Ductless mini-split replacement: scope, costs, and what to ask

What replacement should address

Have the provider explain whether the project replaces one indoor unit or a coordinated indoor/outdoor system. Request compatibility documentation for retained equipment and controls. Confirm the rooms served, line and drainage reuse, wall repair, removal, and startup checks before comparing a partial replacement with a whole-system proposal.

Understand the system being assessed

Ductless equipment distributes heating or cooling through indoor units. The number and placement of those units define which areas the system is intended to serve.

U.S. Department of Energy — Heat pump systems · Source checked 2026-09-06

Useful details to gather before the visit

You do not need to diagnose the equipment. Record the observations you can make without opening panels or accessing unsafe areas.

• How many indoor units are installed, and which are affected?
• Are remote controls showing the same mode or an error?
• Which rooms need conditioning when their doors are closed?

Have the model, approximate age, prior service findings, and warranty documents ready if available. Describe recent changes to the home and your goal for the visit.

Compare the whole replacement project

List every component being replaced and every component retained. Ask why the proposed scope addresses the original problem, what site work it requires, and which warranties apply. When repair remains an option, get a separate repair assessment so you can compare timing, out-of-pocket cost, and remaining uncertainty.

What affects the price for this project?

Ask for indoor-unit count and models, outdoor equipment, line routing, drain routing or pumps, electrical work, wall finishing, and controls. Compare the rooms served by each proposal; one head for an addition is a different scope from whole-home installation.

Temperaly does not set provider prices. Ask for the charge for the proposed scope and a written explanation of exclusions. A useful quote separates required work from optional improvements so you can compare offers for the same result.

An example of a question worth resolving

A living-room indoor unit does not answer how a closed bedroom will be conditioned. Ask for the proposed delivery plan for that bedroom before comparing a one-head price with a multiroom design.

Use the example to frame your questions, not to diagnose your home. Ask the provider what evidence supports their recommendation and how they will verify the result.

Choose your next step

Review the scope, price, timing, and warranty before authorizing work. Start a ductless mini-split replacement request with your service city and state and what you need help with. A request does not reserve an appointment.

For a broader equipment decision, read repair versus replacement. For a current loss of comfort, see AC not cooling or no heat.