Short answer
Reactive maintenance costs a store in disruption: unplanned downtime, staff time, rushed decisions, and no data. Preventive maintenance moves that work onto a schedule the store controls, and produces records.
What is the real difference between the two models?
Reactive maintenance means waiting until equipment fails or a store complains, then dispatching a repair. Preventive maintenance means inspecting and servicing equipment on a schedule, finding and correcting problems before they cause failures. Most portfolios run a mix.
The question is where the balance sits.
The financial case is covered elsewhere, including in the blog's article on the true cost of deferred maintenance. This article looks at something less often measured: what each model costs the store itself in operations, time, and control.
What does reactive maintenance cost a store?
Reactive maintenance costs a store in disruption, staff time, trading impact, rushed decisions, and missing data, because failures arrive on their own schedule instead of the facility team's.
- Unplanned disruption. Failures arrive on their own schedule, which is often the hottest afternoon of the week, when the store is busiest and every contractor in the region is in demand.
- Staff time. A store manager who should be running a shift instead fields complaints, calls the help desk, escorts a technician, and manages customers in a warm store.
- Trading impact. Customers leave warm stores sooner. Some merchandise, such as chocolate, cosmetics, or medication, is temperature-sensitive. Staff productivity falls in heat.
- Rushed decisions. Repair-or-replace calls made on a single phone call, without history or options, tend to be inconsistent.
- No data. A reactive history records failures, not conditions. It cannot tell you which units are close to failing next.
What does preventive maintenance cost a store?
Preventive maintenance has costs too, and being honest about them helps a program work:
- Scheduled visits. Technicians need roof access, and sometimes access to ceiling spaces or mechanical rooms, on scheduled days. See preparing a store for a PM visit.
- Coordination. Someone must manage the schedule across sites and review the reports.
- Deficiency decisions. PM visits find problems. Those findings need approval and scheduling, which is work for the facility team.
- Commitment. A program only works if it continues. Cancelled or skipped visits erode the benefit.
The difference is that these costs are planned, predictable, and scheduled at times the store chooses.
How do they compare on control?
Control is the clearest difference. In a reactive model, the equipment decides when work happens. In a preventive model, the facility team decides, and most repairs can be scheduled before trading hours, on quieter days, or alongside other planned work.
That is the core of REE Mechanical Inc.'s commitment to minimize disruption: work happens when it suits the store, not when a unit fails.
How do they compare on information?
Preventive programs generate a record for every unit at every visit: condition, measurements, deficiencies, and recommendations. Over time, that record supports capital planning, shows which units are deteriorating, and makes repair-or-replace calls consistent. Reactive histories show only what broke.
For the records that make a program useful, see building an HVAC asset register.
Where sites are connected, trend data adds to that record between visits; see building management systems for multi-site portfolios. A finding that needs work beyond the PM scope is recorded as a deficiency.
What does REE see in its own service calls?
REE Mechanical Inc.'s own view is that about 80% of the service calls we receive could have been avoided with proper maintenance. That does not mean maintenance prevents every failure; equipment at the end of its life fails regardless.
It means most calls trace back to something a scheduled visit would have found: a dirty coil, a worn belt, a failing capacitor, a blocked drain.
What does each model cost the facility team?
The store is not the only part of the organization affected. Under a reactive model, the facility team's week is shaped by whichever units fail, with time spent approving emergency work, chasing updates, and explaining downtime to operations leaders.
Under a preventive model, the same team spends its time reviewing reports, approving planned repairs, and building capital plans from consistent data. The second is still work, but it is work the team schedules, and it produces information that makes the following year easier to plan.
That shift also changes conversations with finance. A reactive history can only show what was spent; a preventive record can show what is likely to be needed next year, by site and by unit.
How do you measure whether the shift is working?
Track a few indicators by site and by quarter: reactive call volume, the share of work that was planned rather than unplanned, the number of deficiencies found per visit, and the number of repeat calls on the same unit.
Falling reactive calls and a rising share of planned work show the program taking hold. A site where reactive calls stay high despite regular visits deserves a closer look at scope, frequency, or equipment condition.
How should a portfolio shift the balance?
Shift the balance in stages: start with the most critical units, set a frequency per site, build the asset register, agree how deficiencies are approved, and review the data each quarter.
- Start with the units that matter most. Sales floors, exam rooms, server rooms, and other critical spaces first.
- Set a frequency per site. Climate and use determine it. See quarterly vs semiannual PM visits for retail.
- Build the asset register as part of the first visit. It is the foundation for everything else.
- Decide how deficiencies are approved. Approval thresholds and turnaround, agreed in advance, keep findings from piling up.
- Review the data. Quarterly review of call volume and deficiency trends shows whether the program is working.
REE Mechanical Inc. designs preventive maintenance and tune-up programs on ANSI/ASHRAE/ACCA Standard 180, scoped site by site. For adding new stores to a program, read onboarding a new store into a maintenance program.
Methodology: Written by REE Mechanical's team from field experience on multi-site commercial portfolios; standards cited link to the issuing body.