A central vacuum is a vacuum cleaner that is built into the house. A power unit with the motor and dirt canister is mounted in the garage, basement, or utility room. Rigid 2-inch pipe runs from that unit through the walls to inlets in each area of the home. To clean, you plug a hose into the nearest inlet, the unit starts, and dirt travels through the pipe to the canister. You carry only the hose and the cleaning tool.
The four parts of a central vacuum
Every central vacuum, regardless of brand, is made of the same four parts.
The power unit. This is the canister with the motor, the dirt container, and the filtration. It is the only part that plugs into power and the only part with moving parts that wear. It is sized by the length of pipe and the number of inlets it has to serve, which is why a unit for a 1,500 sq ft ranch is smaller than one for a 5,000 sq ft two-story. Units vary in how they collect dirt: a disposable bag, a permanent cloth bag, a cyclonic bin, or some combination. We cover those in bagged vs bagless.
The pipe network. Thin-wall PVC pipe, 2.0 in outside diameter, made specifically for central vacuums. It is not the same as plumbing PVC. The pipe runs from the power unit to each inlet through walls, floors, the attic, the basement ceiling, or a crawlspace. Alongside the pipe runs a thin two-conductor low-voltage wire that lets the inlet tell the unit to turn on. Once installed, pipe lasts as long as the house.
The inlets. An inlet (sometimes called an inlet valve) is the wall plate with a hinged door and a round opening where the hose plugs in. Behind the plate, the pipe connects. Most inlets have two small metal contacts so that inserting the hose closes the low-voltage circuit and starts the unit. Some inlets also carry 120V so an electric powerhead can run without a separate cord. There are several inlet types and they matter when you buy a hose; see identify your inlet type.
The hose and tools. The hose is usually 30 to 50 ft long and is the only part you move around. On the end goes a wand and a cleaning head: a powerhead with a motorized brush for carpet, a bare-floor brush for hard floors, plus smaller tools for upholstery, crevices, and dusting. The hose type has to match the inlet type, which is the most common thing people get wrong when buying.
Where the power unit lives
The power unit goes somewhere you do not spend time, because it is loud and it is where the dirt collects. The usual spots are the garage, a basement utility area, a mechanical room, or a large closet. It mounts on a wall bracket, needs a nearby 120V outlet (larger units may need a dedicated circuit, and some are hardwired), and benefits from a short exhaust run to the outdoors.
Three practical rules:
- Keep it somewhere above freezing and below extreme heat. Motors do not like an uninsulated attic in summer.
- Leave room below the canister to pull the bag or bin out. Manufacturers specify a clearance; it is usually a foot or more.
- Put it where you will actually go to empty it. A unit buried behind stored boxes gets neglected.
Who has central vacuums
Central vacuums are common in larger homes and in regions where builders include the rough-in as a standard feature. They are especially popular in Canada and in parts of the United States where new construction routinely includes pipe in the walls. Many homes already have the pipe and inlets but have a dead or missing power unit. If that is your house, you are in the easiest position of all: read replacing an old unit rather than the buying guide.
People who choose to add one after the fact usually fall into three groups: households with pets or allergies who want the exhaust out of the living space, owners of multi-story homes tired of carrying a vacuum up and down stairs, and people who simply want a quieter house while cleaning.
How a central vacuum compares to portable vacuums
The comparison below is about categories, not specific models. A good cordless can beat a bad central vacuum on a single room. But the categories differ in predictable ways.
| Central vacuum | Upright | Canister | Cordless stick | |
|---|---|---|---|---|
| Noise in the room | Low: motor is in the garage or basement | High | Moderate to high | Moderate |
| Exhaust in the room | None if vented outside; filtered at the unit otherwise | Yes, filtered | Yes, filtered | Yes, filtered |
| Weight you carry | Hose, wand, and head only | Whole machine | Canister drags behind you | Light machine |
| Dirt capacity | Large canister, emptied a few times a year | Bin or bag, emptied every few uses | Bin or bag, emptied every few uses | Small bin, emptied every use |
| Suction with a long hose | Designed for it | Not applicable | Limited | Not applicable |
| Run time | Unlimited | Unlimited | Unlimited | Battery limited |
| Typical life | Pipe lasts the life of the house; unit commonly 15 to 25 years with a motor replacement | Several years | Several years | Several years, battery sooner |
| Install required | Yes | No | No | No |
| Reach between inlets | Hose length, usually 30 to 50 ft | Cord length | Cord length | Battery |
The honest version of this table: a central vacuum wins on noise, exhaust, carried weight, capacity, and lifespan. It loses on install cost, install disruption, and the hassle of a long hose. Whether that trade works in your favor depends on your house and how long you plan to live in it; are central vacuums worth it goes through that decision.
What a central vacuum does not do
It does not clean by itself; it is not a robot. It does not come with everything you need in one box unless the listing says “kit” and you read the contents carefully. Most power units are sold alone, and the hose, powerhead, and tools are a separate purchase. And it does not fix a bad floor plan: an inlet placed in a far corner instead of a hallway means a hose that never quite reaches.
Terms you will see
- Power unit: the motor and canister. Some brands say “main unit” or “central unit.”
- Inlet or inlet valve: the wall port. Not an outlet.
- Low-voltage inlet: an inlet with two small contacts that start the unit when the hose is inserted.
- Direct-connect electric inlet: an inlet that also carries 120V for a powerhead.
- Pigtail hose: a hose with a short power cord that plugs into a regular wall outlet to power the powerhead.
- Powerhead: a carpet head with an electric brush motor. An air-driven turbine head spins its brush with suction alone.
- Air watts: the standard measure of vacuum power. See air watts explained.
- Sweep inlet: a baseboard-level inlet you sweep dirt into with a broom. VacPan is NuTone’s brand name for it.
What to do next
If your home already has pipe in the walls, go straight to replacing an old unit. If you are deciding whether to install one, read how central vacuums work to understand what you are buying, then the buying guide for the decision order. If you want a quick answer on size, run the system sizer.
Frequently asked questions
Is a central vacuum the same as a built-in vacuum?
Yes. Built-in vacuum, whole-house vacuum, ducted vacuum, and central vacuum all describe the same thing: a fixed power unit connected by pipe to inlets in the walls. Some brands prefer one term over another, but the systems work the same way.
Do you need a special house for a central vacuum?
No, but you need a path for 2-inch pipe from the power unit to each inlet. New construction is easiest. Existing homes with a basement, crawlspace, or attic can usually be retrofitted. Slab homes with finished walls and no attic access are the hard case.
Where does the dirt go in a central vacuum?
Into the canister on the power unit. Depending on the model, it collects in a disposable bag, a permanent cloth filter bag, or a bagless bin you empty. The exhaust air either leaves through a vent pipe to outdoors or passes through a filter and exits at the unit.
Can you use a central vacuum on hardwood and carpet?
Yes. The hose and tools determine what you can clean. A bare-floor brush handles wood and tile, and a powerhead or air-driven turbine head handles carpet. Most systems are sold with a tool kit that covers both.
How many inlets does a house need?
Enough that a hose plugged into any inlet reaches every corner of the floor it serves, with some overlap. With a 30-foot hose, most homes need one inlet for every 600 to 800 square feet of floor space, placed in hallways or central rooms rather than in corners. Our sizing guide walks through the method.
Is a central vacuum loud?
The power unit is loud where it sits, roughly like a shop vacuum, but it is in the garage or basement. In the room you are cleaning you hear only air moving through the hose and the powerhead brush. Many owners can vacuum while someone sleeps or watches TV in the next room.