Central vs Individual HVAC in Multifamily Properties

The HVAC configuration decision on a multifamily property gets made once — usually at design or major renovation — and then everyone lives with it for the next 20-plus years. Choose a central plant and you're locked into shared metering complexity and one chiller failure that can take down comfort for the whole building; choose individual per-unit systems and you've traded that risk for higher total mechanical square footage, more equipment to maintain, and a maintenance team that now needs eyes on hundreds of small units instead of one plant room. Neither option is universally "better" — the right call depends on building age, unit count, climate, and how you want to bill for utilities. This guide breaks down capital cost, operating cost, submetering and billing fit, tenant control, and maintenance load for both configurations, plus a simple framework for choosing between them on new construction or a major retrofit. Book a Demo to see how OxMaint tracks HVAC assets and maintenance load differently for central-plant vs. distributed-unit properties.

Multifamily Property · HVAC Strategy · Capital & Operations

Central vs. Individual HVAC in Multifamily Properties: The Decision Guide

One chiller room or hundreds of small units — the choice shapes your capital cost, your utility billing model, and your maintenance workload for decades. Here's how to choose correctly the first time.

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Central Plant or Per-Unit — The Core Trade-Off in One View

Before the detail, here's the shape of the decision: central systems concentrate cost, risk, and control in one place; individual systems distribute all three across every unit. Start a free workspace to model maintenance load under either configuration against your actual unit count.

Central Plant

Chiller/boiler + distribution loop

Lower total mechanical equipment count
Single point of failure risk
Efficient at scale, harder to submeter
Specialist technicians for plant equipment
Long equipment life (15–25+ yrs typical)

Individual (Per-Unit)

PTAC / mini-split / packaged unit per apartment

Higher total equipment count, distributed risk
One failure affects one unit only
Straightforward direct or sub- metering
Simpler per-unit repairs, more of them
Shorter equipment life (10–15 yrs typical)

Capital & Operating Cost — Where the Money Actually Goes

Central systems generally cost less per square foot to install at scale and run more efficiently in aggregate, but individual systems shift the ongoing utility spend — and the failure risk — directly onto whoever pays the bill.

Upfront Capital

Central: lower cost per unit at larger scale, offset by plant room, chiller/boiler, and distribution piping build-out.

Individual: higher aggregate equipment cost, but no shared distribution infrastructure to build.

Ongoing Utility Cost

Central: typically billed to ownership unless submetered — efficient in aggregate but hard to attribute fairly per unit.

Individual: electricity often runs 40–60% of total utility cost on properties with per-unit systems, with wide unit-to-unit variance based on resident habits.

Equipment Replacement

Central: one major capital event per plant cycle — expensive, but scheduled and predictable.

Individual: continuous small-dollar replacements spread across the year — no single shock, but constant.

Whichever You Run, You Can't Manage What Isn't Tracked

One chiller or three hundred PTAC units — OxMaint logs every HVAC asset, its service history, and its failure pattern, so you know exactly where the next dollar of maintenance spend is actually going.

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Billing & Submetering — Which Configuration Fits Your Utility Model

How you plan to bill for utilities should influence which configuration you choose, not the other way around. Here's how each maps to the common billing approaches.

Included in Rent

✓ Natural fit

✓ Works, but removes conservation incentive

RUBS (Ratio Billing)

✓ Common workaround

✓ Common, though less precise than direct metering

Full Submetering

△ Possible, costlier retrofit

✓ Straightforward — usually just an electric meter per unit

Direct Utility Metering

✕ Not compatible with shared plant

✓ Ideal fit — each unit's usage is inherently separable

Individual systems pair naturally with per-unit billing because usage is already physically separated at the equipment level. Central plants require retrofitting metering onto a shared loop — technically possible, but a materially bigger project.

Maintenance Load — One Plant Room vs. Hundreds of Units

This is where the day-to-day operational difference is starkest, and where most owners underestimate the individual-system side of the ledger.

Failure Frequency

Central: rare, but a failure can affect every unit at once. Individual: frequent small failures, each isolated to one apartment.

Technician Skill Mix

Central plants need specialized chiller/boiler technicians. Individual systems need a larger team comfortable with routine unit-level service calls.

Access & Scheduling

Central: plant room access only. Individual: every service call requires resident coordination and unit access.

Preventive Maintenance Volume

Central: fewer, larger PM tasks per year. Individual: hundreds of smaller recurring PM tasks — filters, coils, refrigerant checks — across the portfolio.

Which Configuration Fits Your Property? — A Quick Decision Framework

Use these as directional signals, not absolutes — most large-scale decisions combine two or three of these factors.

Choose Central When…

Large unit count with uniform usage patterns
Utilities included in rent or billed via RUBS
Climate favors efficient shared chilled/hot water loops
Ground-up construction with plant space designed in

Choose Individual When…

Direct or submetered billing is a priority
Renovation without practical space for a plant/distribution retrofit
Residents want per-unit thermostat control
Smaller or garden-style property layout

We inherited a 180-unit property with individual PTAC units and assumed the maintenance load would be light because each failure was small. It wasn't — we were running dozens of service calls a month across the portfolio, and without a system tracking which units were repeat offenders, we kept replacing the same handful of units' compressors every year instead of just swapping the unit. Once we started logging every call by unit and pattern, the repeat-failure units became obvious within a quarter, and our per-unit repair spend dropped noticeably the next year.

Director of Property Operations · Garden-Style Multifamily Portfolio

Frequently Asked Questions

Is central or individual HVAC cheaper overall for multifamily?

Central systems are usually more efficient and cheaper per unit at scale on the capital side, but individual systems better isolate cost and failure risk to one apartment at a time. The cheaper option depends heavily on unit count, climate, and billing model — there's no universal answer.

Can a central plant building be submetered later?

Yes, but it's a larger retrofit than adding electric submeters to individual units, since it typically requires metering a shared chilled or hot water loop rather than a simple electric circuit per apartment.

Do individual HVAC systems really cost more to maintain?

Not necessarily more in total dollars, but the maintenance load is structured very differently — many small, frequent service calls across units rather than fewer, larger events at one central plant. Tracking failures by unit is essential to catching repeat-failure equipment early.

Which option gives residents more comfort control?

Individual, per-unit systems generally give residents direct thermostat control over their own space. Central systems can offer this too with proper terminal units, but usually with less independence than a dedicated per-unit system.

How does OxMaint help manage HVAC assets across a large portfolio?

OxMaint logs every HVAC asset — whether it's one central plant or hundreds of individual units — with service history, failure patterns, and PM schedules, so you can see which specific units or plant components are driving your maintenance spend.

What should new construction consider before choosing a configuration?

Confirm the intended utility billing model first — direct metering strongly favors individual systems — then weigh climate efficiency, available plant space, and unit count before finalizing the mechanical design.

Whatever Configuration You Run, Know Exactly What It's Costing You.

OxMaint tracks every HVAC asset — central or individual — with service history, failure patterns, and maintenance cost, so your next configuration decision is backed by real data, not guesswork.

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