HVAC linear setback recovery projection calculator

Calculate linear warming slope and projected time to target with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use linear warming slope and projected time to target to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Times since recovery started (minutes)
0,15,30
Measured room temperatures (°C)
16,18,20
Target room temperature (°C)
21
Linear warming slope (°C/min)
0.133333
Projected time to target (minutes)
37.5

Try another scenario

Times since recovery started (minutes)
[1, 15, 30]
Measured room temperatures (°C)
[16, 18, 20]
Target room temperature (°C)
21
Linear warming slope (°C/min)
0.137876
Projected time to target (minutes)
37.091954
Calculation method

Calculation method

Linear warming slope (°C/min)

Least-squares trend projection from observed recovery temperatures, not a thermal plant simulation.

Projected time to target (minutes)

Least-squares trend projection from observed recovery temperatures, not a thermal plant simulation.

Symbols and units
a
Times since recovery started (minutes)
b
Measured room temperatures (°C)
c
Target room temperature (°C)

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • User-supplied measurements and assumptions; Least-squares trend projection from observed recovery temperatures, not a thermal plant simulation. Supported limits: Finite numeric values bounded to 1e9 magnitude; lists and tables contain 1–100 records unless a stricter bound is stated. Inputs use the units shown. Lists explicitly paired by a method must have matching lengths; independent polynomial coefficient vectors may differ. Respect stated physical, interpolation, policy and computational domain limits.
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Further reading

Method reference ↗

Background reading; this does not imply endorsement or independent review of SumFizz.

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