A central vacuum installer sells you a design, not just a unit on a wall. The questions below are grouped so you can work through a site visit in order: the installer’s experience, the design for your house, the parts they propose, the wiring, the warranty, and how the price is built up. Ask them all; a good installer will have answered half of them before you ask. Then use the checklist at the end to compare quotes line by line rather than by total.
Experience
1. How many central vacuum systems have you installed, and how many in homes like mine? A retrofit in a slab home with finished walls is a different job from a rough-in in open framing. You want someone who has done your kind of house.
2. Do you install central vacuums as your main work, or alongside other trades? Installers who do this all day know the routing tricks and the inlet standards. Generalists may not. Either can do good work; you want to know which you are hiring.
3. Which brands do you install and service, and are you an authorized dealer for any of them? This tells you what you will be offered and whether the manufacturer’s full warranty will apply. It also tells you who you will call in year eight.
4. Can you give me two recent customers with a similar house to call? Ask them whether the far inlets have strong suction and whether the installer came back for anything.
Design
5. Where will the power unit go, and why there? The answer should consider noise, exhaust path to the outdoors, clearance to empty the bin, the nearest outlet or circuit, and temperature. “Wherever the pipe comes out” is not a design.
6. Can you mark the inlet locations and the pipe route on my floor plan? This is the heart of the quote. Inlets belong in hallways and central rooms with reach circles that cover every corner; see planning inlet locations. The pipe route tells you where walls or ceilings will be opened.
7. What hose length is the design based on, and what is the longest pipe run to the farthest inlet? If the design assumes a 35 ft hose, you need to buy a 35 ft hose. The longest run plus hose length is what sizes the unit; the installer should know it. Sizing explains why.
8. How did you size the unit, and what air watts and water lift does it have? Listen for the pipe run, not just the square footage. Ask them to show you the spec sheet; air watts explained covers how to read it.
9. Where will the exhaust go, and will it be vented outdoors? Outdoor venting is required for filterless units and the best filtration for all others. If they propose venting into the garage, ask why.
10. What will need to be cut, patched, and painted, and who does the patching? Retrofit means holes. Know where and know whether finishing is included.
Parts
11. Exactly which unit model, hose, powerhead, wand, and tools are in the quote? Model numbers, not descriptions. A “deluxe electric kit” tells you nothing; a hose length, hose type, and powerhead model do. Attachments and tools explained lists what a complete kit contains.
12. Which inlet type are you installing, and how does it match the hose you quoted? Low-voltage inlets with a pigtail hose, or direct-connect electric inlets with a direct-connect hose in the matching brand family. If the answer is vague, the hose may not fit. Identify your inlet type explains the families.
13. Is the pipe standard 2-inch central vacuum pipe with long-sweep fittings? It should be. Plumbing PVC and tight elbows are where clogs and leaks start.
14. Are bags, filters, and a replacement motor for this unit readily available, and from where? You will need them in year 3 and year 12. Bags and filters and motors cover what to look for.
Wiring
15. Who does the 120V work, and are they a licensed electrician? Direct-connect electric inlets, a dedicated circuit, or a hardwired unit are line-voltage work. A licensed electrician does it, and it may need a permit. Low-voltage wiring for the inlets is not line voltage and a central vacuum installer handles it.
16. Will the unit plug into an existing outlet or need a new circuit, and is that included? Dual-motor units often need a dedicated circuit. Find out whether the electrical work is in the quote or a separate bill from a separate trade.
Warranty
17. What is the manufacturer’s warranty on the motor and on the unit, and does my installation qualify for it? Some warranties require an authorized dealer. Get the terms in writing with the quote.
18. What is your warranty on the installation itself, and what does a callback cost? Leaks at fittings, an inlet that does not start the unit, and weak suction upstairs are installation issues that show up in the first weeks. Know who fixes them and for how long.
Price structure
You are not comparing totals; you are comparing scopes. Ask the installer to break the quote into these lines so the structure is visible, and ask the three questions below. We do not list figures, because they vary by region and change often; the structure is what you can compare.
What is itemized and what is bundled? A quote that bundles “system and installation” into one number cannot be compared with one that itemizes. Ask for the breakdown.
What would change the price after you start? Hidden framing, a route that does not work, extra elbows, a longer exhaust run. A good installer names the likely surprises and how they are priced.
What is not included? Patching, paint, permits, electrical, the hose hanger, the first box of bags. Each is small; together they are the difference between two quotes.
Quote comparison checklist
Put each quote in a column and fill in the rows. Blank cells are questions to go back with.
| Line item | Quote A | Quote B | Quote C | What to check |
|---|---|---|---|---|
| Power unit model | Same class? Air watts and water lift listed? | |||
| Collection method | Bagged, bagless, hybrid; vented outdoors? | |||
| Motor type and count | Bypass? Single or dual? | |||
| Number of inlets | Same count? Locations marked on plan? | |||
| Inlet type | Low-voltage or direct-connect; matches the hose? | |||
| Hose type and length | Matches the inlet type and the design reach? | |||
| Powerhead or turbine head | Model named? Electric needs an electric hose | |||
| Wand and tools | Listed individually? | |||
| Hose hanger, sock, caddy | Included or extra? | |||
| Pipe and fittings | 2-inch central vacuum pipe, long-sweep fittings | |||
| Low-voltage wiring | Included | |||
| Exhaust run and vent cap | Outdoors? Muffler included? | |||
| 120V electrical work | Who, licensed, permit, included or separate | |||
| Cutting, patching, paint | Included or homeowner’s job | |||
| Permits | Needed? Who pulls them? | |||
| Labor and schedule | Days on site; what extends it | |||
| Manufacturer warranty: motor | Years; valid for this installation? | |||
| Manufacturer warranty: unit | Years | |||
| Installer warranty on labor | Length; callback terms | |||
| Items excluded | Listed explicitly? | |||
| Price changes after start | Named and priced? |
Two quotes with the same rows filled in the same way are comparable on price. Two quotes where one has four inlets and a 30 ft hose and the other has six inlets and a 35 ft hose are different systems; decide which system you want first.
Before the installer arrives
- Have a floor plan or a sketch of each floor with room dimensions.
- Know where you would like the unit and where the electrical panel is.
- Know whether you have attic, basement, or crawlspace access, and clear the way to it.
- Decide whether carpet justifies an electric powerhead; it changes the inlet and hose decision.
- Read the buying guide so the installer’s proposals have context.
What to do next
Run the system sizer before the visit so you have an independent view of the unit class. Read hire an installer for how to find candidates, and cost to install for the variables that move installation cost in your type of house. Take this page’s checklist to each visit.
Frequently asked questions
How long does it take to install a central vacuum?
A retrofit in a home with attic or basement access is typically one to two days for a crew, depending on the number of inlets and floors. A new-construction rough-in is faster because the walls are open. Slab homes with finished walls and no attic access take longer and require creative routing. Ask the installer for a schedule and what could extend it.
Do I need a licensed electrician to install a central vacuum?
For the low-voltage wiring and the pipe, no; a central vacuum installer or a careful homeowner does that. For anything at 120V, which includes direct-connect electric inlets, a new dedicated circuit, or a hardwired unit, yes. Ask who on the crew does that work and whether they are licensed.
Should the installer supply the unit or should I buy it myself?
Either works, but check the warranty first. Some manufacturers require purchase and installation through an authorized dealer for the full warranty. If you buy online and the installer fits it, ask the installer whether they will warrant their work independently of the unit.
How many inlets should an installer recommend?
Enough that the hose you choose reaches every corner of every floor from at least one inlet, with some overlap, placed in hallways and central rooms rather than corners. Ask the installer to show the reach circles on your plan. Fewer inlets with a longer hose is a valid design; fewer inlets with the same hose is a shortcut.
What should a central vacuum quote include?
The unit model, the hose type and length, the carpet head and tools, the number and location of inlets, pipe and fittings, low-voltage wire, the exhaust run and vent, any electrical work, patching and paint, permits if needed, labor, and the warranty on labor. If any of these is missing, the quote is incomplete.
Can I get a central vacuum quote without a site visit?
You can get a rough range from a floor plan, but a real quote needs someone to look at the attic, basement, or crawlspace, find the pipe route, and check the electrical panel. Be wary of a firm quote that did not involve a visit; the surprises will be billed as extras.