What is actually in the number
A mini split quote bundles at least five separate costs. When two quotes differ, it is almost always because they made different assumptions about one of these — not because one contractor is cheating you.
- Equipment. The condenser and indoor head(s). This is the part you can price yourself — every model page here lists the systems we track, and the spread between a budget and a premium unit of the same capacity is large.
- Line set and refrigerant. Distance matters. Most systems have a maximum line length per zone, and long runs may need additional refrigerant charged on site.
- Electrical. Nearly every system needs its own circuit. If your panel has a free slot and the run is short, this is modest. If the panel is full or needs upgrading, it can rival the cost of the equipment.
- Mounting and penetration. A ground-level wall behind the room is the easy case. Second storey, brick, or a long interior chase is not.
- Labour, permit and commissioning. Evacuation, pressure test, startup, and in most places a permit and inspection.
If a quote is a single number with no breakdown, ask for one. A contractor who will not itemise is not necessarily dishonest, but you cannot compare a bundled number against anything.
The four things that actually move the price
1. Line-set distance
The further the outdoor unit sits from the indoor head, the more line set, the more labour, and potentially more refrigerant. Systems publish a maximum line length per zone, and going near that limit is not free.
What to do: decide where the condenser goes before you collect quotes, and tell every contractor the same location. Two quotes that assume different condenser positions are not comparable.
2. Your electrical panel
This is the most common reason a quote comes in far higher than expected, and it has nothing to do with the mini split. A full panel, an old service, or a long run from panel to condenser can each add real money.
What to do: look at your panel before anyone visits. Count the free breaker slots and note the service size on the main breaker. Most of our model pages publish the minimum circuit ampacity and maximum breaker size for the system, so you can tell a contractor exactly what the unit draws before anyone guesses.
A note for anyone considering a DIY unit: a quick-connect system removes the refrigerant work, not the electrical work. Only the 115V units genuinely avoid new circuit work in most homes — a 230V system needs a dedicated circuit run by an electrician regardless of how the line set connects. See what "DIY mini split" actually means.
3. Single-zone versus multi-zone
A multi-zone system is not simply several single-zone systems. One condenser serves several heads, each with its own line set back to the outdoor unit, and the head combination has to be compatible with that condenser. More line runs, more penetrations, more commissioning.
What to do: if you are quoting a multi-zone, confirm the exact head combination. Our multi-zone head compatibility guide covers which heads a given condenser supports — a quote built on an incompatible combination will change later, and that is the change that hurts.
4. Access and finish
Height, wall material, interior chases, and how much drywall gets opened and closed. This is where two honest contractors most often differ, because they are pricing different amounts of risk.
Reading two quotes side by side
Line them up on these, in this order:
- Same equipment? Compare model numbers, not brand names. Capacity and efficiency vary widely within a brand.
- Same condenser location and line-set length?
- Who is doing the electrical, and is a panel upgrade included, excluded, or unmentioned? "Unmentioned" is the one to chase.
- Is the permit included? Some quotes exclude it and some jurisdictions require it. See do you need a permit for a mini split.
- What warranty applies, and does self-supplying the equipment affect it? Buying online can change your warranty.
Warning signs
- No itemisation, and refusal to provide one.
- A quote that does not name the exact model. You cannot verify efficiency, capacity or warranty against a brand name alone.
- Electrical left vague. It is the single largest source of change orders.
- A multi-zone quote with no head list.
- Pressure to decide today. Equipment pricing does not move that fast.
What a fair quote looks like
Itemised, names exact model numbers, states the condenser location and approximate line-set length, says explicitly who handles the electrical and whether a panel upgrade is included, and covers permit and commissioning. It does not have to be the cheapest. It has to be the one you can check.
Get a realistic number first
Before you talk to anyone, run the installation cost estimator so you walk in with a range rather than a blank sheet. Then compare the quotes you receive against it — not to argue a contractor down, but to know which questions are worth asking.
If you would rather have installers come to you, we can match you with local contractors and you can compare their quotes using the checklist above.