic frequency defined in the quality system.

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What do GDP, WHO and ISPE say?

EU GDP links temperature mapping to initial use, risk and changes to facilities or temperature-control equipment. WHO describes mapping as a way to define and control the temperature distribution in storage areas. ISPE develops this into a risk-based lifecycle approach for controlled temperature chambers.

View the central guidelines page

Risk-based requalification

For temperature-controlled storage, requalification is about whether the temperature distribution is still reliable. A small fridge with a stable history has a different risk profile from a large cold room with many door movements.

It is therefore sensible to define the frequency in your quality system or internal procedure, including why that frequency is appropriate.

When is requalification always sensible?

  • After purchase or first use of new equipment.
  • After relocation of a fridge, freezer or cold room.
  • After repair to cooling system, door, sensor, ventilation or control system.
  • After refurbishment or change to the room.
  • After structural temperature deviations or repeated alarms.
  • After a change in loading, storage layout or product criticality.

Practical risk factors

FactorWhy it matters
Product criticalityThe more sensitive the product, the stronger the justification for requalification should be.
Temperature historyFrequent alarms or deviations indicate higher risk.
Door movementsFrequent opening and closing can affect temperature distribution.
Room layoutRacking, pallets or new loading patterns can change airflow.
Seasonal influenceIn some rooms, summer or winter conditions can affect thermal load.

Do you need summer and winter mapping?

It depends on the space. WHO describes that for storage areas affected by seasonal conditions, mapping in the warmest and coldest periods may be needed to assess worst-case conditions throughout the year.

Ambient storage rooms, warehouses, areas with external walls, loading docks, windows, frequent door movements or strong HVAC load can be season-sensitive. For cold rooms and freezers, separate summer and winter mapping is not always necessary, but the rationale should be documented.

What is a sensible approach?

Document when periodic requalification is performed and which changes trigger a new assessment. This prevents discussion during audits and internal reviews.

We can help define a practical requalification approach that fits your equipment, products and risks.

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Sources used

  • EU GDP 2013/C 343/01, chapter 3.2.1 on initial mapping and repetition based on risk or changes.
  • IGJ FAQ on the EU GDP guideline, version 9.
  • WHO TRS 961 Annex 9 Supplement 8, Temperature mapping of storage areas.
  • ISPE Good Practice Guide: Controlled Temperature Chambers, 2nd edition.