
Smart Thermostat Payback Period Calculator: Your Personalized ROI Formula and Break-Even Timeline
Generic savings claims of 8–26% don't tell you when your smart thermostat pays for itself — your actual payback period depends on four personal inputs. This guide delivers the formula, two worked examples, a 12-scenario matrix, and 10-year projections so US homeowners can calculate their own break-even date before they buy.
Source: ENERGY STAR, TVA EnergyRight, Furnace Outlet case study, DOE climate zone framework



