Every HVAC system eventually asks for a decision: patch it up again, or replace it now. Get that call wrong in either direction and it costs you — replacing too early wastes money still left in a working system, and repairing a failing one too many times can quietly cost more, month after month, than starting fresh would have.
This tool exists to take the guesswork out of that decision. Enter your system's age and the two numbers in front of you — what a repair costs today, and what full replacement would cost — and it converts both into a monthly cost, the same way you'd compare a car payment against a repair bill. Whichever option costs less per month, for as long as it will realistically last, is the fiscally correct choice.
No sales pitch, no pressure. The comparison uses the same replacement-analysis method taught in formal capital-investment decisions, grounded in published guidance from the U.S. Department of Energy and ENERGY STAR — not an industry rule of thumb built to nudge you toward new equipment.
