Why one vendor
Vertiv™ is our only partner in this category — on purpose.
A rack UPS, a facility UPS, and the cooling above them all need to speak the same protocol and fail over the same way. We standardized Critical Power & Cooling on one manufacturer so the pieces are designed to work together, the spare parts interchange across your fleet, and there’s a single number to call when something needs attention — ours, and Vertiv™’s factory support behind it.
Start with the UPS
The most-requested piece first, then everything it needs.
Nine in ten quotes in this category start with a UPS question, so that’s where we start too. Vertiv™’s Liebert® line covers the same three tiers whether you’re protecting a single network rack or an entire facility — we size the unit to your load, not the other way around.
Rack-level protection that doesn’t take up rack space you need.
The Liebert® GXT5 is a lithium-ion, online double-conversion UPS built for the network closet, the edge site, or the single rack that can’t go down — a control room switch stack, a security head-end, a local server. Lithium-ion cells run cooler, last longer, and take up meaningfully less footprint than the legacy VRLA unit they replace, and the unit reports state of health back to your monitoring platform so a battery replacement is scheduled, not discovered.
Add capacity as the room grows — not before you need it.
The Liebert® APM2 is a modular, three-phase UPS for the server room or mid-size facility that expects to grow. Power modules are hot-swappable, front-accessible, and add in place, so a facility can start at the load it has today and scale toward 600 kW without re-specifying the room or taking a planned outage to do it.
Where the whole facility rides on one bus.
The Liebert® EXL S1 is a transformer-based, three-phase UPS built for data center and large-campus scale — the tier where a single unit protects the whole building, not one room in it. It’s engineered for sustained high-load efficiency and for the redundant, parallel configurations that large facilities specify as standard.
Between the UPS and the load
Getting protected power where it needs to go — and keeping it there.
A UPS is only half the answer. Vertiv™’s distribution and continuity gear moves that protected power from the battery room to the floor, and keeps it flowing if a utility feed or a UPS itself needs to come off line.
Vertiv™ Liebert® TFX
Floor-mount power distribution
Takes UPS output and breaks it down to panelboard-level circuits for the floor, with built-in metering and remote monitoring of every branch circuit.
View Specs →
Vertiv™ Liebert® STS2
Static transfer switch
Switches a critical load between two independent power sources in a quarter cycle — fast enough that connected equipment never sees the transfer — for dual-corded loads that can’t tolerate a gap.
View Specs →
Cooling that scales with the room
Four tiers, one CoolPhase™ platform.
Heat is a byproduct of every watt the UPS protects, and it has to go somewhere. Vertiv™’s CoolPhase™ and SwitchAir™ lines cover the same four tiers as the UPS lineup — a single rack, a row, a room, and the whole facility — so cooling capacity grows in step with power capacity instead of getting re-specified at every stage.
Cold air that travels inches, not across the room.
CoolPhase™ Row units sit in the rack row itself, drawing hot exhaust from the aisle behind and returning conditioned air directly in front of the racks that need it. Because the cooling source sits where the heat is generated, a room can run at meaningfully higher rack density than perimeter cooling alone supports, without hot spots forming between units.
Precision cooling for the room that doesn’t have a raised floor.
Most server rooms outside a purpose-built data center don’t have a raised floor or central plant to tie into — they have a wall. CoolPhase™ Wall units mount directly to it, giving a converted office, a school’s network closet, or a hospital’s IT room dedicated precision cooling with humidity control, without ductwork or construction.
Side by side
Three UPS tiers, compared.
| Spec | Liebert® GXT5 | Liebert® APM2 UL | Liebert® EXL S1 |
|---|---|---|---|
| Capacity | 1–3 kVA | 10–600 kW | 250–1,200 kW |
| Topology | Online double-conversion | Online double-conversion, modular | Online double-conversion, transformer-based |
| Battery | Lithium-ion | VRLA or lithium-ion | VRLA or lithium-ion |
| Form factor | Tower or 1–2U rack-mount | Modular frame, hot-swap power modules | Free-standing cabinet(s) |
| Typical fit | Network closet, edge, single rack | Server room, mid-size facility | Data center, campus-scale facility |
| Scales by | Adding units | Adding power modules in place | Paralleling additional frames |
Exact model numbers, redundancy configuration (N, N+1, 2N) and runtime are confirmed at quote against your named load and battery string. All three tiers are backed by Vertiv™ factory warranty and serviced by the Vertiv™ field network.
Backed by the manufacturer, not just the reseller
Vertiv™ runs the world’s data centers. We put that behind your facility.
Vertiv™ is one of the largest critical-infrastructure manufacturers in the world, with a global service organization built around keeping this exact equipment running. When Uptime specifies Critical Power & Cooling, your facility gets Vertiv™’s factory warranty, parts availability, and 24/7 field service — coordinated through a single point of contact on our side.
Common questions
Critical Power & Cooling FAQs.
Tell us your load. We’ll size the tier.
A voltage, a kVA or kW figure, and a sense of the room is enough to start — we’ll come back with a Vertiv™ configuration sized to your facility, not a catalog default.