- Project plans
- Project activities
- Legislation and standards
- Industry context
Last edited 03 Apr 2018
For example, a heating system might be set to switch on if the internal temperature falls below 20°C, an extract fan might be set to switch on if the relative humidity in a room exceeds 65% and so on.
Set points can be fixed, adjustable or variable. An adjustable set point might be controlled for example by a manually-operated thermostat. A variable set point might be controlled by some form of calculation, for example, set points for air conditioning systems may be programmed to be higher when outdoor temperatures are higher as people are more conditioned to, and dressed for those higher temperatures. Alternatively, if a building is unoccupied, the set point for the heating might be programmed to reduce to just 5°C to prevent pipework from freezing.
The set point at which something is activated may be different from the set point at which it is de-activated. This prevents continually switching on and off if the conditions are very close to the set point.
Set points should be monitored, and checked regularly to ensure that they are correctly set and that they are delivering the required result. Seemingly small changes in set points can have a significant impact on performance and energy use. In addition, some building spaces may house critical operations requiring very specific, closely-controlled set points.
 Find out more
 Related articles on Designing Buildings Wiki
Featured articles and news
Making the case for breathing new life into existing buildings.
Masonry technique from Scotland and Ireland was exported to North America.
Procurement model puts operations in the hands of the client.
Recommendations on face coverings in workplaces.
Putting the rubber IN the road.
Guidance available on latest update from MHCLG.
Style over substance. Book review.
Preventing water penetration using lime grout and injection mortars.
UK Finance names top 10 fraudster tricks to avoid.
Experience Exchange Report collates operating benchmarking data.