Cold Weather Scenario (Below Freezing)
Below freezing, COP(T) drops and the economics can change quickly. This scenario focuses on a cold band where interpolation/extrapolation matters.
Try a representative share-link
/?elec=0.18&fuel=gas&price=1.50&afue=0.92&profile=cold&tmin=-5&tmax=35
Important note
DualFuelMath interpolates COP linearly between 47°F and 17°F. For temperatures below 17°F, the calculator extrapolates using the same slope and floors COP at 1.0.
If your equipment has published COP at 5°F or -5°F, compare against that and treat this scenario as an approximation.