How do you actually justify a preventive maintenance contract — what does downtime really cost?

Short answer: the honest way to decide is to price the DOWNTIME, not just the contract. For each piece of equipment ask: if this fails at the worst time, what does it cost me — lost revenue while it's down, spoiled stock, emergency call-out premiums, secondary damage, and reputation? Then weigh that (times how likely a failure is) against the cost of preventing it. Preventive maintenance pays clearly where downtime is EXPENSIVE and failures are PREDICTABLE/preventable — cooling and refrigeration in a hot climate, revenue-critical kitchen lines, anything whose failure stops trading or spoils stock. Reactive ("run to failure") is defensible only for cheap, non-critical, quickly-replaced items whose failure costs you almost nothing.

Frame the downtime cost by asking: - Lost revenue while down: a restaurant with no cooling or a dead fryer line in service, an office/retail unit that can't trade in the heat — revenue stops, and in UAE summer "no cooling" can mean closing. - Spoiled stock / secondary damage: refrigeration failure spoils inventory; a leak or overheating damages more than the failed part. - Emergency premiums: reactive means paying rush rates for call-outs and parts, at the worst moment, with no negotiating position. - Reputation / customer loss: a closed or uncomfortable venue costs future custom, not just today's.

Where prevention clearly pays: - Cooling/HVAC & refrigeration in this climate — high downtime cost, and most failures (blocked coils, refrigerant, worn parts) are preventable with planned servicing. This is the textbook case for a contract. - Revenue-critical / hard-to-replace kit — long lead-time parts, anything whose failure stops the operation. - Safety/compliance-linked systems — failure has consequences beyond money.

Where reactive is reasonable: - Cheap, non-critical, quickly-swapped items whose failure barely interrupts anything — over-servicing those wastes money. Prevention isn't automatically right for *everything*; it's right where the downtime maths says so.

The business case: - Preventive cost is known and budgeted; breakdown cost is large, unplanned and badly timed. Prevention converts a nasty variable risk into a predictable line item — which for critical kit is usually cheaper over a year than the breakdowns it avoids, before you even count the lost trade.

Common mistake: treating it as all-or-nothing, or deciding purely on the contract's sticker price while ignoring what a peak-summer failure actually costs. Rank your equipment by downtime cost, put the planned maintenance where the maths clearly favours it (cooling first, in this climate), and run the trivial stuff reactively. Operators — what breakdown ended up costing you far more than prevention would have?