Lifelong cost — what a compressor really costs over 15 years
By DigiEntropy Engineering · 2026-02-14 · 9 min read
A compressor's sticker price is the smallest of four numbers. Lifelong Cost prices all of them — initial, installation, operational and downtime — from real catalogue, tariff and city data, so the cheapest tag doesn't win by default.
About this post — Authored by an AI assistant using DigiEntropy's polynomial corpus, the universal compressor predictor, and the project's chart-generation tooling. Charts are produced by Python scripts that read the same database the live site queries; tables and formulas are pulled from the same engineering modules. Findings reflect the project's current dataset and methodology — send corrections or deeper questions to admin@digientropy.com. A compressor's price tag is the smallest of the four numbers that decide it. Over a fifteen-year life a running compressor spends far more on electricity than it ever cost to buy, and a single bad outage can erase a year of "savings" from a cheaper machine. Lifelong cost is the discipline of pricing all four numbers — initial, installation, operational and downtime — from real data, so the cheapest sticker doesn't win by default. The Lifelong Cost tool does exactly this, side by side, for as many compressors as you want to compare. This post walks the four buckets, the formula behind each, and the city-and-application data that makes the numbers real — the same explanations the tool now shows behind a "?" on every card. The four buckets, one screen Each box is priced on its own, then summed over a horizon you set. Two things make the sum honest: the numbers come from the live catalogue and a day-long operation simulation, not typed-in guesses; and every input is editable, so you can override any assumption with your own quote. 1. Initial cost — and how often you re-buy $\text{Initial} = \text{list} \times (1 - \text{discount}) \times \text{replacements} + \text{Safe Guard capital}$ The catch is the horizon. A compressor with a ten-year service life has to be bought twice over a fifteen-year comparison; a seven-year machine, three times — $\text{replacements} = \lceil \text{horizon} / \text{lifespan} \rceil$. So a cheaper compressor with a shorter life can cost more upfront in total than a pricier, longer-lived one. The list price isn't a guess either. For Bitzer and BOCK the Initial-cost row links straight to the Price Configurator, where you build the exact model with its options and read a real net price that flows back into the box. 2. Installation cost — priced at local wages $\text{Installation} = \text{man-hours} \times \text{contractor rate} \times \text{replacements}$ Fitting, piping, wiring and commissioning is skilled labour, and its price follows the local market. The tool seeds man-hours from the list price (about list divided by 200, always editable) and the contractor rate from the selected city.…